This document describes the design and fabrication of flat helical nanosieve devices that can fully manipulate optical vortices. The nanosieves achieve complex control of optical vortex beams through spatially rotating nanovoids that introduce geometric phase shifts. This allows the generation, hybridization, spatial multiplexing, focusing and nondiffractive propagation of optical vortices to be controlled. Unlike conventional methods, the multifunctional flat helical nanosieves provide unique extensibility and flexibility for manipulating the orbital angular momentum of light within an ultrathin interface.
Time Domain Modelling of Optical Add-drop filter based on Microcavity Ring Re...iosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
GEOMETRY AND CHARACTERIZATION OF LOW INDEX SILICON MICRO RING RESONATORSoptljjournal
An optical ring resonator is indeed a series of waveguides in which a closed loop coupled with some sort of input and output of light is at least one. The consequence of the index difference on dielectric waveguide characteristics such as single-mode process, losses, efficiency of fiber to waveguide coupling, minimum bending radius, hybridity mode, birefringence, polarization effects, repeatability and stability, integration
size, realizable circuits, technical constraints and usable materials is indeed very significant for study. The purpose of this article is to analyze the effect of the features of the waveguide with regard to the index correlation and to explore the difficulties. This article assesses the effect of the intensity index on the characteristics of the dielectric waveguide, such as the single-mode device, losses, technical constraints and materials available. This work is an approximation for the design of optical waveguides, so that by lowering the silicon index, we can achieve versatility
In general, analysing cameras is a difficult problem and solutions are often found only for geometric
approach. In this paper, the image capturing capability of a camera is presented from optical perspective.
Since most compact cameras can acquire only visible light, the description and propagation method of the
visible part of the electromagnetic spectrum reflected by a scene object is made based on Maxwell’s
equations. We then seek to use this understanding in the modelling of the image formation process of the
camera. The dependency of camera sensor field distribution on aperture dimension is emphasized. This
modelling leads to an important camera and image quality parameter called Modulation Transfer
Function. The model presented is based on a wave optics in which the wavefront is modified by the lens
after diffraction has taken place at the camera rectangular aperture positioned at the front focal point of
the lens. Simulation results are presented to validate the approach.
Wave Optics Analysis of Camera Image Formation With Respect to Rectangular Ap...IJCSEA Journal
In general, analysing cameras is a difficult problem and solutions are often found only for geometric approach. In this paper, the image capturing capability of a camera is presented from optical perspective. Since most compact cameras can acquire only visible light, the description and propagation method of the visible part of the electromagnetic spectrum reflected by a scene object is made based on Maxwell’s equations. We then seek to use this understanding in the modelling of the image formation process of the camera. The dependency of camera sensor field distribution on aperture dimension is emphasized. This modelling leads to an important camera and image quality parameter called Modulation Transfer Function. The model presented is based on a wave optics in which the wavefront is modified by the lens after diffraction has taken place at the camera rectangular aperture positioned at the front focal point of the lens. Simulation results are presented to validate the approach.
Development and Performance Enhancement of MEMS Helix Antenna for THz Applica...TELKOMNIKA JOURNAL
Interest of Micro-Electromechanical System (MEMS) antennas in Terahertz (THz) applications
has rapidly expanded in recent years due to the advent of accurate Computer Aided Design (CAD) tools.
The very special needs of newly proposed MEMS antennas, especially with a wide bandwidth range,
require advanced optimization procedures of enhancing already established designs. This paper provides
a compact design of a wideband MEMS helix antenna optimized using tree-dimensional High Frequency
Structure Simulator (3D-HFSS) based on Quasi-Newton (Q-N) and Sequential Non Linear Programming
(SNLP) techniques to modify the antenna structure with a high accuracy for the selective band of
frequencies by training the samples and minimizing the error from Finite Element Method- (FEM) based
simulation tool. The helix antenna is presented using MEMS technology and shows high performance
demonstrated by very low return losses of less than -20 to -65 dB for a wide range of frequencies from 2.5
to 5 THz. High antenna geometry precision and efficient performance are finally achieved by rectifying and
synthesizing various tunable parameters embedded in silicon substrate including both helix form and
feeding line parameters.
Time Domain Modelling of Optical Add-drop filter based on Microcavity Ring Re...iosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
GEOMETRY AND CHARACTERIZATION OF LOW INDEX SILICON MICRO RING RESONATORSoptljjournal
An optical ring resonator is indeed a series of waveguides in which a closed loop coupled with some sort of input and output of light is at least one. The consequence of the index difference on dielectric waveguide characteristics such as single-mode process, losses, efficiency of fiber to waveguide coupling, minimum bending radius, hybridity mode, birefringence, polarization effects, repeatability and stability, integration
size, realizable circuits, technical constraints and usable materials is indeed very significant for study. The purpose of this article is to analyze the effect of the features of the waveguide with regard to the index correlation and to explore the difficulties. This article assesses the effect of the intensity index on the characteristics of the dielectric waveguide, such as the single-mode device, losses, technical constraints and materials available. This work is an approximation for the design of optical waveguides, so that by lowering the silicon index, we can achieve versatility
In general, analysing cameras is a difficult problem and solutions are often found only for geometric
approach. In this paper, the image capturing capability of a camera is presented from optical perspective.
Since most compact cameras can acquire only visible light, the description and propagation method of the
visible part of the electromagnetic spectrum reflected by a scene object is made based on Maxwell’s
equations. We then seek to use this understanding in the modelling of the image formation process of the
camera. The dependency of camera sensor field distribution on aperture dimension is emphasized. This
modelling leads to an important camera and image quality parameter called Modulation Transfer
Function. The model presented is based on a wave optics in which the wavefront is modified by the lens
after diffraction has taken place at the camera rectangular aperture positioned at the front focal point of
the lens. Simulation results are presented to validate the approach.
Wave Optics Analysis of Camera Image Formation With Respect to Rectangular Ap...IJCSEA Journal
In general, analysing cameras is a difficult problem and solutions are often found only for geometric approach. In this paper, the image capturing capability of a camera is presented from optical perspective. Since most compact cameras can acquire only visible light, the description and propagation method of the visible part of the electromagnetic spectrum reflected by a scene object is made based on Maxwell’s equations. We then seek to use this understanding in the modelling of the image formation process of the camera. The dependency of camera sensor field distribution on aperture dimension is emphasized. This modelling leads to an important camera and image quality parameter called Modulation Transfer Function. The model presented is based on a wave optics in which the wavefront is modified by the lens after diffraction has taken place at the camera rectangular aperture positioned at the front focal point of the lens. Simulation results are presented to validate the approach.
Development and Performance Enhancement of MEMS Helix Antenna for THz Applica...TELKOMNIKA JOURNAL
Interest of Micro-Electromechanical System (MEMS) antennas in Terahertz (THz) applications
has rapidly expanded in recent years due to the advent of accurate Computer Aided Design (CAD) tools.
The very special needs of newly proposed MEMS antennas, especially with a wide bandwidth range,
require advanced optimization procedures of enhancing already established designs. This paper provides
a compact design of a wideband MEMS helix antenna optimized using tree-dimensional High Frequency
Structure Simulator (3D-HFSS) based on Quasi-Newton (Q-N) and Sequential Non Linear Programming
(SNLP) techniques to modify the antenna structure with a high accuracy for the selective band of
frequencies by training the samples and minimizing the error from Finite Element Method- (FEM) based
simulation tool. The helix antenna is presented using MEMS technology and shows high performance
demonstrated by very low return losses of less than -20 to -65 dB for a wide range of frequencies from 2.5
to 5 THz. High antenna geometry precision and efficient performance are finally achieved by rectifying and
synthesizing various tunable parameters embedded in silicon substrate including both helix form and
feeding line parameters.
Reduction of Mutual Coupling between Closely Spaced Microstrip Antennas Array...TELKOMNIKA JOURNAL
Reducing mutual coupling is a key research area in design of compact microstrip antennas
arrays. To minimize the overall size of the antennas arrays, the distance between them must be very
small, as a result a strong mutual coupling is appears. Periodic structures can help to design a low profile
of antennas arrays and enable to improve their performances by the suppression of surface waves
propagation in a given frequency range. This paper proposes a novel configuration of mushroom-like
electromagnetic band-gap (2D-EBG) structure created by microstrip technology placed between two
antennas arrays to reduce the mutual coupling more than -33.24dB. When 13×2 EBG structures are used,
the mutual coupling reduces to -59.36dB at the operation frequency 5.8GHz of the antennas arrays. A
26.12dB mutual coupling reduction is achieved, which proves that the surface wave is suppressed. The
proposed configuration is designed, optimized, and miniaturized by using electromagnetic software CST
Microwave Studio. The measured results show that there is a good agreement with the computed results.
Neutron Imaging and Tomography with Medipix2 and Dental Microroentgenography:...IJAEMSJORNAL
An over view of Neutron Imaging and Tomography (NIT) with Medipix2 and Dental Micro-roentgenography have been presented in this article. This over view confined to semiconductor detector Medipix2, neutron radiography and tomography and dental microroentgenography. Medipix2 is a pixel-based detector technology employed to measure charge particles, photons (visible through gammas) and neutron. Neutron Beam for this technology are LVR-15 Research Reactor ( 107 n/cm2 s) and Spallation neutron source ( 3×106n/cm2 s) .This technology has been verified with photograph and neutronogram of a relay and photograph and tomographic 3D reconstruction of a bullet cartidge, tooth and fishing thread. Comparison of spatial resolution among different imagers also has been presented.
III-Nitride Semiconductors based Optical Power Splitter Device Design for und...IJECEIAES
In this paper, we introduce III-nitrides based 1× 4 optical power splitter for underwater optical communication applications. To the best of our knowledge, this is a first study for the design of multimode interference (MMI) and four-branch taper waveguide based on GaN/sapphire. The microstructure of GaN semiconductor grown by Metalorganic Chemical Vapor Deposition (MOCVD) on (0001) sapphire reported. The numerical experimental is conducted using the 3D FD-BPM method. The results showed that the optical power splitter has an excess loss of 0.013 dB and imbalance of 0.17 dB. The results open the opportunity for the future device using this technology for the underwater application.
Improving Splitting Efficiency in Photonic Crystal WaveguideIJERA Editor
“Photonic Crystals (PCs)” are dielectric structures with periodic spatial alternations of refractive index on the
scale of the wavelength of light. Many optical devices, based on PCs, have been proposed. There are
multiple ways by which equal amount of power of incoming signals can be divided into two, three and
four output channels; for example using multiple coupled photonic crystal waveguides, directional coupling and
cascaded multimode PC waveguides. Ideally, the splitter should divide the input power equally into the output
channels without significant reflection or radiation losses and should be compact in size. In this thesis I
have proposed the optical power splitting using Y-junction. The optical modeling of this proposed structure
was investigated by finite difference time domain (FDTD) simulation. The goal was to achieve equal power at
each output channel with broad spectrum around the target wavelength with low loss.
ARRAY FACTOR IN CURVED MICROSTRIPLINE ARRAY ANTENNA FOR RADAR COMMUNICATION S...jantjournal
This paper presents the designed of varians array in curved microstripline antenna for radar communication. The antenna geometry comprises of three varians in matrics 2x2, 2x4 and 4x4 dimensions. The several array operates in C-Band frequencies (4GHz – 8GHz) and X-Band frequencies (8GHz-12GHz) with a 1.82 VSWR, -18.72dB Return loss, 0.29 reflection coefficient, and 5.8dB gain for 2x2 array, 1.64 VSWR, -16.17dB Return loss, 0.24 reflection coefficient, and 5.4dB gain for 2x4 array, 1.04 VSWR, - 37.70dB Return loss, 0.19 reflection coefficient, and 7.6dB gain for 4x4 array. All of the varians in array elements are feed using a direct feeding technique. This array antenna is suitable developed for use in radar communication systems.
Analysis of Metamaterial Based Microstrip Array Antennaijceronline
Metamaterials have been intensively researched due to their peculiar features such as negative permittivity and/or permeability and ultra-refraction phenomenon. To satisfy the demand of commonly used wireless communication systems, an antenna which can operate at higher frequencies and enhanced characteristics are desirable. The arrangement of all elements is done that they provide an improvement in bandwidth, directivity return loss etc. The frequency response of a metamaterial can be tailored by varying its characteristics. A new metamaterial structure using square and ring split ring resonator is proposed. Using this metamaterial structure, a microstrip patch antenna is designed with enhanced characteristics such as reduction in return lossfrom-20dB to -36dB with tunability is achieved.
Smart Platform Infrastructure with AWSJames Huston
Learn from some of our insights and create a smart infrastructure that let's your team sleep at night!
Presented @DevOpsDays_CLT Feb 2017 by James Huston @hustonjs
Developing Leaders at all levels through Purpose driven coachingJoseph Abraham
Organizations often state that they want to strengthen their leadership pipeline, yet research shows that corporate leadership capabilities are dropping. These days, every organization is competing with everyone, from everywhere for everything - a new global reality! Researchers at Boston Consulting Group have identified the need to build leaders at all levels in an organization as one of the main challenges to be successful in the modern 'flat' world. To be successful in the turbulent decade that lies ahead leaders – and all the people they lead – need to learn to deal with complexity, uncertainty and constant change
In today’s work and organizational context one of the key qualities that helps leaders succeed and develop more leaders is the ability to coach, this workshop aims to help understand the essence of coaching and the effective tools one can practically employ at workplace both with individuals and teams that can make your coaching interventions more meaningful and powerful.
Your people have an innate desire to succeed and perform to their best and sometimes with the mind blocks and blind-spots they feel they’ve come to cross-roads or stumbled upon a huge roadblock and as a leader and you too want to see them thrive, succeed and grow, now with coaching you can help them accomplish their goals as Coaching is all about the person at the other end of the conversation, making this conversation powerful, engaging, lively, trust-driven and worthwhile is the key, and that’s what we’ll discover through this presentation.
Purpose Driven Leadership-The Solution to Global Problems
In this talk that I presented at the Rotary Club of London, I shared why activating purpose and shared values in each leader and employee is the key to driving positive social economic changes that are needed globally.
I also shared why Purpose-Led Leadership is the key to the global transformations needed to resolve some of the world greatest problems we face today. How by aligning our inner being, quieting the mind, balancing our perceptions and emotions we can lead purposefully and drive the changes needed to better our future and look after our planet.
The world doesn’t need more power-driven leaders, but purpose-driven leaders who can solve real-world issues. The key challenge for businesses globally is how to get more purpose-driven leaders that realise they are there to make a difference in the world, to be the compass that direct company towards a desired outcome that is purpose driven.
The pressures are greater today than they’ve ever been on CEOs to produce short-term results but it’s really not about that. It’ about having a company that’s going to solve actual social problems through the work the company does and that requires a company with commitment to purpose throughout the entire organisation.
In a highly globalised world we live in today facing numerous challenges, purpose is what unites people to work towards a common future. To have purpose is to give meaning to the goals we are striving to achieve together. Purposeful and meaningful work is becoming more and more important worldwide. According to Youth Speak, the global millennial insight survey, young people rated meaningful work as the 2nd most important factor in the first 5 years of their career.
In business, I learned from many mistakes that I made that the aim is to do business with people who believe what you believe.
Abraham Maslow had it right. Once our physical needs are met, we long for love, belonging, esteem and finally what Maslow called “self-actualization”–that our lives count.
To learn more about how to activate purpose in leadership and in people grab your copies of A Path to Wisdom and #Loneliness and start learning about TJS Evolutionary Method and apply daily some of key universal principles shared in the books.
For more information about how my talks, seminars, and workshop can help you or your organizations please visit www.tonyselimi.com
Love and Wisdom
Tony J. Selimi
Human Behaviour and Cognition Expert
Reduction of Mutual Coupling between Closely Spaced Microstrip Antennas Array...TELKOMNIKA JOURNAL
Reducing mutual coupling is a key research area in design of compact microstrip antennas
arrays. To minimize the overall size of the antennas arrays, the distance between them must be very
small, as a result a strong mutual coupling is appears. Periodic structures can help to design a low profile
of antennas arrays and enable to improve their performances by the suppression of surface waves
propagation in a given frequency range. This paper proposes a novel configuration of mushroom-like
electromagnetic band-gap (2D-EBG) structure created by microstrip technology placed between two
antennas arrays to reduce the mutual coupling more than -33.24dB. When 13×2 EBG structures are used,
the mutual coupling reduces to -59.36dB at the operation frequency 5.8GHz of the antennas arrays. A
26.12dB mutual coupling reduction is achieved, which proves that the surface wave is suppressed. The
proposed configuration is designed, optimized, and miniaturized by using electromagnetic software CST
Microwave Studio. The measured results show that there is a good agreement with the computed results.
Neutron Imaging and Tomography with Medipix2 and Dental Microroentgenography:...IJAEMSJORNAL
An over view of Neutron Imaging and Tomography (NIT) with Medipix2 and Dental Micro-roentgenography have been presented in this article. This over view confined to semiconductor detector Medipix2, neutron radiography and tomography and dental microroentgenography. Medipix2 is a pixel-based detector technology employed to measure charge particles, photons (visible through gammas) and neutron. Neutron Beam for this technology are LVR-15 Research Reactor ( 107 n/cm2 s) and Spallation neutron source ( 3×106n/cm2 s) .This technology has been verified with photograph and neutronogram of a relay and photograph and tomographic 3D reconstruction of a bullet cartidge, tooth and fishing thread. Comparison of spatial resolution among different imagers also has been presented.
III-Nitride Semiconductors based Optical Power Splitter Device Design for und...IJECEIAES
In this paper, we introduce III-nitrides based 1× 4 optical power splitter for underwater optical communication applications. To the best of our knowledge, this is a first study for the design of multimode interference (MMI) and four-branch taper waveguide based on GaN/sapphire. The microstructure of GaN semiconductor grown by Metalorganic Chemical Vapor Deposition (MOCVD) on (0001) sapphire reported. The numerical experimental is conducted using the 3D FD-BPM method. The results showed that the optical power splitter has an excess loss of 0.013 dB and imbalance of 0.17 dB. The results open the opportunity for the future device using this technology for the underwater application.
Improving Splitting Efficiency in Photonic Crystal WaveguideIJERA Editor
“Photonic Crystals (PCs)” are dielectric structures with periodic spatial alternations of refractive index on the
scale of the wavelength of light. Many optical devices, based on PCs, have been proposed. There are
multiple ways by which equal amount of power of incoming signals can be divided into two, three and
four output channels; for example using multiple coupled photonic crystal waveguides, directional coupling and
cascaded multimode PC waveguides. Ideally, the splitter should divide the input power equally into the output
channels without significant reflection or radiation losses and should be compact in size. In this thesis I
have proposed the optical power splitting using Y-junction. The optical modeling of this proposed structure
was investigated by finite difference time domain (FDTD) simulation. The goal was to achieve equal power at
each output channel with broad spectrum around the target wavelength with low loss.
ARRAY FACTOR IN CURVED MICROSTRIPLINE ARRAY ANTENNA FOR RADAR COMMUNICATION S...jantjournal
This paper presents the designed of varians array in curved microstripline antenna for radar communication. The antenna geometry comprises of three varians in matrics 2x2, 2x4 and 4x4 dimensions. The several array operates in C-Band frequencies (4GHz – 8GHz) and X-Band frequencies (8GHz-12GHz) with a 1.82 VSWR, -18.72dB Return loss, 0.29 reflection coefficient, and 5.8dB gain for 2x2 array, 1.64 VSWR, -16.17dB Return loss, 0.24 reflection coefficient, and 5.4dB gain for 2x4 array, 1.04 VSWR, - 37.70dB Return loss, 0.19 reflection coefficient, and 7.6dB gain for 4x4 array. All of the varians in array elements are feed using a direct feeding technique. This array antenna is suitable developed for use in radar communication systems.
Analysis of Metamaterial Based Microstrip Array Antennaijceronline
Metamaterials have been intensively researched due to their peculiar features such as negative permittivity and/or permeability and ultra-refraction phenomenon. To satisfy the demand of commonly used wireless communication systems, an antenna which can operate at higher frequencies and enhanced characteristics are desirable. The arrangement of all elements is done that they provide an improvement in bandwidth, directivity return loss etc. The frequency response of a metamaterial can be tailored by varying its characteristics. A new metamaterial structure using square and ring split ring resonator is proposed. Using this metamaterial structure, a microstrip patch antenna is designed with enhanced characteristics such as reduction in return lossfrom-20dB to -36dB with tunability is achieved.
Smart Platform Infrastructure with AWSJames Huston
Learn from some of our insights and create a smart infrastructure that let's your team sleep at night!
Presented @DevOpsDays_CLT Feb 2017 by James Huston @hustonjs
Developing Leaders at all levels through Purpose driven coachingJoseph Abraham
Organizations often state that they want to strengthen their leadership pipeline, yet research shows that corporate leadership capabilities are dropping. These days, every organization is competing with everyone, from everywhere for everything - a new global reality! Researchers at Boston Consulting Group have identified the need to build leaders at all levels in an organization as one of the main challenges to be successful in the modern 'flat' world. To be successful in the turbulent decade that lies ahead leaders – and all the people they lead – need to learn to deal with complexity, uncertainty and constant change
In today’s work and organizational context one of the key qualities that helps leaders succeed and develop more leaders is the ability to coach, this workshop aims to help understand the essence of coaching and the effective tools one can practically employ at workplace both with individuals and teams that can make your coaching interventions more meaningful and powerful.
Your people have an innate desire to succeed and perform to their best and sometimes with the mind blocks and blind-spots they feel they’ve come to cross-roads or stumbled upon a huge roadblock and as a leader and you too want to see them thrive, succeed and grow, now with coaching you can help them accomplish their goals as Coaching is all about the person at the other end of the conversation, making this conversation powerful, engaging, lively, trust-driven and worthwhile is the key, and that’s what we’ll discover through this presentation.
Purpose Driven Leadership-The Solution to Global Problems
In this talk that I presented at the Rotary Club of London, I shared why activating purpose and shared values in each leader and employee is the key to driving positive social economic changes that are needed globally.
I also shared why Purpose-Led Leadership is the key to the global transformations needed to resolve some of the world greatest problems we face today. How by aligning our inner being, quieting the mind, balancing our perceptions and emotions we can lead purposefully and drive the changes needed to better our future and look after our planet.
The world doesn’t need more power-driven leaders, but purpose-driven leaders who can solve real-world issues. The key challenge for businesses globally is how to get more purpose-driven leaders that realise they are there to make a difference in the world, to be the compass that direct company towards a desired outcome that is purpose driven.
The pressures are greater today than they’ve ever been on CEOs to produce short-term results but it’s really not about that. It’ about having a company that’s going to solve actual social problems through the work the company does and that requires a company with commitment to purpose throughout the entire organisation.
In a highly globalised world we live in today facing numerous challenges, purpose is what unites people to work towards a common future. To have purpose is to give meaning to the goals we are striving to achieve together. Purposeful and meaningful work is becoming more and more important worldwide. According to Youth Speak, the global millennial insight survey, young people rated meaningful work as the 2nd most important factor in the first 5 years of their career.
In business, I learned from many mistakes that I made that the aim is to do business with people who believe what you believe.
Abraham Maslow had it right. Once our physical needs are met, we long for love, belonging, esteem and finally what Maslow called “self-actualization”–that our lives count.
To learn more about how to activate purpose in leadership and in people grab your copies of A Path to Wisdom and #Loneliness and start learning about TJS Evolutionary Method and apply daily some of key universal principles shared in the books.
For more information about how my talks, seminars, and workshop can help you or your organizations please visit www.tonyselimi.com
Love and Wisdom
Tony J. Selimi
Human Behaviour and Cognition Expert
Are you focused on a career transition? Are you stuck in finding new job leads? Do you know what your top five skills are? Do you want to understand how to lead with with your strengths and values? If your answer to all of the questions above is yes this presentation is for you?
Singapore Airlines; Internet and Electronic Marketing ProjectVaneet Sood
Its a detailed project to analyze and study Singapore Airlines website and its effort to increase its UI for customers. From the study it can easily be concluded that its Website aids various uses including Marketing and Promoting besides e-commerce and ticket booking.
Resonance frequency analysis of laser optical fiber based on microcantileverIJECEIAES
The normal frequency of smart beams was originated utilizing FEM [Ansys and Comsol] code for first five modes by varying the position of actuator from the fixed end of the structure, and it has a suitable arrangement with analytically found the standard frequency. This paper includes learning a resonance frequency analysis of laser optical fiber based on microcantilever of designing magnetic actuator using Ansys and Comsol simulation. The design of optical fiber includes Nickel cantilever, two magnets and one coil that apply to force on the cantilever. After the current flows in the coil domain, the shape of microcantilever will be deformed. It will move to z- direction that depends on the force direction. Two methods including, Comsol Multiphysics, Ansys and analytical equations have been utilized to calculate the resonance frequency, current and force values. The simulation results include calculating the current (magnetic current density) and effects of the magnetic field of the coil on the cantilever (force calculation). Utilizing this method is to limit faults(errors) of optical fiber laser between transmitter and receiver system (detection system) for any time of cutting coil when the signal of a laser passes through the coil. In conculsions, resonant frequency (f_n) tuning using cantilivier presented in the resrach have larger variable range by using simulations. However,the adjusting of the system and changing the deminsions.Resolutions to this problematic contain tuning the modes of resonant frequency to produce by cantilivier with 2-magnets and coil when the signal pass from laser source. Based on these simulations and characterization results, the proposed assembly can be a good applicant for evolving a low price, high material platform for many biological, laser optical fiber, communication, machine learning, biosensors and biomedical applications.
MODELING STUDY OF LASER BEAM SCATTERING BY DEFECTS ON SEMICONDUCTOR WAFERSjmicro
Accurate modeling of light scattering from nanometer scale defects on Silicon wafersiscritical for enabling
increasingly shrinking semiconductor technology nodes of the future. Yet, such modeling of defect
scattering remains unsolved since existing modeling techniques fail to account for complex defect and
wafer geometries. Here, we present results of laser beam scattering from spherical and ellipsoidal
particles located on the surface of a silicon wafer. A commercially available electromagnetic field solver
(HFSS) was deployed on a multiprocessor cluster to obtain results with previously unknown accuracy
down to light scattering intensity of -170 dB. We compute three dimensional scattering patterns of silicon
nanospheres located on a semiconductor wafer for both perpendicular and parallel polarization and show
the effect of sphere size on scattering. We further computer scattering patterns of nanometer scale
ellipsoidal particles having different orientation angles and unveil the effects of ellipsoidal orientation on
scattering.
Abc pso optimization technique for parameter optimization in circular log per...eSAT Journals
Abstract
It is applicable to note that, in the overall wireless communication mechanism, the role played by the antenna is beyond the realm of words. In fact, the deployment of the antenna the wireless network faces the grave challenges of the communication of the high speed signals. Of late, the Nano_antennas make their elegant presence in several spheres of the technology. However, it is highly essential, at present, to have an overall awareness for the purpose of a balanced design of nano_antennas with broadband feedbacks. These days, many a technique is doing its elegant rounds invested in examining the spectral features of the log periodic nano_antenna by the excitation method of reception and discharge. The field improvement of nano_ antenna can be harmonized by several geometric, constraints, including the outer radius, the tooth angle, and the ratio of the radial sizes of consecutive teeth, which furnish effective check on the spectral resonance position and the field renovation. Taking the challenges in to consideration, a novel hybrid ABC0-PSO optimization approach is launched in the document, which involves a gifted prospect for planning and adapting the LPNA. With the result, the adaption of the related constraints incredibly increases the effectiveness of the mechanism to envision it to an acceptable level. The design of the LPNA is made by adapting the constraints which is highly appropriate for the wireless communication which is assessed for field improvement and the Purcell factor of Conventional Log periodic Toothed Antenna and Log periodic Toothed Circular Nano Antenna.
Keywords: Circular Log Periodic Nano Antenna, Field Enhancement, Purcell Factor, Genetic Algorithm, Artificial Bee Colony.
Abc pso optimization technique for parameter optimization in circular log per...eSAT Journals
Abstract
It is applicable to note that, in the overall wireless communication mechanism, the role played by the antenna is beyond the realm of words. In fact, the deployment of the antenna the wireless network faces the grave challenges of the communication of the high speed signals. Of late, the Nano_antennas make their elegant presence in several spheres of the technology. However, it is highly essential, at present, to have an overall awareness for the purpose of a balanced design of nano_antennas with broadband feedbacks. These days, many a technique is doing its elegant rounds invested in examining the spectral features of the log periodic nano_antenna by the excitation method of reception and discharge. The field improvement of nano_ antenna can be harmonized by several geometric, constraints, including the outer radius, the tooth angle, and the ratio of the radial sizes of consecutive teeth, which furnish effective check on the spectral resonance position and the field renovation. Taking the challenges in to consideration, a novel hybrid ABC0-PSO optimization approach is launched in the document, which involves a gifted prospect for planning and adapting the LPNA. With the result, the adaption of the related constraints incredibly increases the effectiveness of the mechanism to envision it to an acceptable level. The design of the LPNA is made by adapting the constraints which is highly appropriate for the wireless communication which is assessed for field improvement and the Purcell factor of Conventional Log periodic Toothed Antenna and Log periodic Toothed Circular Nano Antenna.
Keywords: Circular Log Periodic Nano Antenna, Field Enhancement, Purcell Factor, Genetic Algorithm, Artificial Bee Colony.
MODELING STUDY OF LASER BEAM SCATTERING BY DEFECTS ON SEMICONDUCTOR WAFERSjmicro
Accurate modeling of light scattering from nanometer scale defects on Silicon wafersiscritical for enabling
increasingly shrinking semiconductor technology nodes of the future. Yet, such modeling of defect
scattering remains unsolved since existing modeling techniques fail to account for complex defect and
wafer geometries. Here, we present results of laser beam scattering from spherical and ellipsoidal
particles located on the surface of a silicon wafer. A commercially available electromagnetic field solver
(HFSS) was deployed on a multiprocessor cluster to obtain results with previously unknown accuracy
down to light scattering intensity of -170 dB. We compute three dimensional scattering patterns of silicon
nanospheres located on a semiconductor wafer for both perpendicular and parallel polarization and show
the effect of sphere size on scattering. We further computer scattering patterns of nanometer scale
ellipsoidal particles having different orientation angles and unveil the effects of ellipsoidal orientation on
scattering.
Analysis and simulations of optimal geometry shapes of the 4 and 9 nano hole ...IJECEIAES
The possibility to limit and manipulate photons at nanometer scales attracted a lot of interest for exciting applications from subwavelength in laser, biosensors, biomedical and optoelectronics devices, the sensor optical properties, however; are complex due to two resonances through propagating and localized surface plasmons. The optical properties of surface plasmons (SPs) at the resonant wavelength is depending on the geometrical nanostructure of materials. In this article, we used different geometry of nanoholes array, 4 and 9 nanoholes array in a metallic film gold nanoparticle with different thickness (20,50,100) nm on SiO2 substrate with refractive index 1.46, we designed two different geometries; 4- holes: hole radius r1=200 nm, period p1=600 nm; and 9- holes: r2=100 nm, period p2=300 nm. Transmission and reflection spectrum have been calculated and simulated by FDTD Lumerical program. From results are observed the effect of thickness is interesting, transmission is increased at (t=20nm) for two arrays. Furthermore, the number of hole and its area has an influence on optical transmission and other parameters (E, H, Ref) which are characteristics of design of metallic nanostructure. We can see that there is a peak value of the wavelength at 519 nm approximately to 73% strong light transmission with 4-NHA in the other hand wavelength of 519 nm transmission is 45% with 9-NHA. strong light transmission is hopeful for many applications (biomedical devices, nanoantennas and laser optical fiber).
Optical Wireless Communication (OWC) has attracted the researchers as an alternative broadband technology for wireless communication. In OWC optical beams are used to transport data through atmosphere or even vacuum. We have proposed an OWC model and analyze the transmission performance of OW channel for indoor/ outdoor application. The performance has been judged on the basis of key parameters like BER and OSNR. A theoretical model has also been presented and validated by the simulation results. The proposed OWC channel was simulated in Optisystem which is a powerful tool of Optical communication System
Combined X-ray diffraction and X-ray fluorescence allows researchers to optimize the performance of
multi-layered, post-fabricated organic photovoltaic devices doped with gold nanoparticles.
3 d single gaas co axial nanowire solar cell for nanopillar-array photovoltai...ijcsa
Nanopillar array photovoltaics give unique advantages over today’s planar thin films in the areas of
optical properties and carrier collection, arising from their 3D geometry. The choice of the material
system, however, is essential in order to gain the advantage of the large surface/interface area associated
with nanopillars. Therefore, a well known Si and GaAs material are used in the design and studied in this
nanowire application. This work calculates and analyses the performance of the coaxial GaAs nanowire
and compared with that of Si nanowire using a semi-classical method. The current-voltage characteristics
are investigated for both under dark and AM1.5G illumination. It is found that GaAs nanowire gives almost
double efficiency with its counterpart Si nanowire. Their TCAD simulations can be validated reasonably
with that of published experimental result.
August 2022 - Top 5 Cited Articles in Microwave engineering jmicro
International Journal of Microwave Engineering (JMICRO) is a peer-reviewed, open access journal which invites high quality manuscripts that focuses on Engineering and theory associated with microwave / millimeter-wave technology, guided wave structures, electromagnetic theory and implementation. Authors are invited to submit original research works that stimulate the development of latest technology in industry and academia. Good quality review papers and short communications are also acceptable.
Improved spectral mismatch and performance of a phosphorconverted light-emitt...IJECEIAES
A phosphor-converted light-emitting diode (LED) solar simulator is an illuminance device that produced irradiance intensity and spectral close to the sunlight. It is determined as spectral mismatch, non-uniformity of irradiance, and temporal instability. This paper has improved the LED solar simulator (LSS) system to have a spectral distribution consistent with the AM1.5G spectrum at 100%. It was developed as a new prototype to have the AAA class spectral characteristics, time instability, and inconsistency according to IEC 60904-9. The results showed that an optimal approach was to use phosphor-converted natural white LED (pc-nWLED), combining a monochromatic near-infrared (NIR) (730, 800, 850, 940, and 1,000 nm) as well as the proposed LSS system capable of generating 1,000 W/m 2 irradiation over the test plane of 125×125 mm and operated continuously in a constant temperature LED state for at least 2 hours, therefore suitable for demonstration of solar cell features under standard test condition (STC) in the laboratory.
International Journal of Engineering Inventions (IJEI) provides a multidisciplinary passage for researchers, managers, professionals, practitioners and students around the globe to publish high quality, peer-reviewed articles on all theoretical and empirical aspects of Engineering and Science.
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