This document discusses using graphene metasurfaces to control mid-infrared light for optoelectronic applications. It describes how graphene interacts with plasmonic resonances in a double-Fano metasurface to strongly modulate light intensity and phase with an applied voltage. Experiments demonstrated over 80% modulation depth and precise phase shifts measured using interferometry. Applications include tunable lenses, retarders, and ultra-fast light detection or beam steering.
Development of Nonlinear Optical Microscope and ScannerRohan Sharma
For my internship at the Femtosecond Spectroscopy & Nonlinear Optics Lab at IIT Delhi, I worked on the development of nonlinear optical microscope and scanner for 10 weeks.During the internship, I developed a multimodal nonlinear optical microscope employing white light and femtosecond laser to record the optical imaging, transmission imaging as well as the second harmonic generation (SHG) imaging of a sample.
Multi-channel Detector Readout Integrated Circuits with ADCs for X-ray and Ga...Gunnar Maehlum
We are developing detector readout integrated circuits (ROICs) for X-ray and Gamma-ray spectroscopy. The ROICs are applications specific (ASICs) for satellite instrumentation in space. The ICs described in this article belong to the VATA family with integrated analog-to-digital converters (ADCs) for fully digital readout of x-ray and gamma-ray detectors. The VATAs are ideal for the readout of cadmium zinc telluride (CZT), cadmium telluride (CdTe), silicon pads and strips, and large area avalanche photodiodes (APDs) with scintillators.
Development of Nonlinear Optical Microscope and ScannerRohan Sharma
For my internship at the Femtosecond Spectroscopy & Nonlinear Optics Lab at IIT Delhi, I worked on the development of nonlinear optical microscope and scanner for 10 weeks.During the internship, I developed a multimodal nonlinear optical microscope employing white light and femtosecond laser to record the optical imaging, transmission imaging as well as the second harmonic generation (SHG) imaging of a sample.
Multi-channel Detector Readout Integrated Circuits with ADCs for X-ray and Ga...Gunnar Maehlum
We are developing detector readout integrated circuits (ROICs) for X-ray and Gamma-ray spectroscopy. The ROICs are applications specific (ASICs) for satellite instrumentation in space. The ICs described in this article belong to the VATA family with integrated analog-to-digital converters (ADCs) for fully digital readout of x-ray and gamma-ray detectors. The VATAs are ideal for the readout of cadmium zinc telluride (CZT), cadmium telluride (CdTe), silicon pads and strips, and large area avalanche photodiodes (APDs) with scintillators.
Los días 22 y 23 de junio de 2016 organizamos en la Fundación Ramón Areces un simposio internacional sobre 'Materiales bidimensionales: explorando los límites de la física y la ingeniería'. En colaboración con el Massachusetts Institute of Technology (MIT), científicos de este prestigioso centro de investigación mostraron las propiedades únicas de materiales como el grafeno, de solo un átomo de espesor, y al mismo tiempo más resistente que el acero y mucho más ligero.
In this work, the performances of a solar cell based on InGaN were simulated under the illumination conditions of one sun by employing SILVACO software.
Joint interpretation of infrasound, acoustic, and seismic waves from meteorit...Ivan Kitov
Sources of signals
Peak energy release. Acoustic (low-amplitude shock) wave
Infrasound source vs. seismic source
Seismic waves: Pn, Lg
Acousto-seismic waves: LR, LQ
Comparison with atmospheric nuclear tests: Love and Rayleigh waves
Comparison with the 1987 Chulym meteorite
Los días 22 y 23 de junio de 2016 organizamos en la Fundación Ramón Areces un simposio internacional sobre 'Materiales bidimensionales: explorando los límites de la física y la ingeniería'. En colaboración con el Massachusetts Institute of Technology (MIT), científicos de este prestigioso centro de investigación mostraron las propiedades únicas de materiales como el grafeno, de solo un átomo de espesor, y al mismo tiempo más resistente que el acero y mucho más ligero.
Copper (775) - an optics, 2PPE, and Bulk state simulation studyPo-Chun Yeh
My earlier studies on Cu(775) - a tilt cut highly crystalline copper surface using ultrafast femtosecond laser based 2-photon photoemission and its related simulation via Fortran 77.
UCSD NANO 266 Quantum Mechanical Modelling of Materials and Nanostructures is a graduate class that provides students with a highly practical introduction to the application of first principles quantum mechanical simulations to model, understand and predict the properties of materials and nano-structures. The syllabus includes: a brief introduction to quantum mechanics and the Hartree-Fock and density functional theory (DFT) formulations; practical simulation considerations such as convergence, selection of the appropriate functional and parameters; interpretation of the results from simulations, including the limits of accuracy of each method. Several lab sessions provide students with hands-on experience in the conduct of simulations. A key aspect of the course is in the use of programming to facilitate calculations and analysis.
The attached narrated power point presentation mentions the various figures of merit and the types of noise associated with photodetectors. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
[L'angolo del PhD] Alessandro Palma - XXII Ciclo - 2009accatagliato
The first part of this work describes how to use Z -> e+e- events in order to calibrate the CMS electromagnetic calorimeter, which makes use of scintillating crystals in order to precisely measure the energy of electrons and photons coming from the proton-proton interactions.
Using the very precise knowledge of the Z mass coming from LEP experiments, it is possible to set the absolute scale of the calorimeter as well as calibrating regions of the calorimeter with various topologies, and finely correct the calorimeter response to electrons. Focus is put on the first weeks of data taking.
The second part of this work concentrates on the misidentification of the electric charge of electrons/positrons in CMS. It will be shown how it is possible to extract the charge misidentification rate from the first CMS data, this time relying on the fact that electrons coming from the Z decay are always oppositely-charged.
Measuring this charge misidentification rate not only allows to perform a real-time check of the reconstruction quality during data taking, but also has an important role in the study of some physics channels. One of the studies where the charge misidentification has an important in influence is the W+/W- cross section ratio, that represent a test of the Standard Model which does not need a precise knowledge of the machine luminosity, that will be difficult to achieve with the first data.
Why radiodetection of UHECR still matters ? Karlsruhe Institute of Technol...Ahmed Ammar Rebai PhD
In the field of radiodetection in astroparticle physics, the Codalema experiment is devoted to the detection of ultra high energy cosmic rays by the radio method. The main objective is to study the features of the radio signal induced by the development of extensive air showers (EAS) generated by cosmic rays in the energy range of 10 PeV-1 EeV. After a brief presentation of the recent results of UHECR, a description the CODALEMA II and III experiments characteristics is reported.
Next, a study of the response in energy of the radio-detection method is presented. The analysis of the CODALEMA II experiment data shows that a strong correlation can be demonstrated between the primary energy and the electric field amplitude on the axis shower. Its sensitivity to the shower characteristics suggests that energy resolution of less than 20% can be achieved. It suggests also that, not only the geomagnetic emission, but also another contribution proportional to all charged particles number in the shower, could play a significant role in the radio emission measured by the antennas (as Askaryan charge-excess radiation or a Cherenkov like coherence effect).
Finally, the transition from small-scale prototype experiments, triggered by particle detectors, to large-scale antenna array experiments based on standalone detection, has emerged new problems. These problems are related to the localization, recognition and the suppression of the noisy background sources induced by human activities (such as high voltage power lines, electric transformers, cars, trains and planes) or by stormy weather conditions (such as lightning). In this talk, we focus on the localization problem which belongs to a class of more general problems usually termed as inverse problems. Many studies have shown the strong dependence of the solution of the radio-transient sources localization problem (the radio wavefront time of arrival on antennas TOA), such solutions are purely numerical artifacts. Based on a detailed analysis of some already published results of radio-detection experiments like : CODALEMA 3 in France, AERA in Argentina, TREND in China and LUNASKA in Australia, we demonstrate the ill-posed character of this problem in the sense of Hadamard. Two approaches have been used as the existence of solutions degeneration and the bad conditioning of the mathematical formulation of the problem. A comparison between the experimental results and the simulations have been made, to support the mathematical studies. Many properties of the non-linear least square function are discussed such as the configuration of the set of solutions and the bias.
PhD defence public presentation, Bayesian methods for inverse problems with point clouds: applications to single-photon lidar, ENSEEHIT, Toulouse, France
Los días 22 y 23 de junio de 2016 organizamos en la Fundación Ramón Areces un simposio internacional sobre 'Materiales bidimensionales: explorando los límites de la física y la ingeniería'. En colaboración con el Massachusetts Institute of Technology (MIT), científicos de este prestigioso centro de investigación mostraron las propiedades únicas de materiales como el grafeno, de solo un átomo de espesor, y al mismo tiempo más resistente que el acero y mucho más ligero.
In this work, the performances of a solar cell based on InGaN were simulated under the illumination conditions of one sun by employing SILVACO software.
Joint interpretation of infrasound, acoustic, and seismic waves from meteorit...Ivan Kitov
Sources of signals
Peak energy release. Acoustic (low-amplitude shock) wave
Infrasound source vs. seismic source
Seismic waves: Pn, Lg
Acousto-seismic waves: LR, LQ
Comparison with atmospheric nuclear tests: Love and Rayleigh waves
Comparison with the 1987 Chulym meteorite
Los días 22 y 23 de junio de 2016 organizamos en la Fundación Ramón Areces un simposio internacional sobre 'Materiales bidimensionales: explorando los límites de la física y la ingeniería'. En colaboración con el Massachusetts Institute of Technology (MIT), científicos de este prestigioso centro de investigación mostraron las propiedades únicas de materiales como el grafeno, de solo un átomo de espesor, y al mismo tiempo más resistente que el acero y mucho más ligero.
Copper (775) - an optics, 2PPE, and Bulk state simulation studyPo-Chun Yeh
My earlier studies on Cu(775) - a tilt cut highly crystalline copper surface using ultrafast femtosecond laser based 2-photon photoemission and its related simulation via Fortran 77.
UCSD NANO 266 Quantum Mechanical Modelling of Materials and Nanostructures is a graduate class that provides students with a highly practical introduction to the application of first principles quantum mechanical simulations to model, understand and predict the properties of materials and nano-structures. The syllabus includes: a brief introduction to quantum mechanics and the Hartree-Fock and density functional theory (DFT) formulations; practical simulation considerations such as convergence, selection of the appropriate functional and parameters; interpretation of the results from simulations, including the limits of accuracy of each method. Several lab sessions provide students with hands-on experience in the conduct of simulations. A key aspect of the course is in the use of programming to facilitate calculations and analysis.
The attached narrated power point presentation mentions the various figures of merit and the types of noise associated with photodetectors. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
[L'angolo del PhD] Alessandro Palma - XXII Ciclo - 2009accatagliato
The first part of this work describes how to use Z -> e+e- events in order to calibrate the CMS electromagnetic calorimeter, which makes use of scintillating crystals in order to precisely measure the energy of electrons and photons coming from the proton-proton interactions.
Using the very precise knowledge of the Z mass coming from LEP experiments, it is possible to set the absolute scale of the calorimeter as well as calibrating regions of the calorimeter with various topologies, and finely correct the calorimeter response to electrons. Focus is put on the first weeks of data taking.
The second part of this work concentrates on the misidentification of the electric charge of electrons/positrons in CMS. It will be shown how it is possible to extract the charge misidentification rate from the first CMS data, this time relying on the fact that electrons coming from the Z decay are always oppositely-charged.
Measuring this charge misidentification rate not only allows to perform a real-time check of the reconstruction quality during data taking, but also has an important role in the study of some physics channels. One of the studies where the charge misidentification has an important in influence is the W+/W- cross section ratio, that represent a test of the Standard Model which does not need a precise knowledge of the machine luminosity, that will be difficult to achieve with the first data.
Why radiodetection of UHECR still matters ? Karlsruhe Institute of Technol...Ahmed Ammar Rebai PhD
In the field of radiodetection in astroparticle physics, the Codalema experiment is devoted to the detection of ultra high energy cosmic rays by the radio method. The main objective is to study the features of the radio signal induced by the development of extensive air showers (EAS) generated by cosmic rays in the energy range of 10 PeV-1 EeV. After a brief presentation of the recent results of UHECR, a description the CODALEMA II and III experiments characteristics is reported.
Next, a study of the response in energy of the radio-detection method is presented. The analysis of the CODALEMA II experiment data shows that a strong correlation can be demonstrated between the primary energy and the electric field amplitude on the axis shower. Its sensitivity to the shower characteristics suggests that energy resolution of less than 20% can be achieved. It suggests also that, not only the geomagnetic emission, but also another contribution proportional to all charged particles number in the shower, could play a significant role in the radio emission measured by the antennas (as Askaryan charge-excess radiation or a Cherenkov like coherence effect).
Finally, the transition from small-scale prototype experiments, triggered by particle detectors, to large-scale antenna array experiments based on standalone detection, has emerged new problems. These problems are related to the localization, recognition and the suppression of the noisy background sources induced by human activities (such as high voltage power lines, electric transformers, cars, trains and planes) or by stormy weather conditions (such as lightning). In this talk, we focus on the localization problem which belongs to a class of more general problems usually termed as inverse problems. Many studies have shown the strong dependence of the solution of the radio-transient sources localization problem (the radio wavefront time of arrival on antennas TOA), such solutions are purely numerical artifacts. Based on a detailed analysis of some already published results of radio-detection experiments like : CODALEMA 3 in France, AERA in Argentina, TREND in China and LUNASKA in Australia, we demonstrate the ill-posed character of this problem in the sense of Hadamard. Two approaches have been used as the existence of solutions degeneration and the bad conditioning of the mathematical formulation of the problem. A comparison between the experimental results and the simulations have been made, to support the mathematical studies. Many properties of the non-linear least square function are discussed such as the configuration of the set of solutions and the bias.
PhD defence public presentation, Bayesian methods for inverse problems with point clouds: applications to single-photon lidar, ENSEEHIT, Toulouse, France
Dual-hop Variable-Gain Relaying with Beamforming over 휿−흁 Shadowed Fading Cha...zeenta zeenta
Dual-hop relaying with beamforming is studied under 휅−휇 shadowed fading environments. Exact and asymptotic results for the outage probability and average capacity are derived.
Effects of shadowing on the system performance are analyzed in different scenarios
The analysis results is general that it includes many special cases.
OPTIMIZED RATE ALLOCATION OF HYPERSPECTRAL IMAGES IN COMPRESSED DOMAIN USING ...Pioneer Natural Resources
This paper studies the application of bit allocation using JPEG2000 for compressing multi-dimensional remote sensing data. Past experiments have shown that the Karhunen- Lo
`
e
ve transform (KLT) along with rate distortion optimal(RDO) bit allocation produces good compression perfor-mance. However, this model has the unavoidable disadvan-tage of paying a price in terms of implementation complex-ity. In this research we address this complexity problem byusing the discrete wavelet transform (DWT) instead of theKLT as the decorrelator. Further, we have incorporated amixed model (MM) to find the rate distortion curves instead of the prior method of using experimental rate distortioncurves for RDO bit allocation. We compared our results tothe traditional high bit rate quantizer bit allocation modelbased on the logarithm of variances among the bands. Our comparisons show that by using the MM-RDO bit rate al-location method result in lower mean squared error (MSE)compared to the traditional bit allocation scheme. Our ap- proach also has an additional advantage of using DWT asa computationally efficient decorrelator when compared tothe KLT
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Thesis Statement for students diagnonsed withADHD.ppt
My works slideshare hl
1. Active graphene metasurfaces for
optoelectronic applications
Nima Dabidian
Gennady Shvets group
University of Texas at Austin
1
2. Switching of Mid-IR light
Interferometric measurement of
phase modulation
High collection-efficiency
photo-detector
Sub-diffraction low threshold
nano-lasers
2
3. The goal:
• Ultra-fast devices for modulation of light intensity, phase ,
polarization state
• Ultra-fast detection of light intensity. Polarization state.
• Thin device
• Efficient
• Active material: mechanical tunability vs electrical
3
4. Mid-infrared optical properties of graphene
• Broadband response
• Small losses
𝜎 𝜔 = 𝜎𝑟 𝜔 + 𝑖 𝜎𝑖 𝜔
𝜎𝑟 ∶ Resistive
𝜎𝑖 : Inductive 𝝈𝒊/𝝈𝒓
S. H. Mousavi, e al, Nano Lett. 2013,
13,1111-1117 4
5. How to switch light
• A mode with narrow linewidth
(high quality factor)
• Large spectral shift (large field
enhancement)
• Zero reflectivity at the minimum
5
29. Conclusion
• Dynamic modulation of amplitude, phase , polarization state of
Mid-IR light is made possible by integration of graphene to
Fano-resonance plasmonic metasurfaces
• Electrically connected metasurface provide the opportunities
for independent gating across metasurface and could be
potentially used in holographic application.
29