1) The document discusses determining the mean inner potential of magnetic nanoparticles (MNPs) using electron holography.
2) Electron holography is a technique that can be used to measure electrostatic potentials by recording the interference between electron waves that pass through a sample and reference waves.
3) Preliminary measurements have been made and work is ongoing to fully characterize the mean inner potential of MNPs using this technique.
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Rob Meagley and Andrew Bleloch at Health Extension Salon #5Health_Extension
Dr. Rob Meagley and Dr. Andrew Bleloch present their focused summary of the recent 2012 Foresight Nanotechnology Conference, answering the question: which will be powerfull enough to intervene in aging processes first: biotechnology or nanotechnology?
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Rob Meagley and Andrew Bleloch at Health Extension Salon #5Health_Extension
Dr. Rob Meagley and Dr. Andrew Bleloch present their focused summary of the recent 2012 Foresight Nanotechnology Conference, answering the question: which will be powerfull enough to intervene in aging processes first: biotechnology or nanotechnology?
Radiation Hardening by Design is one of the hardware based solution to one of the most troublesome problem faced by digital circuits in the space.
RHBD provides varieties of techniques to make the circuit resilient towards such effects and ensures proper malfunctioning of the circuit.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Deep two-photon brain imaging with a red-shifted fluorometric Ca2+ indicatorPetteriTeikariPhD
Journal club for the article by Carsten Tischbirek et al. (2015):
Tischbirek, Carsten, et al. "Deep two-photon brain imaging with a red-shifted fluorometric Ca2+ indicator." Proceedings of the National Academy of Sciences 112.36 (2015): 11377-11382.
http://dx.doi.org/10.1073/pnas.1514209112
Alternative download link: https://dl.dropboxusercontent.com/u/6757026/slideShare/journalClub_Dec2015_v2.pdf
Radiation Hardening by Design is one of the hardware based solution to one of the most troublesome problem faced by digital circuits in the space.
RHBD provides varieties of techniques to make the circuit resilient towards such effects and ensures proper malfunctioning of the circuit.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Deep two-photon brain imaging with a red-shifted fluorometric Ca2+ indicatorPetteriTeikariPhD
Journal club for the article by Carsten Tischbirek et al. (2015):
Tischbirek, Carsten, et al. "Deep two-photon brain imaging with a red-shifted fluorometric Ca2+ indicator." Proceedings of the National Academy of Sciences 112.36 (2015): 11377-11382.
http://dx.doi.org/10.1073/pnas.1514209112
Alternative download link: https://dl.dropboxusercontent.com/u/6757026/slideShare/journalClub_Dec2015_v2.pdf
the paper focuses on the fabrication and characterization of heterostructures using transition metal dichalcogenide (TMDC) monolayers. The authors describe the process of mechanical exfoliation to obtain thin flakes of TMDC material, which are then placed on a viscoelastic polydimethylsiloxane film. These monolayers are subsequently stamped onto a silicon wafer covered with thermal oxide to create heterobilayers .
The paper also discusses the use of ultrafast optical-pump/terahertz-probe near-field microscopy to study these heterostructures. The authors explain that this technique allows them to investigate the electric near fields and scattered fields of the emitted waveforms, as well as the photo-induced polarizability .
The experimental setup involves a high-average-power, low-noise Yb:YAG thin-disc oscillator, which generates terahertz probe pulses through optical rectification of 200-fs-long pulses. These pulses are centered at a wavelength of 1,030 nm and are generated in a gallium phosphide crystal .
The paper likely includes additional details on the experimental procedures, data analysis, and results obtained from the terahertz near-field microscopy experiments. It may also discuss the potential applications and implications of the findings
Overview of unique capabilities of the ADF modeling suite to model properties of organic electronics (charge transport, phosphorescence, light absorbance). Highlighted with examples from the recent literature.
Simulation Of Algan/Si And Inn/Si Electric - Devicesijrap
In this work, efficient solar-blind metal-semiconductor photodetectors grown on Si (111) by
molecular beam epitaxy are reported. Growth details are described,the comparison enters the
properties electric of InN/Si and AlGaN/Si photodectors with 0.2 µm of AlGaN and InN layers.
Modeling and simulation were performed by using ATLAS-TCAD simulator. Energy band
diagram, doping profile, conduction current density,I-V caracteristic , internal potential and
electric field were performed.
Simulation of AlGaN/Si and InN/Si ELECTRIC –DEVICESijrap
In this work, efficient solar-blind metal-semiconductor photodetectors grown on Si (111) by
molecular beam epitaxy are reported. Growth details are described,the comparison enters the
properties electric of InN/Si and AlGaN/Si photodectors with 0.2 μm of AlGaN and InN layers.
Modeling and simulation were performed by using ATLAS-TCAD simulator. Energy band
diagram, doping profile, conduction current density,I-V caracteristic , internal potential and
electric field were performed.
Simulation of AlGaN/Si and InN/Si ELECTRIC –DEVICESijrap
In this work, efficient solar-blind metal-semiconductor photodetectors grown on Si (111) by
molecular beam epitaxy are reported. Growth details are described,the comparison enters the
properties electric of InN/Si and AlGaN/Si photodectors with 0.2 µm of AlGaN and InN layers.
Modeling and simulation were performed by using ATLAS-TCAD simulator. Energy band
diagram, doping profile, conduction current density,I-V caracteristic , internal potential and
electric field were performed
NOVEL METHODOLOGY OF THE ULTRA SONIC BEAM IN LINEAR ARRAY TRANSDUCER FOR HIGH...Journal For Research
In this paper, the focusing of ultrasound beam is considered. Electronic circuitry is considered as support to the theme of the work. The results presented in this paper are notable for improved resolution. The extension of the application diversity is also proposed based on use of Piezo electric transceducers.
MAGNETIZED PLASMA WITH FERROMAGNETIC GRAINS AS A VIABLE NEGATIVE REFRACTIVE I...ijrap
The propagation of electromagnetic waves in a cold magnetized plasma with ferromagnetic grains (MPFG)
in the high frequency domain is studied theoretically. The dispersion of MPFG which is controlled by the
simultaneous characterization of the permittivity and permeability tensors. is investigated theoretically and
numerically near the resonance frequency. It is found that MPFG becomes transparent for the waves that
cannot propagate in conventional magnetized electron-ion plasma. The refractive index of the waves
propagating parallel to the applied magnetic field is found to be negative for the extraordinary wave in
certain frequency domain. The results obtained show that in a narrow band of the super-high-frequency
range near the electron cyclotron frequency, MPFG possess all the known characteristics of negative
refractive index media, which would make it as a viable alternative medium to demonstrate the known and
predicted peculiar properties of media having negative index of refraction.
Resonant Rayleigh Scattering from Collective Molecular ExcitationsbalasubrahmaniyamM
Resonant Rayleigh scattering (RRS) is the pronounced elastic scattering of photons present at the vicinity of the natural resonances of sub-wavelength physical objects such as molecules, which otherwise scatter negligibly. Here, we study RRS from molecular ensembles strongly coupled to an optical microcavity. Under these conditions, the coherent interaction between the molecules and the cavity mode produces collective molecular states known as cavity polaritons and which can drastically modify the properties these molecules. Our spectroscopic measurements reveal that strong RRS occurs at the polaritonic energies, reaching ~25% efficiency. Interestingly, this resonant scattering corresponds to the collective scattering of each photon from a macroscopically-large ensemble of molecules, rather than the scattering by individual ones, as in the usual case. We show that the scattering from the polaritonic states exhibit non trivial behaviors, specifically a linear dependence of the scattering strength on their photonic component. We believe that these observations, together with further investigation, may lead to a deeper understanding of these delocalized, collective molecular excitations, their non-equilibrium transport and the role of disorder in their dynamics.
Electrophoresis is a scientific laboratory technique that is used to separate DNA, RNA, or protein molecules based on their size and electrical charge. An electric current is passed through the molecules to move them so that they can be separated via a gel. The pores present in the gel work like a sieve, allowing smaller molecules to pass through more quickly and easily than the larger molecules. According to the way conditions are adjusted during electrophoresis, the molecules can be separated in the desired size range.
What is electrophoresis and what are its uses?
Electrophoresis is a very broadly used technique that, fundamentally, applies electric current to biological molecules – they’re usually DNA, but they can be protein or RNA, too – and separates these fragments into pieces that are larger or smaller in size.
The phenomenon of electrophoresis was first observed by Russian professors Peter Ivanovich Strakhov and Ferdinand Frederic Reuss in 1807 at Moscow University. A constant application of electric field caused the particles of clay dispersed in water to migrate, showing an electrokinetic phenomenon.
Electrophoresis can be defined as an electrokinetic process that separates charged particles in a fluid using an electrical field of charge. Electrophoresis of cations or positively charged ions is sometimes referred to as cataphoresis (or cataphoretic electrophoresis). In contrast, sometimes, the electrophoresis of anions or negatively charged ions is referred to as anaphoresis (or anaphoric electrophoresis).
It’s used in a variety of applications. Though it is most often used in life sciences to separate protein molecules or DNA, it can be achieved through several different techniques and methods depending upon the type and size of the molecules.
The methods differ in some ways, but all we need is a source for the electrical charge, a support medium and a buffer solution. Electrophoresis is also used in laboratories for the separation of molecules based on their size, density and purity.
The method used to separate macromolecules such as DNA, RNA, or protein molecules is known as gel electrophoresis.
It is used in forensics for –
Nucleic acid molecule sizing
DNA fragmentation for southern blotting
RNA fragmentation for northern blotting
Protein fragmentation for western blotting
Separation of PCR products analysis
Detection and analysis of variations or mutations in the sequence
Its clinical applications involve –
Serum protein electrophoresis
Lipoprotein analysis
Diagnosis of haemoglobinopathies and hemoglobin A1c.
The fundamental principle of electrophoresis is the existence of charge separation between the surface of a particle and the fluid immediately surrounding it. An applied electric field acts on the resulting charge density, causing the particle to migrate and the fluid around the particle to flow.
It is the process of separation or purification of protein molecules, DNA, or RNA that differ in charge, size.
1. Pramodh Yapa1
Azadeh Akhtari−Zavareh1
Nima Nateghi2
David Menard2
Arthur Yelon2
Karen Kavanagℎ1
É
IN A NUTSHELL
°
DETERMINING THE MEAN INNER POTENTIAL OF MNP
USING ELECTRON HOLOGRAPHY
ELECTRON HOLOGRAPHY
𝜙 𝑥
𝑉0 𝑥 𝑡 𝑥 𝐵⊥ 𝑥
𝜙 𝑥 = 𝑐𝑉0 𝑥 𝑡 𝑥 −
𝑒
ℏ
𝐵⊥ 𝑥 𝑡 𝑥 𝑑𝑥
REFERENCES
1. MnP nanoclusters embedded in GaP epitaxial films grown by organometallic vapor-phase epitaxy: A reciprocal space mapping
and transmission electron microscopy study. Samuel Lambert-Milot et al. 2012, J. Vac. Sci. Technol. A 30, 061510
2. Off-axis electron holography of ferromagnetic multilayer nanowires. Azadeh Akhtari-Zavareh et al. 2014, J. Appl. Phys. 116,
023902
MEASUREMENTS & RESULTS
±
ONGOING WORK
ACKNOWLEDGEMENTS
We thank NSERC for partial funding, and CFI, BCKDF, and
SFU for their support of 4DLabs
facilities used in this work