A5026380911- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Mechanical and Optical Resonators
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Quantum Information and Cryptography
- Microfluidic and Bio-sensing Technologies
- Quantum optics and atomic interactions
- Orbital Angular Momentum in Optics
- Solid State Laser Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Cold Atom Physics and Bose-Einstein Condensates
- Antenna Design and Analysis
- Advanced Photonic Communication Systems
- Electromagnetic Scattering and Analysis
- Network Time Synchronization Technologies
- Copper-based nanomaterials and applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced MEMS and NEMS Technologies
- Chalcogenide Semiconductor Thin Films
- Optical and Acousto-Optic Technologies
Nokia (United States)
2023-2025
Providence College
2023
Yale University
2019-2022
Tân Tạo University
2021
University of Arizona
2021
Bangladesh University of Engineering and Technology
2013-2017
Daffodil International University
2016-2017
The absence of the single-photon nonlinearity has been a major roadblock in developing quantum photonic circuits at optical frequencies. In this paper, we demonstrate periodically-poled thin film lithium niobate microring resonator (PPLNMR) that reaches 5,000,000%/W second harmonic conversion efficiency---almost 20-fold enhancement over state-of-the-art---by accessing its largest $\chi^{(2)}$ tensor component $d_{33}$ via quasi-phase matching. corresponding single photon coupling rate...
Materials with strong second-order ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mi>χ</mml:mi> <mml:mspace width="negativethinmathspace"/> <mml:mo stretchy="false">(</mml:mo> <mml:mn>2</mml:mn> stretchy="false">)</mml:mo> </mml:mrow> </mml:msup> </mml:math> ) optical nonlinearity, especially lithium niobate, play a critical role in building parametric oscillators (OPOs). However, chip-scale integration of...
Superconducting cavity electro-optics (EO) presents a promising route to coherently convert microwave and optical photons distribute quantum entanglement between superconducting circuits over long-distance through an network. High EO conversion efficiency demands transduction materials with strong Pockels effect excellent transparency. Thin-film Lithium Niobate (TFLN) offers these desired characteristics however so far has only delivered unidirectional efficiencies on the order of $10^{-5}$,...
We demonstrate waveguide-integrated superconducting nanowire single-photon detectors on thin-film lithium niobate (LiNbO3, LN). Using a 250 μm-long NbN lithographically defined top of 125 LN nanowaveguide, an on-chip detection efficiency 46% is realized with simultaneous high performance in dark count rates and timing jitter. As possesses χ(2) second-order nonlinear electro-optic properties, efficient detector opens up the possibility to construct small-scale fully integrated quantum...
Abstract Hybrid quantum systems are essential for the realization of distributed networks. In particular, piezo-mechanics operating at typical superconducting qubit frequencies features low thermal excitations, and offers an appealing platform to bridge processors optical telecommunication channels. However, integrating optomechanical elements cryogenic temperatures with sufficiently strong interactions remains a tremendous challenge. Here, we report integrated cavity piezo-optomechanical...
In this article, we have theoretically investigated the performance of graphene-hexagonal Boron Nitride (hBN) multilayer structure (hyper crystal) to demonstrate all angle negative refraction along with superior transmission. hBN, one latest natural hyperbolic materials, can be a very strong contender form hyper crystal graphene due its excellence as graphene-compatible substrate. Although bare hBN exhibit refraction, transmission is generally low high reflectivity. Whereas graphene's 2D...
Thin-film lithium niobate (TFLN) based frequency doublers have widely been recognized as an essential component for both classical and quantum optical communications. Nonetheless, the efficiency (unit: %/W) of these devices is hindered by imperfections present in quasi-phase matching (QPM) spectrum. In this report, we a thorough experimental study spectral TFLN with varying lengths, ranging from 5 to 15 mm. A non-destructive diagnostic method on scattered light imaging proposed employed...
Thin-film lithium niobate (LN) has recently emerged as a playground for chip-scale nonlinear optics and leads to efficient frequency conversions from near-infrared near-visible bands. For many quantum photonics applications, it is desirable operate deep into the visible band within LN's transparency window. However, strong material dispersion at short wavelengths makes phase-matching difficult, necessitating sub-micrometer scale control of domain structures phase-matching. Here, we report...
In this article, we have theoretically demonstrated the mechanism of an active tractor beam for multiple fully immersed objects with additional abilities to yielding stable long distance levitation, a controlled rotation and desired 3D trapping. This is single optical set‐up by using two coaxial, or even non‐coaxial, superimposed higher order monochromatic Bessel beams reverse helical nature different frequencies . The can possess periodic intensity variations both along around beam‐axis due...
In this article, it has been theoretically shown that broad angle negative refraction is possible with asymmetric anisotropic metamaterials constructed by only dielectrics or loss less semiconductors at the telecommunication and relative wavelength range. Though natural uniaxial materials can exhibit refraction, maximum of critical incident lie in a very narrow This notable problem be overcome our proposed structure. structures, originates from highly elliptical iso-frequency.This...
We report intracavity Bragg scattering induced by the photorefractive (PR) effect in high- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Q</mml:mi> </mml:math> lithium niobate ring resonators at cryogenic temperatures. show that when a cavity mode is strongly excited, PR imprints long-lived periodic space-charge field. This residual field turn creates refractive index modulation pattern dramatically enhances back of an incoming probe light, and results...
In graphene dielectric multilayer structure, a very interesting phenomena such as epsilon near zero property rises naturally. However, this (along with the proper control of chemical potential and gate voltage) multi-layer stack has not been used so far to make novel photonic switches. article, we have shown theoretically that in graphene-dielectric stack, which acts an anisotropic metamaterial, full reflection transmission light at specific wavelength or frequency can be controlled simply...
Slow light has always been a topic of extreme interest for researchers and scientists in order to utilize the full potential switching, memory devices quantum optics. However, slow phenomena its applications switching by tunable graphene based hyperbolic metamaterial have not still introduced literature. Here we theoretically propose numerically analyze device from concept controlling group velocity metamaterials. In THz range, graphene-dielectric stack can behave as metamaterials...
Thin-film lithium niobate is an attractive integrated photonics platform due to its low optical loss and favorable nonlinear electro-optic properties. However, in applications such as second harmonic generation, frequency comb microwave-to-optics conversion, the device performance strongly impeded by photorefractive effect inherent thin-films. In this paper, we show that dielectric cladding on microring resonator has a significant influence effect. By removing layer, ring resonators can be...
We experimentally demonstrate optical detection at 12.5~bits per incident photon, 9.4~dB higher than the theoretical limit of conventional coherent detection. A single laser transmits both data and clock, undergoes 77~dB attenuation before quantum followed by clock recovery.
Thin Film Solar Cell is a technology which has great potential as it low material consumption and relatively high efficiency to others. Among thin film solar cells CIGS promising one. But due scarcity of gallium indium its industrial production can be affected. Here in this paper via simulation (using device simulator) we have tried achieve good acceptable using very layer absorber with the help grading appropriate composition by optimizing emitter close having thick layer.
Hybrid superconducting-photonic microresonators are a promising platform for realizing microwave-to-optical transduction. However, the absorption of scattered photons by superconductors leads to unintended microwave resonance-frequency variation and line-width broadening. Here, we experimentally study dynamics this effect its impact on microwave-to-optics conversion in an integrated lithium niobate--superconductor hybrid-resonator platform. We unveil adiabatic frequency shifting intracavity...
In this work, short channel effects such as drain induced barrier lowering, sub-threshold swing, on-current and off-current on-off ratio have been analyzed for different oxide materials gate double junction-less transistors by using device simulator. Just like inversion mode MOSFETS, show better when high-k dielectrics are used.
In this article, we have applied Maxwell-Schrodinger analogy to introduce the idea of electromagnetic metamaterial based band gap in semiconductor regime. We found a new type hetero-structures, which is analogous spatial average single negative (SASN) multi-layer photonic crystal. Interestingly, width such bandgaps controllable according designers' will. Perfect tunneling propagating stationary states and strong delocalization bounded electronic also been observed, analogue enhancement...
Pulse-Position Modulation (PPM) format using independent free-running clocks transmitted optically is demonstrated with PPM orders from 2 10 to 16 , enabling flexible data rate and Photon Information Efficiency (PIE).
In this work a simple analytical accurate model for the threshold voltage of double gate junction less field effect transistor has been proposed. The derivation performed by taking channel doping, oxide thickness, high k dielectric and thickness into consideration. Validity equation verified device simulation.