A5078285803- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- GaN-based semiconductor devices and materials
- Optical Coatings and Gratings
- Blockchain Technology Applications and Security
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Thermal Radiation and Cooling Technologies
- Cloud Data Security Solutions
- Metal and Thin Film Mechanics
- Copper Interconnects and Reliability
- Advanced Antenna and Metasurface Technologies
- MXene and MAX Phase Materials
- Molecular Junctions and Nanostructures
- IoT and Edge/Fog Computing
- Copper-based nanomaterials and applications
- Photonic and Optical Devices
- Advanced Steganography and Watermarking Techniques
- Superconducting and THz Device Technology
- Vehicle License Plate Recognition
- Hate Speech and Cyberbullying Detection
- Chalcogenide Semiconductor Thin Films
- Privacy, Security, and Data Protection
- Magneto-Optical Properties and Applications
Stanford University
2021-2022
Purdue University West Lafayette
2016-2020
Cadence Design Systems (United States)
2020
State Street (United States)
2019
National University of Singapore
2019
Indian Institute of Science Bangalore
2011
University of California, Santa Barbara
2002
Plasmonics is a rapidly developing field at the boundary of physical optics and condensed matter physics. It studies phenomena induced by associated with surface plasmons—elementary polar excitations bound to surfaces interfaces good nanostructured metals. This Roadmap written collectively prominent researchers in plasmonics. encompasses selected aspects nanoplasmonics. Among them are fundamental aspects, such as quantum plasmonics based on quantum-mechanical properties both underlying...
Abstract Metasurfaces are thin two-dimensional metamaterial layers that allow or inhibit the propagation of electromagnetic waves in desired directions. For example, metasurfaces have been demonstrated to produce unusual scattering properties incident plane guide and modulate surface obtain radiation properties. These employed, for create innovative wireless receivers transmitters. In addition, recently proposed confine waves, thereby avoiding undesired leakage energy increasing overall...
Due to their exceptional plasmonic properties, noble metals such as, gold and silver, have been the materials of choice for demonstration various nanophotonic phenomena. However, metals' softness, lack tailorability, low melting point, along with point depression in nanostructures as well challenges thin film fabrication device integration standard semiconductor processing, prevented realization practical devices technologically important high temperature heat-assisted applications. In...
Taking the temperature of hot carriers Hot are expected to arise in plasmonic nanostructures because nonradiative decay surface plasmons. However, identifying and determining just how “hot” these actually has been challenging. Reddy et al. devised a technique that looks at carrier transport through single molecular junction, which effectively acts as an energy filter, show it can be used determine distribution nanostructure (see Perspective by Martín-Moreno). These could harnessed enhance...
Overcoming the challenge of growing ultrathin metallic films is great importance for practical applications nanoplasmonic structures. In present work, epitaxial, (<10 nm) plasmonic TiN are grown on MgO using DC reactive magnetron sputtering. The optical properties studied through variable angle spectroscopic ellipsometry and Hall measurements. As film thickness decreases, they become less exhibit higher loss while still remaining in range. These trends related to decreasing carrier...
Understanding the temperature dependence of optical properties thin metal films is critical for designing practical devices high applications in a variety research areas, including plasmonics and near-field radiative heat transfer.Even though bulk metals at elevated temperatures have been studied, temperature-dependent data films, with thicknesses ranging from few tens to hundreds nanometers, largely missing.In this work we report on constants single-and polycrystalline gold wavelength range...
By combining first-principles theoretical calculations and experimental optical structural characterization such as spectroscopic ellipsometry, X-ray spectroscopy, electron microscopy, we study the dielectric permittivity plasmonic properties of ultrathin TiN films at an atomistic level. Our results indicate a remarkably persistent metallic character progressive red shift plasmon energy thickness film is reduced, which consistent with previous studies. The microscopic origin this trend...
Silver holds a unique place in plasmonics compared to other noble metals owing its low losses the visible and near-IR wavelength ranges. With growing interest local heating high temperature applications of plasmonics, it is becoming critical characterize dielectric function nanometer-scale thin silver films at higher temperatures, especially near breakdown temperature, which depends on film thickness crystallinity. So far, such comprehensive study has been missing. Here we report situ...
Thin superconducting films are important components of modern low-temperature electronics, and their performance can degrade with decreasing thickness, owing to various factors that often difficult disentangle. The authors analyze material properties, electron-phonon coupling, transport in high-quality epitaxial TiN down 3 nm thickness. thinnest show a reduction the transition temperature by almost factor 3, which is associated minute amount magnetic disorder. In thin scatterers occur...
In this work, temperature-dependent optical properties of refractory plasmonic transition metal nitrides and dielectric thin films are utilized to design realize a planar, direct-contact, nanophotonic metacavity for remote, all-optical sensing wide range surface temperatures (from room temperature above 1000 °C). The proposed hybrid device integrates the cavity with planar metasurface that utilizes material components, namely, titanium nitride (TiN) silicon (Si3N4), operates in spectral...
Active control over the flow of light is highly desirable because its applicability to information processing, telecommunication, and spectroscopic imaging. In this paper, by employing tunability carrier density in a 1 nm titanium nitride (TiN) film, we numerically demonstrate deep phase modulation (PM) an electrically tunable gold strip/TiN film hybrid metasurface. A 337° PM achieved at 1.550 μm with 3% change TiN film. We also that continuous 180° can be realized 1.537 applying realistic...
0.1 /spl mu/m Schottky-collector AlAs/GaAs resonant tunnel diodes were fabricated; from their measured DC and microwave parameters, including the effect of quantum well lifetime, a maximum frequency oscillation 900 GHz is computed. To authors' knowledge this highest reported for any diode.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Solar thermal technologies have great potential to provide low-cost storage for solar energy. However, their efficiencies are limited by a lack of scalable, mechanically flexible, durable, yet highly-efficient spectrally-selective absorbers suitable high temperatures at low concentrations. Here, we overcome these challenges fabricating scalable free-standing thin-film Si absorber and emitter (SSTFS) composite. Its high-temperature emittance shows strong spectral selectivity, even 595 °C....
The generation of nonequilibrium hot-carriers from the decay surface plasmons has been attracting intense research attention in last decade due to both fundamental aspects extreme light-matter interactions and potential practical applications. Here, we overview physics associated with plasmon-assisted hot-carrier outline key applications processes for photodetection, photovoltaics photocatalysis. We also discuss recent developments employing molecular tunnel junctions as barriers extracting...
This paper presents an analysis of frequency reconfigurable micro strip patch antennas for multi-band, multimode wireless communication systems, incorporating Radio Frequency-PIN diodes as switches. Two configurations are discussed with double-band characteristics: a antenna modifiable and switchable slots; rectangular electronically controllable parasitic element. The objective is to evaluate the feasibility active be used in cognitive radio applications predict functional performance...
The multilayer circuits are suffers from passive components effect to transit high frequency signal. capacitive and inductive reactance of the planar integrated circuit. part overall circuit efficiency depending on passivity components, interconnections its geometrical structure, which is helps build low loss (MIC). aim this paper design coplanar wave guide (CPW) microstrip line transition structure with 1GHz 75GHz operating band. linear tapered method used inspected four different CPW...
In this study, we present recent developments on growing epitaxial quality, ultra-thin titanium nitride films that exhibit very good metallic/plasmonic properties, comparable with their bulk counterparts. The potential of these for extreme light confinement and electrical control is discussed.
In recent years space and military communication technology relying on sensors to monitor improve subsystem performance by using high efficiency, low noise, small size, cost & highly reliable components. Many of these components contain oscillator as one the key circuit component with lowest phase noise requirement. A typical RF / Microwave consists an active device (transistor) passive frequency determining element (resonator). This paper proposed a novel design L-band Coaxial Ceramic...