Reflectance Modulation from a Metasurface Coupled to Intersubband Transitions in Semiconductor Quantum Wells using Quantum Tunneling
Abstract not provided.
Publications
Characteristic Transconductance of P-Type and N-Type Deeply Depleted Graphene-Insulator-Semiconductor Junction Photodetectors
Abstract not provided.
Radiation Induced Defects in InAs/InAsSb Type II Superlattices Characterized with Time-resolved Microwave Reflectance and DFT
Abstract not provided.
Parametric Analysis of Vertically Oriented Metamaterials for Wideband Omnidirectional Absorption
Abstract not provided.
Tunable Dual-Band Graphene-Based Infrared Reflectance Filter
Abstract not provided.
A hybrid tunable III-V metasurface using voltage-controlled quantum tunneling
Abstract not provided.
Ultrathin energy-efficient field-effect tunable III-V hybrid metasurface
Abstract not provided.
Tunable dual-band graphene-based infrared reflectance filter
Optics Express
We experimentally demonstrated an actively tunable optical filter that controls the amplitude of reflected long-wave-infrared light in two separate spectral regions concurrently. Our device exploits the dependence of the excitation energy of plasmons in a continuous and unpatterned sheet of graphene on the Fermi-level, which can be controlled via conventional electrostatic gating. The filter enables simultaneous modification of two distinct spectral bands whose positions are dictated by the device geometry and graphene plasmon dispersion. Within these bands, the reflected amplitude can be varied by over 15% and resonance positions can be shifted by over 90 cm-1. Electromagnetic simulations verify that tuning arises through coupling of incident light to graphene plasmons by a grating structure. Importantly, the tunable range is determined by a combination of graphene properties, device structure, and the surrounding dielectrics, which dictate the plasmon dispersion. Thus, the underlying design shown here isapplicable across a broad range of infrared frequencies.
Resonant Ultrathin Infrared Detectors Enabling High Quantum Efficiency
Abstract not provided.
Microwave Based Lifetime Measurements and Analysis for Detector Materials
Abstract not provided.
In-situ Annealing Studies of Radiation Induced Defects in InAs/InAsSb Type-II Superlattices under Ion Irradiation
Abstract not provided.
Dual-band Tunable Graphene-Based Filter
Abstract not provided.
Phonon Light Switches
Abstract not provided.
Parametric Analysis of Vertically Oriented Metamaterials for Wideband Omnidirectional Perfect Absorption
2018 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting, APSURSI 2018 - Proceedings
Metamaterials provide a means to tailor the spectral response of a surface. Given the periodic nature of the metamaterial, proper design of the unit cell requires intimate knowledge of the parameter space for each design variable. We present a detailed study of the parameter space surrounding vertical split-ring resonators and planar split-ring resonators, and demonstrate widening of the perfect absorption bandwidth based on the understanding of its parameter space.
Tunable Infrared Plasmonic Devices via Ferroelectric Domain Reconfiguration
Abstract not provided.
Circuit modeling of nanoantenna enabled detectors
Abstract not provided.
Optical Detection Using Deeply Depleted Graphene-Oxide-Semiconductor Junction
Abstract not provided.
Integrating Resonant Structures with IR Detectors
Abstract not provided.
Improved infrared detection using nanoantennas
International Conference on Optical MEMS and Nanophotonics
We examine integration of a patterned metal nanoantenna (or metasurface) directly onto long-wave infrared detectors. These structures show significantly improved external quantum efficiency compared to their traditional counterparts. We will show simulation and experimental results.
Dual-band tunable graphene-based filter
International Conference on Optical MEMS and Nanophotonics
We have demonstrated a scalable dual-band tunable infrared filter based on gating of a continuous graphene layer. The measured and modeled response of the device are in good agreement.
Circuit modeling of nanoantenna enabled detectors
Abstract not provided.
Resonantly enhanced infrared detectors based on type-II superlattice absorbers
Abstract not provided.
Nanoantenna-enhanced absorption in thin infrared detector layers
Abstract not provided.
Effects of 4.5 MeV and 63 MeV Proton Irradiation on Carrier Lifetime of InAs/InAsSb Type-II Superlattices
Abstract not provided.
Comparing Radiation Induced Lifetime Degradation in InAs/InAsSb Type-II Superlattices using 4.5 and 63 MeV Proton Irradiations
Abstract not provided.
Results 51–75 of 87