A5047474066- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Advanced Antenna and Metasurface Technologies
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Neural Networks and Reservoir Computing
- Orbital Angular Momentum in Optics
- Thermal Radiation and Cooling Technologies
- Antenna Design and Analysis
- Optical Network Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Optical Wireless Communication Technologies
- Quantum Dots Synthesis And Properties
- Advanced Optical Imaging Technologies
- Liquid Crystal Research Advancements
- Photorefractive and Nonlinear Optics
- Optical Polarization and Ellipsometry
- Semiconductor Lasers and Optical Devices
- Magneto-Optical Properties and Applications
- Optical Coatings and Gratings
- Quantum Electrodynamics and Casimir Effect
- Advanced Memory and Neural Computing
- Quantum Mechanics and Non-Hermitian Physics
- Polydiacetylene-based materials and applications
Vanderbilt University
2015-2024
Oak Ridge National Laboratory
2021
University of Michigan
2021
City University of New York
2021
The Graduate Center, CUNY
2021
CUNY Advanced Science Research Center
2021
Nashville Oncology Associates
2016
SRI International
2014
Appalachian College of Pharmacy
2014
University of California, Berkeley
2007-2011
Plasmonic metasurfaces have recently attracted much attention due to their ability abruptly change the phase of light, allowing subwavelength optical elements for polarization and wavefront control. However, most previously demonstrated metasurface designs suffer from low coupling efficiency are based on metallic resonators, leading ohmic loss. Here, we present an alternative approach plasmonic by replacing resonators with high-refractive-index silicon cut-wires in combination a silver...
While the nonradiative decay of surface plasmons was once thought to be only a parasitic process that limits performance plasmonic devices, it has recently been shown can harnessed in form hot electrons for use photocatalysis, photovoltaics, and photodetectors. Unfortunately, quantum efficiency electron devices remains low due poor injection some cases optical absorption. Here, we demonstrate how metamaterial perfect absorbers used achieve near-unity absorption using ultrathin nanostructures...
Abstract Circularly polarized light is utilized in various optical techniques and devices. However, using conventional systems to generate, analyse detect circularly involves multiple elements, making it challenging realize miniature integrated While a number of ultracompact elements for manipulating have recently been demonstrated, the development an efficient highly selective photodetector remains challenging. Here we report on detector that combines large engineered chirality, realized...
Strong nonlinear light-matter interaction is highly sought-after for a variety of applications including lasing and all-optical light modulation. Recently, resonant plasmonic structures have been considered promising candidates enhancing optical processes due to their ability greatly enhance the near-field; however, small mode volumes prevent inherently large susceptibility metal from being efficiently exploited. Here, we present an alternative approach that utilizes Fano-resonant silicon...
All-dielectric metamaterials offer a potential low-loss alternative to plasmonic at optical frequencies. Here, we take advantage of the low absorption loss as well simple unit cell geometry demonstrate large-scale (centimeter-sized) all-dielectric metamaterial perfect reflectors made from silicon cylinder resonators. These reflectors, operating in telecommunications band, were fabricated using self-assembly based nanosphere lithography. In spite disorder originating process, average...
Metasurfaces provide a versatile platform for manipulating the wavefront of light using planar nanostructured surfaces. Transmissive metasurfaces, with full 2π phase control, are particularly attractive replacing conventional optical elements due to their small footprint and broad functionality. However, operational bandwidth metasurfaces has been critical limitation is directly connected either resonant response or diffractive dispersion lattice. While multiwavelength continuous band...
Abstract Although the nonradiative decay of surface plasmons was once thought to be only a parasitic process within plasmonic and metamaterial communities, hot carriers generated from plasmon offer new opportunities for harnessing absorption loss. Hot can harnessed applications ranging chemical catalysis, photothermal heating, photovoltaics, photodetection. Here, we present review on recent developments concerning photodetection based electrons. The basic principles progress electron...
All-dielectric metamaterials utilizing Mie resonances in high-permittivity dielectric resonators offer a low-loss alternative to plasmonic metamaterials. Here we present the demonstration of single-negative all-dielectric metamaterial, comprised single layer cylindrical silicon on silicon-on-insulator substrate, that possesses peak reflectance over 99% and an average 98% across 200 nm wide bandwidth short-wavelength infrared region. The study is also extended disordered metamaterials,...
Mastering dynamic free-space spectral control and modulation in the near-infrared (NIR) optical regimes remains a challenging task that is hindered by available functional materials at high frequencies. In this work, we have realized an efficient metadevice capable of minimizing thermal mass vanadium dioxide phase-change material (PCM) placing PCM feed gap bow-tie field antenna. The device has experimentally measured tuning range up to 360 nm NIR depth 33% resonant wavelength. configured for...
Recently, there has been much interest in the extraction of hot electrons generated from surface plasmon decay, as this process can be used to achieve additional bandwidth for both photodetectors and photovoltaics. Hot are typically injected into semiconductors over a Schottky barrier between metal semiconductor, enabling generation photocurrent with below bandgap photon illumination. As two-dimensional semiconductor single few layer molybdenum disulfide (MoS2) demonstrated exhibit internal...
Optical metasurfaces have become versatile platforms for manipulating the phase, amplitude, and polarization of light. A platform achieving independent control over each these properties, however, remains elusive due to limited engineering space available when using a single-layer metasurface. For instance, multiwavelength suffer from performance limitations filling constraints, while phase amplitude can be achieved, but only single polarization. Here, we explore bilayer dielectric expand...
Metasurfaces have recently risen to prominence in optical research, providing unique functionalities that can be used for imaging, beam forming, holography, polarimetry, and many more, while keeping device dimensions small. Despite the fact a vast range of basic metasurface designs has already been thoroughly studied literature, number metasurface-related papers is still growing at rapid pace, as research now spreading adjacent fields, including computational augmented virtual reality,...
The prevalence of computer vision systems necessitates hardware-based approaches to relieve the high computational demand deep neural networks in resource-limited applications. One solution would be off-load low-level image feature extraction, such as edge detection, from digital network analog imaging system. To that end, this work demonstrates incoherent, broadband, low-noise optical detection real-world scenes by combining wavefront shaping a 24-mm aperture metasurface with refractive...
In the emerging field of thermoplasmonics, Joule heating associated with optically resonant plasmonic structures is exploited to generate nanoscale thermal hotspots. present study, new methods for designing and thermally probing thermoplasmonic are reported. A general design rationale, based on Babinet's principle, developed understanding how complementary version ideal electromagnetic antennae can yield efficient heat sources maximized current density. Using this methodology, we show that...
We report an invisibility carpet cloak device, which is capable of making object undetectable by visible light. The designed using quasi conformal mapping and fabricated in a silicon nitride waveguide on specially developed nanoporous oxide substrate with very low refractive index (n<1.25). spatial variation realized etching holes various sizes the layer at deep subwavelength scale creating local effective medium index. device demonstrates wideband throughout spectrum loss. This can also be...
Optical metamaterials have redefined how we understand light in notable ways: from strong response to optical magnetic fields, negative refraction, fast and slow propagation zero index trapping structures, flat, thin perfect lenses. Many rules of thumb regarding optics, such as μ = 1, now an exception, basic formulas, the Fresnel equations, been expanded. The field has developed strongly over past two decades. Leveraging structured materials systems generate tailored a stimulus, it grown...
Tunable metasurfaces open new doors for achieving dynamic wavefront manipulation in an ultracompact footprint. Dielectric are particularly attractive this application due to their low-loss modes. However, volumetric modes make them difficult dynamically tune compared plasmonic variants with strong field confinement. We overcome challenge by combining dielectric resonators epsilon-near-zero (ENZ) mode a thin film. By tuning the coupling between and ENZ film, active control over transmittance...