Browsing by Author "Ghobadi, Amir"
Now showing items 1-20 of 62
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Active metamaterial nearly perfect light absorbers: A review [Invited]
(Optical Society of America, 2019)Achieving nearly perfect light absorption from the microwave to optical region utilizing metamaterials has begun to play a significant role in photonics and optoelectronics due to their vital applications in thermal emitters, ... -
Adaptive thermal camouflage using sub-wavelength phase-change metasurfaces
(Institute of Physics Publishing Ltd., 2022-12-09)Sub-wavelength metasurface designs can be used to artificially engineer the spectral thermal signature of an object. The real-time control of this emission can provide the opportunity to switch between radiative cooling ... -
Adaptive visible and short-wave infrared camouflage using a dynamically tunable metasurface
(Optica, 2021-10-01)In this Letter, a dynamically tunable metasurface, which is based on antimony trisulfide, is introduced. In this struc ture, first a metal-insulator-metal (MIM) nanocavity is optimized in a way that, upon phase change, ... -
All ceramic-based metal-free ultra-broadband perfect absorber
(Springer, 2019-06)In this paper, we scrutinize unprecedented potential of transition metal carbides (TMCs) and nitrides (TMNs) for realization of light perfect absorption in an ultra-broad frequency range encompassing all of the visible ... -
An all-dielectric metasurface coupled with two-dimensional semiconductors for thermally tunable ultra-narrowband light absorption
(Springer, 2020)Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted tremendous attention over the past decades. Due to their unique features such as high mobility and direct bandgap, they are suitable candidate ... -
Angstrom thick ZnO passivation layer to improve the photoelectrochemical water splitting performance of a TiO 2 nanowire photoanode: The role of deposition temperature
(Nature Publishing Group, 2018)In this paper, we demonstrate that angstrom thick single atomic layer deposited (ALD) ZnO passivation can signifcantly improve the photoelectrochemical (PEC) activity of hydrothermally grown TiO2 NWs. It is found that this ... -
Bismuth plasmonics for extraordinary light absorption in deep sub-wavelength geometries
(OSA - The Optical Society, 2020)In this Letter, we demonstrate an ultra-broadband metamaterial absorber of unrivaled bandwidth (BW) using extraordinary optical response of bismuth (Bi), which is the material selected through our novel analysis. Based on ... -
Bismuth-based metamaterials: From narrowband reflective color filter to extremely broadband near perfect absorber
(De Gruyter, 2019)In recent years, sub-wavelength metamaterials-based light perfect absorbers have been the subject of many studies. The most frequently utilized absorber configuration is based on nanostructured plasmonic metals. However, ... -
Colorimetric and near-absolute polarization-insensitive refractive-index sensing in all-dielectric guided-mode resonance based metasurface
(American Chemical Society, 2019)Colorimetric detection of target molecules with insensitivity to incident-light polarization has attracted considerable attention in recent years. This resulted from the ability to provide rapid output and reduced assay ... -
Correction to: Active tuning from narrowband to broadband absorbers using a sub-wavelength VO2 embedded layer
(Springer, 2021-02-04)Metamaterial perfect absorbers (MPAs) with dynamic thermal tuning features are able to control the absorption performance of the resonances, providing diverse applications spanning from optical switches and filters to ... -
Corrigendum: Building an iron chromophore incorporating prussian blue analogue for photoelectrochemical water oxidation
(Wiley-VCH Verlag GmbH & Co. KGaA, 2021-09-20)The replacement of traditional ruthenium-based photosensitizers with low-cost and abundant iron analogs is a key step for the advancement of scalable and sustainable dye-sensitized water splitting cells. In this proof-of-concept ... -
Deep subwavelength light confinement in disordered bismuth nanorods as a linearly thermal‐tunable metamaterial
(Wiley-VCH Verlag, 2020)Materials with a tunable optical response that can be controllably tailored using external stimuli excitation have undergone considerable research effort for the development of active optical devices, such as thermo‐optical ... -
Diode like high-contrast asymmetric transmission of linearly polarized waves based on plasmon-tunneling effect coupling to electromagnetic radiation modes
(Institute of Physics Publishing Ltd., 2021-06-25)We present a narrow-band optical diode with a high-contrast forward-to-backward ratio at the near-infrared region. The design has a forward transmission of approximately $88\% $, and a backward one of less than $3\% $, ... -
Disordered and densely packed ITO nanorods as an excellent lithography-free optical solar reflector metasurface
(American Chemical Society, 2019)Precise control and stabilization of the operating temperature environment of spacecraft and satellites during their life cycle is of paramount importance to increase device reliabilities and reduce the thermomechanical ... -
Disordered and densely packed ITO nanorods as an excellent lithography-free optical solar reflector metasurface for the radiative cooling of spacecraft
(SPIE, 2019)Optical Solar Reflectors (OSRs) form the physical interface between the spacecraft and space and they are essential for the stabilization and uniform distribution of temperature throughout the spacecraft. OSRs need to ... -
Emerging photoluminescence from defective vanadium diselenide nanosheets
(OSA - The Optical Society, 2018)In this paper, for the first time to our knowledge in the literature, we demonstrate photoluminescence from two-dimensional (2D) vanadium diselenide (VSe2) nanosheets (NSs). The preparation of these nanostructures is carried ... -
Fano resonance in a dolomite phase-change multilayer design for dynamically tunable omnidirectional monochromatic thermal emission
(Optica, 2022)In this Letter, we unveil the unprecedented optical phonon response of CaMg(CO3)2 (dolomite) thin film in the design of a planar ultra-narrowband mid-infrared (MIR) thermal emitter. Dolomite (DLM) is a carbonate mineral ... -
Generation of additive colors with near unity amplitude using a multilayer tandem Fabry–Perot cavity
(Optica, 2021-07)In this paper, the generation of additive red-green-blue (RGB) colors in reflectance mode with near unity amplitude is demonstrated. For this purpose, a multilayer structure made of metal–insulator–metal–semiconductor ... -
Highly efficient semiconductor-based metasurface for photoelectrochemical water splitting: broadband light perfect absorption with dimensions smaller than the diffusion length
(Springer, 2020)In this paper, we demonstrate a highly efficient light trapping design that is made of a metal-oxide-semiconductor-semiconductor (nanograting/nanopatch) (MOSSg/p) four-layer design to absorb light in a broad wavelength ... -
Highly one-way electromagnetic wave transmission based on outcoupling of surface plasmon polaritons to radiation modes
(Institute of Electrical and Electronics Engineers, 2022-09-21)Unidirectional transmission of electromagnetic waves has attracted great interest due to its wide modern optical applications. This study theoretically demonstrates a one-way transmissive optical device with a ...
