Romil Audhkhasi
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View article: Compact broadband thermal absorbers based on plasmonic fractal metasurfaces
Compact broadband thermal absorbers based on plasmonic fractal metasurfaces Open
The ability to efficiently absorb thermal radiation within a small material volume is crucial for the realization of compact and high spatial resolution thermal imagers. Here we propose and experimentally demonstrate a compact plasmonic me…
View article: Singleshot Multispectral Imaging via a Chromatic Metalens Array
Singleshot Multispectral Imaging via a Chromatic Metalens Array Open
Real time, singleshot multispectral imaging systems are crucial for environment monitoring and biomedical imaging. Most singleshot multispectral imagers rely on complex computational backends, which precludes real time operations. In this …
View article: Statistics dependent spectral properties of random arrays of particles
Statistics dependent spectral properties of random arrays of particles Open
The ability to tailor the spectral response of photonic devices is paramount to the advancement of a broad range of applications. The vast design space offered by disordered optical media provide enhanced functionality for spectral tailori…
View article: Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector
Full Spectral Image Encryption in the Infrared using an Electrically Reconfigurable Metasurface and a Matched Detector Open
The ability of metasurfaces to manipulate optical waves in the spatial and spectral domain provides new avenues for secure data storage. In this work, an encryption system consisting of an electrically tunable metasurface and a matched det…
View article: Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared
Experimental Implementation of Metasurfaces for Secure Multi‐Channel Image Encryption in the Infrared Open
The ability to tailor light–matter interactions using artificially engineered materials has opened up new avenues for secure data storage and communication. This work presents an experimental investigation of metasurfaces for secure, multi…
View article: Dynamically switchable self-focused thermal emission
Dynamically switchable self-focused thermal emission Open
The ability to manipulate thermal emission is paramount to the advancement of a wide variety of fields such as thermal management, sensing and thermophotovoltaics. In this work, we propose a microphotonic lens for achieving temperature-swi…
View article: Using tunable inter-resonator coupling to reshape the mid-infrared absorption spectrum of graphene-based metamaterials
Using tunable inter-resonator coupling to reshape the mid-infrared absorption spectrum of graphene-based metamaterials Open
We explore the use of tunable inter-resonator coupling to reshape the spectral absorptivity of a graphene-based metamaterial. The metamaterial comprises of a periodic array of coupled metal-insulator-metal resonators, with two resonators p…
View article: Generalized multi-channel scheme for secure image encryption
Generalized multi-channel scheme for secure image encryption Open
The ability of metamaterials to manipulate optical waves in both the spatial and spectral domains has provided new opportunities for image encoding. Combined with the recent advances in hyperspectral imaging, this suggests exciting new pos…
View article: Gold-black phosphorus nanostructured absorbers for efficient light trapping in the mid-infrared
Gold-black phosphorus nanostructured absorbers for efficient light trapping in the mid-infrared Open
We propose a gold nanostructured design for absorption enhancement in thin black phosphorus films in the 3–5 µm wavelength range. By suitably tuning the design parameters of a metal-insulator-metal (MIM) structure, lateral resonance modes …
View article: Spectral emissivity design using aluminum-based hybrid gratings
Spectral emissivity design using aluminum-based hybrid gratings Open
We propose a strategy to design infrared emitters with predefined spectral response using aluminum gratings as building blocks. We begin by identifying 3 target spectra with resonances in the 7–15 µm wavelength range. Next, we use FDTD sim…