Electrical and Electronic Engineering - Research Publications
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ItemAlgorithmic Spectral Reconstruction Using Angularly Tuned Zero-Contrast Gratings(IEEE, 2020)We experimentally demonstrate the algorithmic reconstruction of the infrared transmission spectrum of a polymer using a zero-contrast waveguide-grating metasurface as a filter. By changing the metasurface angle, a variety of filter functions are obtained.
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ItemGeometric Phase Metasurface Hologram for Optical Tractor Beam Generation(OSA & IEEE, 2020-01-01)We present a geometric phase silicon metasurface hologram design intended to produce a non-diffracting solenoid beam. Such optical beams have been shown to exert long range retrograde (i.e. toward source) optical forces on light-scattering particles.
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ItemLong -Wave In a ed Photodetectors Based on Platinum Diselenide(IEEE, 2020)We demonstrate long wave infrared photodetectors based on the transition metal dichalcogenide platinum diselenide (PtSe2) in its bulk form for the first time to our knowledge. Fabricated devices show sub-millisecond response times.
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ItemPolarization State Generation and Detection by VCSELs with Integrated Metasurfaces(OSA & IEEE, 2020-01-01)We experimentally demonstrate vertical-cavity surface-emitting lasers (VCSEL) with integrated plasmonic and dielectric metasurfaces. The metasurfaces shape the polarization of the laser emission from the VCSELs and also enable them to serve as polarization-dependent photodetectors.
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ItemSmartphone-based Optical Fiber Speckle Spectrometer(IEEE, 2020)We demonstrate a spectrometer that uses a smaityhone to image the speckle pattern produced by a multimode optical fiber. A smarjihone-based algorithm uses the measured pattern and a calibration library to determine the input spectnrm.
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ItemVisible to Long-Wave Infrared Photodetectors based on Copper Tetracyanoquinodimethane (CuTCNQ) Crystals(OSA - Optical Society of America, 2020-08-01)We demonstrate room-temperature photodetectors at wavelengths from visible (450 nm, 532 nm) to near- (850 nm), short-wave (1550 nm), mid-wave (4.5 \mu m) and long-wave (8.35 \mu m) infrared. These are based on drop-cast Cu TCNQ crystals.
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ItemMaterial identification with a filter array-detector array infrared microspectrometer: Numerical study(Optica Publishing Group, 2020-09-14)We design a plasmonic filter array for a filter array-detector array microspectrometer. We perform numerical experiments, including noise, that predict that this configuration would enable the identification of various materials via their infrared fingerprints.