- School of Physics - Research Publications
School of Physics - Research Publications
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ItemElectrical tuning of reflectance of graphene metasurface for unpolarized long wavelength infrared lightShrestha, VR ; Gao, Y ; Amani, M ; Bullock, J ; Javey, A ; Crozier, KB (OSA, 2018-01-01)We demonstrate a graphene-metal metasurface for unpolarized long wavelength infrared light with electrically-tunable reflectance. By applying a gate voltage, we shift the wavelength of a resonant reflectance dip centered at ~9.4 micron by~156 nm.
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ItemMid-infrared computational spectroscopy with an electrically-tunable graphene metasurfaceShrestha, VR ; Craig, B ; Amani, M ; Bullock, J ; Javey, A ; Crozier, KB (OSA - Optical Society of America, 2019-01-01)We demonstrate graphene-plasmonic metasurfaces whose mid-infrared reflection spectra are electrically-tunable. Using measurements of the power reflected by the metasurfaces at different drive voltages, the source spectrum is computationally reconstructed by the recursive least squares method.
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ItemLong -Wave In a ed Photodetectors Based on Platinum DiselenideAzar, NS ; Shrestha, VR ; Bullock, J ; Amani, M ; Kim, H ; Javey, A ; Crozier, KB (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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ItemVisible to Long-Wave Infrared Photodetectors based on Copper Tetracyanoquinodimethane (CuTCNQ) CrystalsBalendhran, S ; Hussain, Z ; Shrestha, VR ; Cadusch, J ; Ye, M ; Kim, H ; Ramanathan, R ; Bullock, J ; Javey, A ; Bansal, V ; Crozier, KB (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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ItemPolarization-Converting Plasmonic Nanoantennas for Light Absorption Enhancement in Anisotropic 2D Black PhosphorusAzar, NS ; Bullock, J ; Balendhran, S ; Kim, H ; Javey, A ; Crozier, KB (IEEE, 2021)Optical anisotropy and thinness of 2D black phosphorous (bP) lead to weak light absorption, which limits the performance of bP-based photodetectors. We demonstrate that T-shaped nanoantennas can be integrated with bP to overcome this issue.