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Photocurrent detection of radially polarized optical vortex with hot electrons in Au/GaN

Yaonan Hou, Menno Kappers, Chaoyuan Jin, Rachel Oliver Orcid Logo

Applied Physics Letters, Volume: 120, Issue: 20, Start page: 424004

Swansea University Author: Yaonan Hou

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DOI (Published version): 10.1063/5.0094454

Abstract

We report a GaN based metal–semiconductor–metal (MSM) infrared photodetector enabled with azimuthally distributed sub-wavelength gratings fabricated on one of the working electrodes. Under illumination, hot electron transfer is introduced by the plasmonic resonance in the infrared waveband formed at...

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Published in: Applied Physics Letters
ISSN: 0003-6951 1077-3118
Published: AIP Publishing 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa65280
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Abstract: We report a GaN based metal–semiconductor–metal (MSM) infrared photodetector enabled with azimuthally distributed sub-wavelength gratings fabricated on one of the working electrodes. Under illumination, hot electron transfer is introduced by the plasmonic resonance in the infrared waveband formed at the interface of Au/GaN. Without the help of using any external optical polarizers, the device is able to detect radial polarization vortices in the form of photocurrents with a prescribed response spectrum. The detector exhibits a 10%–90% rise and fall time of 0.9 ms under modulated light, much faster than that of conventional ultraviolet GaN MSM photodetectors based on the band edge absorption. This work provides a viable way to measure spatially variant polarization beams with a compact plasmonic photodetectors fabricated from wide bandgap semiconductors.
College: Faculty of Science and Engineering
Funders: Y.H. and C.J. are grateful for the support by Research Stimulus Fund at the Zepler Institute for Photonics and Nanoelectronics, the University of Southampton. This work was partly supported by QUantum Dot On Silicon systems for communications, information processing and sensing (QUDOS) under the Grant No. EP/T028475/1 from Engineering and Physical Sciences Research Council (EPSRC), UK. Y.H., M.K., and R.O. appreciate the Pumppriming Program from EPSRC National Epitaxy Facility, UK. Y.H. specially thanks Dr. Nikitas Papasimkis and Professor Nikolay I. Zheludev from University of Southampton for helpful discussions.
Issue: 20
Start Page: 424004

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