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Hot-electron photocurrent detection of near-infrared light based on ZnO

Yaonan Hou, H. Liang, A. Tang Orcid Logo, X. Du, Z. Mei

Applied Physics Letters, Volume: 118, Issue: 6

Swansea University Author: Yaonan Hou

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DOI (Published version): 10.1063/5.0031719

Abstract

We demonstrate an unconventional near-infrared photodetector fabricated from a ZnO chip with a metallic subwavelength grating structure as a contact and optical window, which harvests hot electrons generated by plasmonic resonances introduced by incident light. The grating structure has a strong sel...

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Published in: Applied Physics Letters
ISSN: 0003-6951 1077-3118
Published: AIP Publishing 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa65285
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Abstract: We demonstrate an unconventional near-infrared photodetector fabricated from a ZnO chip with a metallic subwavelength grating structure as a contact and optical window, which harvests hot electrons generated by plasmonic resonances introduced by incident light. The grating structure has a strong selection of the polarization of incident light, meaning that the detector is naturally polarization-sensitive. In our device, the polarization extinction ratio is as high as 64:1, much higher than that relying on crystal orientations. Since the photoresponse is introduced by plasmonic resonance, a narrow photoresponse spectrum with a linewidth of 32.1 nm at 1.201 μm is obtained. By simply changing the grating period, the spectral position can be tailored freely within the near-infrared region, i.e., wavelength-selective. Such a spectral response is not likely to be realized with conventional semiconductor photodetectors, which depend on the band edge absorption. We propose a modified Fowler's model, which well explains the line shape of photoresponse spectra of such devices.
College: Faculty of Science and Engineering
Issue: 6

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