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

Hot-electron photocurrent detection of near-infrared light based on ZnO
Hot-electron photocurrent detection of near-infrared light based on ZnO
We demonstrate an unconventional near infrared photodetector fabricated from a ZnO chip with a metallic subwavelength grating structure as 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.
0003-6951
Hou, Yaonan
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Liang, H.
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Tang, A.
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Du, X.
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Mei, Z.
f1dde607-a0d8-434f-ba4a-189cd97d998b
Hou, Yaonan
21cd6d93-63f2-4c1d-8297-6cce6bc7a772
Liang, H.
a67d00dd-b439-4806-9ac0-ac7644732b4b
Tang, A.
ad5e8758-9f11-43eb-8137-7fd9cf4536a1
Du, X.
19b05560-949a-4fbb-b6b6-193a5aafebdd
Mei, Z.
f1dde607-a0d8-434f-ba4a-189cd97d998b

Hou, Yaonan, Liang, H., Tang, A., Du, X. and Mei, Z. (2021) Hot-electron photocurrent detection of near-infrared light based on ZnO. Applied Physics Letters. (In Press)

Record type: Article

Abstract

We demonstrate an unconventional near infrared photodetector fabricated from a ZnO chip with a metallic subwavelength grating structure as 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.

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Hot-electron photocurrent detection of near-infrared light based on ZnO - Accepted Manuscript
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Accepted/In Press date: 25 January 2021

Identifiers

Local EPrints ID: 448958
URI: http://eprints.soton.ac.uk/id/eprint/448958
ISSN: 0003-6951
PURE UUID: 048cae27-1e1f-410a-8cf6-bc62c64cdc6f

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Date deposited: 11 May 2021 17:12
Last modified: 16 Mar 2024 12:03

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Contributors

Author: Yaonan Hou
Author: H. Liang
Author: A. Tang
Author: X. Du
Author: Z. Mei

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