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Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials

Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials
Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials

THz molecular fingerprint sensing is a promising non-destructive method to accurately detect ultra-thin carbon-based materials in the nanoscale. Due to their extremely low THz absorption, plasmonic metamaterials or all-dielectric metasurfaces have been adopted to enhance the light-matter interaction for detection. However, they cause considerable parasitic losses or complicated material processing on a patterned surface. Here, we propose a lithography-free all-dielectric sensor to enhance THz absorption via an evanescent wave, which can lead to high detecting performance by a coupled mode. In view of the molecular broadband features, we use a thickness-multiplexed scheme to boost the detection of fingerprint significantly. The enhancing factor for the minimum fluctuation of fingerprint feature points is up to 534. Our method drastically enhances the broadband fingerprint intensity of the ultra-thin nanoscale layer and make it comparable to that of a 700-times thick sample layer, measured with a regular approach. Our study paves the way for broadband THz fingerprint sensing of trace-amount analytes and will inspire many burgeoning THz detection applications on 2D or ultra-thin carbon-based nanomaterials.

2D materials, High-order modes, Perfect absorption, Surface wave, THz fingerprint sensing, Trace-amount detection
0008-6223
666-676
Ding, Shan
9f4c24f6-b96e-41d1-9c00-556cc5ed911d
Ou, Jun Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Du, Lianghui
b6c5bd24-4ecd-400c-a330-4ddf6242dfa4
Zhu, Liguo
69a463c3-6422-44c3-aa0d-58bc5446f1da
Khan, Sayed Ali
5ef346e7-9243-4f4d-97c5-f4ab6c0b9609
Chen, Huanyang
b1a8fc79-6811-4435-bbbe-f952be04eff2
Zhu, Jinfeng
2196d879-479e-459d-9f27-7cafdafb2018
Ding, Shan
9f4c24f6-b96e-41d1-9c00-556cc5ed911d
Ou, Jun Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Du, Lianghui
b6c5bd24-4ecd-400c-a330-4ddf6242dfa4
Zhu, Liguo
69a463c3-6422-44c3-aa0d-58bc5446f1da
Khan, Sayed Ali
5ef346e7-9243-4f4d-97c5-f4ab6c0b9609
Chen, Huanyang
b1a8fc79-6811-4435-bbbe-f952be04eff2
Zhu, Jinfeng
2196d879-479e-459d-9f27-7cafdafb2018

Ding, Shan, Ou, Jun Yu, Du, Lianghui, Zhu, Liguo, Khan, Sayed Ali, Chen, Huanyang and Zhu, Jinfeng (2021) Enhancing ultra-wideband THz fingerprint sensing of unpatterned 2D carbon-based nanomaterials. Carbon, 179, 666-676. (doi:10.1016/j.carbon.2021.04.084).

Record type: Article

Abstract

THz molecular fingerprint sensing is a promising non-destructive method to accurately detect ultra-thin carbon-based materials in the nanoscale. Due to their extremely low THz absorption, plasmonic metamaterials or all-dielectric metasurfaces have been adopted to enhance the light-matter interaction for detection. However, they cause considerable parasitic losses or complicated material processing on a patterned surface. Here, we propose a lithography-free all-dielectric sensor to enhance THz absorption via an evanescent wave, which can lead to high detecting performance by a coupled mode. In view of the molecular broadband features, we use a thickness-multiplexed scheme to boost the detection of fingerprint significantly. The enhancing factor for the minimum fluctuation of fingerprint feature points is up to 534. Our method drastically enhances the broadband fingerprint intensity of the ultra-thin nanoscale layer and make it comparable to that of a 700-times thick sample layer, measured with a regular approach. Our study paves the way for broadband THz fingerprint sensing of trace-amount analytes and will inspire many burgeoning THz detection applications on 2D or ultra-thin carbon-based nanomaterials.

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More information

Accepted/In Press date: 25 April 2021
e-pub ahead of print date: 29 April 2021
Published date: July 2021
Additional Information: NSAF Joint Fund (U1830116); Fujian Provincial Department of Science and Technology (2020J06009); Fundamental Research Funds for the Central Universities (20720190010); Natural Science Foundation of Guangdong Province (2018A030313299).
Keywords: 2D materials, High-order modes, Perfect absorption, Surface wave, THz fingerprint sensing, Trace-amount detection

Identifiers

Local EPrints ID: 471351
URI: http://eprints.soton.ac.uk/id/eprint/471351
ISSN: 0008-6223
PURE UUID: 5c3075ec-5f58-421d-a35e-a82b89e700f9
ORCID for Jun Yu Ou: ORCID iD orcid.org/0000-0001-8028-6130

Catalogue record

Date deposited: 03 Nov 2022 17:58
Last modified: 06 Jun 2024 01:49

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Contributors

Author: Shan Ding
Author: Jun Yu Ou ORCID iD
Author: Lianghui Du
Author: Liguo Zhu
Author: Sayed Ali Khan
Author: Huanyang Chen
Author: Jinfeng Zhu

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