Terahertz plasmonic phase-jump manipulator for liquid sensing

Huang, Yi, Zhong, Shuncong, Shi, Tingting, Shen, Yao-chun ORCID: 0000-0002-8915-1993 and Cui, Daxiang (2020) Terahertz plasmonic phase-jump manipulator for liquid sensing. Nanophotonics, 9 (9). pp. 3011-3021.

Text Nanophotonics-Terahertz Plasmonic Phase-Jump Manipulator for Liquid Sensing-Final.docx - Author Accepted Manuscript Download (3MB)

Abstract

Terahertz (THz) plasmonic sensors has been regarded as exciting advances in biomedical engineering, due to their real-time, label-free, and ultrasensitive monitoring features. But actually, its widespread application remains impeded by poor modulation properties of operating frequency, single amplitude characterization method, and limited to low-loss substances. In the work, an ultraprecision THz sensor is achieved with direct phase readout capacity via combining steerable plasmonic resonance and attenuated total reflection. Interestingly, the oft-neglected THz phase were found to be ideal for plasmonic sensing characterization. Detailed investigation shows that the reflected THz phase exhibits two entirely different jump responses to coupling gap. Remarkably, the Q-factor of phase spectra for optimal coupling gaps, are generally higher than that of fixed coupling gaps, which falls within the range of 9.7–43.4 (4–26 times higher than its counterpart in amplitude measurements) in liquids sensing. The unique phase-jump responses on metasurfaces pave the way for novel THz sensing methods.

Item Type:	Article
Uncontrolled Keywords:	attenuated total reflection, phase jump, steerable plasmonic resonance, Terahertz plasmonic sensor
Depositing User:	Symplectic Admin
Date Deposited:	25 Aug 2020 07:28
Last Modified:	18 Jan 2023 23:36
DOI:	10.1515/nanoph-2020-0247
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3098688