Highly sensitive and polarization-insensitive terahertz microfluidic biosensor based on gap plasmon model

Yanyan Liang; Qixiang Zhao; You Lv; Ruiqi Lu; Jialang Ling; Hang Mo; Mengshi Ma; Yanyan Zhang; Kunshan Mo

Results in Physics (Aug 2023)

Highly sensitive and polarization-insensitive terahertz microfluidic biosensor based on gap plasmon model

Yanyan Liang,
Qixiang Zhao,
You Lv,
Ruiqi Lu,
Jialang Ling,
Hang Mo,
Mengshi Ma,
Yanyan Zhang,
Kunshan Mo

Affiliations

Yanyan Liang: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Qixiang Zhao: Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
You Lv: Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Ruiqi Lu: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Jialang Ling: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Hang Mo: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Mengshi Ma: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China
Yanyan Zhang: National Key Laboratory of Electromagnetic Space Security, Chengdu, Sichuan 611731, China
Kunshan Mo: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China; School of Electronic Information and Automation, Guilin University of Aerospace Technology, Guilin 541004, China; Corresponding author at: School of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China.

Journal volume & issue: Vol. 51
p. 106693

Abstract

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The gap plasmon resonance can generate a local enhanced electric field and make the electromagnetic field energy mostly confined in the microfluidic, thereby increasing the interaction between the detection sample and terahertz wave. In this paper, a five-layer microfluidic terahertz biosensor based on gap plasmon resonance is presented. The simulation results show that the designed biosensor can realize a resonant absorption peak with near-perfect absorption at the frequency of 0.655 THz and high refractive index sensitivity of 191.3 GHz/RIU. In addition, the biosensor possesses the characteristics of polarization insensitivity and 50° incidence angle insensitivity due to the symmetry of the metal metasurface, which make the biosensor can be widely used in the biological label-free detection, medical trace element detection.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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