Terahertz asymmetric metallic hole arrays with polarization-independent quasi-bound states in the continuum for membrane sensing

Author:

Liu Dejun1ORCID,Yu Xi2,Wu Feng3ORCID,Du Weijie1,Chen Lin4ORCID,Liu Feng1ORCID,Kuwahara Makoto5,Ono Shingo6

Affiliation:

1. Shanghai Normal University

2. Tokyo University of Science

3. Guangdong Polytechnic Normal University

4. University of Shanghai for Science and Technology

5. Nagoya University

6. Nagoya Institute of Technology

Abstract

Resonances with both high-quality factor and polarization-independent characteristics are highly desirable for terahertz (THz) sensing. Here, THz sensors based on asymmetric metallic hole arrays (AMHAs) are experimentally demonstrated. Such sensors consisting of four-hole arrays support polarization-independent quasi-bound states in the continuum (BICs). The induced quasi-BIC presents a quality factor exceeding 2000, which enables enhanced sensing for thin membranes. Results show that the frequency shift is 97.5 GHz for the 25-µm thick polyimide (PI), corresponding to a sensitivity of 147.7 GHz/RIU. The sensing performance strongly relates to the enhanced field originating from sharp quasi-BICs. A maximum field enhancement of 15.88 in contrast to the incident field is achieved. When the PI thickness is large than the decay length of enhanced fields, the interaction strength of field-PI becomes weak, resulting in a saturation effect for the shift of quasi-BICs. The proposed sensor possessing polarization-independent quasi-BICs has great potential for practical sensing applications in real-time chemical and biomolecular.

Funder

National Natural Science Foundation of China

Shanghai Pujiang Program

Science and Technology Commission of Shanghai Municipality

Shanghai Municipal Education Commission

Program of Shanghai Academic Research Leader

Hirose Foundation

Amada Foundation

Iketani Science and Technology Foundation

KAKENHI

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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