Enhanced FANO Structure Based on Tip-Field-Enhancement Theory

Tianchi Zhou; Bo Zhang; Yaxin Zhang; Chao Shu; Shixiong Liang; Lan Wang; Kaijun Song

doi:10.3390/app9235009

Applied Sciences (Nov 2019)

Enhanced FANO Structure Based on Tip-Field-Enhancement Theory

Tianchi Zhou,
Bo Zhang,
Yaxin Zhang,
Chao Shu,
Shixiong Liang,
Lan Wang,
Kaijun Song

Affiliations

Tianchi Zhou: Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Bo Zhang: Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Yaxin Zhang: Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Chao Shu: School of Electronic Engineering and Computer Science, Queen Mary, University of London, London E1 4NS, UK
Shixiong Liang: National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
Lan Wang: Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Kaijun Song: Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

DOI: https://doi.org/10.3390/app9235009
Journal volume & issue: Vol. 9, no. 23
p. 5009

Abstract

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High-Q metasurfaces have attracted much interest owing to their potential application in biological sensors. FANO is a type of high-Q factor metasurface. However, it is difficult to achieve large resonant intensity and a high-Q factor at the same time. In this paper, by sharpening the tips of the asymmetrical split-ring FANO structure and letting more charges stack at the tips to enhance tip coupling, the Q factor was significantly improved without sacrificing too much resonant intensity. Simulation results showed that the Q factor increased up to 2.4 times, while the resonant intensity stayed higher than 20 dB, and the experiment results agreed with the simulations. This indicated that the tip-field-enhancement theory can be applied in time-harmonic electromagnetic-fields, and the method proposed here can be used to increase the sensitivity and accuracy of microfluidic sensors. Additionally, other types of research, such as on antenna design, could benefit from this theory.

Published in Applied Sciences

ISSN: 2076-3417 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Engineering (General). Civil engineering (General); Science: Biology (General); Science: Physics; Science: Chemistry
Website: http://www.mdpi.com/journal/applsci

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