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Open AccessArticle

Enhanced FANO Structure Based on Tip-Field-Enhancement Theory

1
Terahertz Science Cooperative Innovation Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2
School of Electronic Engineering and Computer Science, Queen Mary, University of London, London E1 4NS, UK
3
National Key Laboratory of Application Specific Integrated Circuit, Hebei Semiconductor Research Institute, Shijiazhuang 050051, China
*
Authors to whom correspondence should be addressed.
Tianchi Zhou and Bo Zhang are co-first authors.
Appl. Sci. 2019, 9(23), 5009; https://doi.org/10.3390/app9235009
Received: 11 October 2019 / Revised: 17 November 2019 / Accepted: 18 November 2019 / Published: 21 November 2019
(This article belongs to the Special Issue Photonic Crystals for Electromagnetic Applications)
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. View Full-Text
Keywords: metasurface; FANO; tip field enhancement theory; Q factor; resonant intensity metasurface; FANO; tip field enhancement theory; Q factor; resonant intensity
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MDPI and ACS Style

Zhou, T.; Zhang, B.; Zhang, Y.; Shu, C.; Liang, S.; Wang, L.; Song, K. Enhanced FANO Structure Based on Tip-Field-Enhancement Theory. Appl. Sci. 2019, 9, 5009.

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