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Volume 13
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Article

A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum

by
Chaolong Li
1,
Hongbo Cheng
2,
Xin Luo
1,3,*,
Ziqiang Cheng
1 and
Xiang Zhai
4
1
School of Science, East China Jiaotong University, Nanchang 330013, China
2
Science and Technology on Aerospace Chemical Power Laboratory, Hubei Institute of Aerospace Chemotechnology, Xiangyang 441003, China
3
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
4
Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
*
Author to whom correspondence should be addressed.
Micromachines 2022, 13(11), 1945; https://doi.org/10.3390/mi13111945
Submission received: 15 October 2022 / Revised: 2 November 2022 / Accepted: 8 November 2022 / Published: 10 November 2022
(This article belongs to the Special Issue Microwave Antennas and Metasurface Antenna: From Fundamental Research to Applications)
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Abstract

In this paper, we combine the dielectric metasurface with monolayer graphene to realize a high quality(Q)-factor quasi-BIC-based optical modulator, and the corresponding modulation performances are investigated by using the finite-difference time-domain (FDTD) method, which can be well fitting by the Fano formula based on the temporal couple-mode theory. The results demonstrate that bound states in the continuum (BIC) will turn into the quasi-BIC with high Q-factor by breaking the symmetry of every unit of the metasurface. Meanwhile, the amplitude and bandwidth of transmission based on the quasi-BIC mode can be efficiently adjusted by changing the Fermi energy (EF) of monolayer graphene, and the maximum difference in transmission up to 0.92 is achieved. Moreover, we also discuss the influence of the asymmetry degree to further investigate the modulation effect of graphene on the quasi-BIC mode.
Keywords: bound states in the continuum; metasurface; graphene bound states in the continuum; metasurface; graphene

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MDPI and ACS Style

Li, C.; Cheng, H.; Luo, X.; Cheng, Z.; Zhai, X. A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum. Micromachines 2022, 13, 1945. https://doi.org/10.3390/mi13111945

AMA Style

Li C, Cheng H, Luo X, Cheng Z, Zhai X. A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum. Micromachines. 2022; 13(11):1945. https://doi.org/10.3390/mi13111945

Chicago/Turabian Style

Li, Chaolong, Hongbo Cheng, Xin Luo, Ziqiang Cheng, and Xiang Zhai. 2022. "A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum" Micromachines 13, no. 11: 1945. https://doi.org/10.3390/mi13111945

APA Style

Li, C., Cheng, H., Luo, X., Cheng, Z., & Zhai, X. (2022). A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum. Micromachines, 13(11), 1945. https://doi.org/10.3390/mi13111945

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