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Mode coupling with Fabry-Perot modes in photonic crystal slabs |
| Ken Qin(秦恳)1, Peng Hu(胡鹏)2, Jie Liu(刘杰)1, Hong Xiang(向红)1,†, and De-Zhuan Han(韩德专)1,‡ |
1 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China;
2 School of Science, Chongqing Key Laboratory of New Energy Storage Materials and Devices, Chongqing University of Technology, Chongqing 400054, China |
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Abstract Fabry-Perot (FP) modes are a class of fundamental resonances in photonic crystal (PhC) slabs. Owing to their low quality factors, FP modes are frequently considered as background fields with their resonance nature being neglected. Nevertheless, FP modes can play important roles in some phenomena, as exemplified by their coupling with guided resonance (GR) modes to achieve bound states in the continuum (BIC). Here, we further demonstrate the genuine resonance mode capability of FP modes PhC slabs. Firstly, we utilize temporal coupled-mode theory to obtain the transmittance of a PhC slab based on the FP modes. Secondly, we construct exceptional points (EPs) in both momentum and parameter spaces through the coupling of FP and GR modes. Furthermore, we identify a Fermi arc connecting two EPs and discuss the far-field polarization topology. This work elucidates that the widespread FPs in PhC slabs can serve as genuine resonant modes, facilitating the realization of desired functionalities through mode coupling.
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Received: 13 April 2024
Revised: 22 May 2024
Accepted manuscript online: 24 May 2024
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PACS:
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42.25.Ja
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(Polarization)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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| Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 12074049 and 12347101). |
Corresponding Authors:
Hong Xiang, De-Zhuan Han
E-mail: xhong@cqu.edu.cn;dzhan@cqu.edu.cn
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Cite this article:
Ken Qin(秦恳), Peng Hu(胡鹏), Jie Liu(刘杰), Hong Xiang(向红), and De-Zhuan Han(韩德专) Mode coupling with Fabry-Perot modes in photonic crystal slabs 2024 Chin. Phys. B 33 084205
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