Affiliation:
1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2. School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China
Abstract
Based on the ideas of modulation of multiple BICs, ultrahigh Q-factor resonance has been realized by array of planar metasurfaces with H-shaped nanoholes, perforated on a Si3N4 photonic crystal slab surrounded by a silica medium. Multiple BICs of both at Γ BICs and off Γ BICs are obtained. Two BICs at the Γ point show up in the lower band of the visible light, and they can be tuned by the center position and hole size of each part of the H-shaped, the refractive index of the surrounding medium, and the lattice constant. In detail, they move apart from each other or shift together with a fixed distance, with the structure parameters changing. On the other hand, the off Γ BICs behave only in the form of monotonously shifting. The at Γ BICs transform from BICs to quasi-BICs obviously with the broken symmetry of the H-shaped nanohole; however, its influence on off Γ BICs is insignificant. BICs in both types are ultra-sensitive to the surrounding medium, and the Q-factor of the BICs reaches a value more than 106. The results here are helpful in the design of photonic filters and sensors.
Funder
Hunan Provincial Natural Science Foundation of China
National Natural Science Foundation of China
Program of Foundation of Science and Technology Commission of Shanghai Municipality
Natural Science Foundation of Shanghai
Horizontal Scientific Research Project
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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