Mechanism and tuning sensitivity of symmetry-protected resonances in high-contrast gratings

We develop a theory of refractive index tuning for symmetry-protected optical bound states (SP-BICs) in high-contrast gratings (HCGs). A compact analytical formula for tuning sensitivity is derived and verified numerically. We also discover a new type of SP-BIC in HCGs that has an accidental nature...

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Published inOptics express Vol. 31; no. 12; pp. 20092 - 20101
Main Authors Yao, Hsin-Yu, Wang, Yi-Chen, HadavandMirzaee, Fatemeh, Chang, Tsun-Hsu, Her, Tsing-Hua
Format Journal Article
LanguageEnglish
Published United States 05.06.2023
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Summary:We develop a theory of refractive index tuning for symmetry-protected optical bound states (SP-BICs) in high-contrast gratings (HCGs). A compact analytical formula for tuning sensitivity is derived and verified numerically. We also discover a new type of SP-BIC in HCGs that has an accidental nature with a spectral singularity, which is explained in terms of hybridization and strong coupling among the odd- and even-symmetric waveguide-array modes. Our work elucidates the physics of tuning SP-BICs in HCGs and significantly simplifies their design and optimization for dynamic applications in light modulation, tunable filtering, and sensing.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.488596