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

Author:

Yao Hsin-Yu1,Wang Yi-Chen2,HadavandMirzaee Fatemeh,Chang Tsun-Hsu2,Her Tsing-HuaORCID

Affiliation:

1. National Chung Cheng University

2. National Tsing Hua University

Abstract

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.

Funder

National Science and Technology Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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