Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces

Chloe F. Doiron (), Igal Brener and Alexander Cerjan ()
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Chloe F. Doiron: Center for Integrated Nanotechnologies, Sandia National Laboratories
Igal Brener: Center for Integrated Nanotechnologies, Sandia National Laboratories
Alexander Cerjan: Center for Integrated Nanotechnologies, Sandia National Laboratories

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Bound states in the continuum (BICs) have received significant attention for their ability to enhance light-matter interactions across a wide range of systems, including lasers, sensors, and frequency mixers. However, many applications require degenerate or nearly degenerate high-quality factor (Q) modes, such as spontaneous parametric down conversion, non-linear four-wave mixing, and intra-cavity difference frequency mixing for terahertz generation. Previously, degenerate pairs of bound states in the continuum (BICs) have been created by fine-tuning the structure to engineer the degeneracy, yielding BICs that respond unpredictably to structure imperfections and material variations. Instead, using a group theoretic approach, we present a design paradigm based on six-fold rotational symmetry (C6) for creating degenerate pairs of symmetry-protected BICs, whose frequency splitting and Q-factors can be independently and predictably controlled, yielding a complete design phase space. Using a combination of resonator and lattice deformations in silicon metasurfaces, we experimentally demonstrate the ability to tune mode spacing from 2 nm to 110 nm while simultaneously controlling Q-factor.

Date: 2022
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DOI: 10.1038/s41467-022-35246-w

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