Abstract
We demonstrate by breaking the symmetry for higher-order at- bound states in the continuum (BICs) with topological charge in photonic crystals (i) deterministic generation of off- BICs from the at- BIC and (ii) a variety of pair-creation and annihilation processes of circularly polarized states with opposite topological charges and the same handedness. To explain these phenomena, we introduce the handedness-wise topological charge quantized to a half-integer. The handedness-wise charge gives a unified picture of various phenomena involving BICs and circularly polarized states.
- Received 23 January 2020
- Accepted 22 June 2020
- Corrected 20 January 2021
DOI:https://doi.org/10.1103/PhysRevLett.125.053902
© 2020 American Physical Society
Physics Subject Headings (PhySH)
Corrections
20 January 2021
Correction: A byline footnote has been added for the second author.