Degenerate bound states in the continuum in square and triangular open acoustic resonators

Autor:	Almas Sadreev, Evgeny Bulgakov, Artem Pilipchuk, Andrey Miroshnichenko, Lujun Huang
Rok vydání:	2022
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Physical sciences
Zdroj:	Physical Review B. 106
ISSN:	2469-9969 2469-9950
DOI:	10.1103/physrevb.106.085404
Popis:	We consider square and equilateral triangular open acoustic resonators with the $C_{4v}$ and $C_{3v}$ symmetries, respectively. There is an unique property of square and triangular resonators of accidental number four-fold degeneracy of eigenstates that gives rise to two-fold degenerate Friedrich-Wintgen (FW) BICs. Compared to usual FW BICs the degenerate FW BICs maintain high $Q$-factor in wide range of the size of resonators. That removes the fabrication difficulties of proper choice of resonator. The presence of degenerate BICs in triangular resonators is extremely sensitive to switch output flows by small perturbations with $100\%$ efficiency.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::877c73438e671924750a1716944a94dc https://doi.org/10.1103/physrevb.106.085404 Zobrazit plný text záznamu