Degenerate bound states in the continuum in square and triangular open acoustic resonators
Mesoscale and Nanoscale Physics
2022-08-17 v1
Abstract
We consider square and equilateral triangular open acoustic resonators with the and 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 -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 efficiency.
Keywords
Cite
@article{arxiv.2207.14162,
title = {Degenerate bound states in the continuum in square and triangular open acoustic resonators},
author = {Almas Sadreev and Evgeny Bulgakov and Artem Pilipchuk and Andrey Miroshnichenko and Lujun Huang},
journal= {arXiv preprint arXiv:2207.14162},
year = {2022}
}