论文标题
正方形和三角形开放声音谐振器中的连续体中的归化状态
Degenerate bound states in the continuum in square and triangular open acoustic resonators
论文作者
论文摘要
我们将$ c_ {4v} $和$ c_ {3v} $ symmetries分别考虑正方形和等边三角开放的声音谐振器。特征态意外数字四重变性的方形和三角谐振器具有独特的特性，这些元素产生了两倍的脱位弗里德里希·韦特根（FW）BICS。与平时的FW BIC相比，退化的FW BICS在谐振器大小的范围内保持了高$ Q $因素。这消除了正确选择谐振器的制造困难。三角谐振器中退化BIC的存在对通过$ 100 \％$效率的小扰动切换输出流非常敏感。
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.
