Super-bound states in the continuum through merging in grating

被引：10

作者：

Bulgakov E. ^{[1
]}

Shadrina G. ^{[2
]}

Sadreev A. ^{[1
]}

Pichugin K. ^{[1
]}

机构：

[1] Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk

[2] Russia Institute of Computational Modelling SB RAS, Krasnoyarsk

来源：

Physical Review B | 2023年 / 108卷 / 12期

基金：

俄罗斯科学基金会;

关键词：

Q factor measurement;

D O I：

10.1103/PhysRevB.108.125303

中图分类号：

TM93 [电气测量技术及仪器];

学科分类号：

080802 ;

摘要：

We consider bound states in the continuum (BICs) in grating composed of infinitely long silicon rods of rectangular cross-section. We reveal merging off-Γ Friedrich-Wintgen BIC with symmetry protected BIC. We present CMT and multipole decomposition theory, complementing each other, to analyze the merging phenomenon. The theories show a crossover of the behavior of Q factor from standard inverse square law kx,z-2 towards extremely fast boosting law kx,z-6 in momentum space. In turn that crossover gives rise to another crossover from Q∼N2 to Q∼N3 for symmetry protected quasi-BIC in finite grating of N rods owing to suppression of radiation leakage of quasi-BIC mode from surface of grating. As a result, the Q factor of quasi-BIC is determined by residual leakage from ends of grating. We show numerically that this leakage can also be suppressed considerably if grating is stretched from the ends. © 2023 American Physical Society.

引用

共 70 条

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