High-Q Localized States in Finite Arrays of Subwavelength Resonators,ACS Photonics

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High-Q Localized States in Finite Arrays of Subwavelength Resonators
ACS Photonics ( IF 6.5 ) Pub Date : 2021-11-22 , DOI: 10.1021/acsphotonics.1c01262
Danil F. Kornovan ₁ , Roman S. Savelev ₁ , Yuri Kivshar ₂ , Mihail I. Petrov ₁

Affiliation

We uncover how to achieve giant Q-factors in finite-length periodic arrays of subwavelength optical resonators. The underlying physics is based on interference between the band-edge mode and a standing mode in the array, and it leads to the formation of spatially localized states with dramatically suppressed radiative losses. We demonstrate this concept for an array of N dipoles with simultaneous cancellation of multipoles up to N-th order and the Q-factor growing as Q ∝ N^α, where α ≳ 6.88. We study a realistic array of nanoparticles (N ≲ 37) supporting the magnetic dipole Mie resonances with the enhanced Purcell factor (∼7600) achieved by tuning the array parameters.

中文翻译：

亚波长谐振器有限阵列中的高 Q 局域态

我们揭示了如何在亚波长光学谐振器的有限长度周期阵列中实现巨大的Q因子。基础物理学基于带边模式和阵列中的常态模式之间的干涉，它导致空间局域态的形成，并显着抑制了辐射损耗。我们针对N 个偶极子阵列演示了这个概念，同时取消了高达N阶的多极子，并且Q因子随着Q ∝ N ^α增长，其中 α ≳ 6.88。我们研究了一系列真实的纳米颗粒（N ≲ 37) 通过调整阵列参数实现增强的珀塞尔因子 (∼7600) 支持磁偶极米氏共振。

更新日期：2021-12-15

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