High-Q localized states in finite arrays of subwavelength resonators

• URL: http://arxiv.org/abs/2011.11791v2
• Date: Tue, 1 Dec 2020 11:34:24 GMT
• Title: High-Q localized states in finite arrays of subwavelength resonators
• Authors: Danil F. Kornovan, Roman S. Savelev, Yuri S. Kivshar, and Mihail I. Petrov
• Abstract summary: We introduce a novel physical mechanism for achieving giant quality factors ($Q$-factors) in finite-length periodic arrays of subwavelength optical resonators. We propose a realistic array of Mie-resonant nanoparticles ($N lesssim 29$) with a dramatic enhancement of the Purcell factor (up to $sim $3400) achieved by tuning the array parameters.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce a novel physical mechanism for achieving giant quality factors ($Q$-factors) in finite-length periodic arrays of subwavelength optical resonators. The underlying physics is based on interference between the band-edge mode and another standing mode in the array, and 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 $Q \propto N^{\alpha}$, where $\alpha \gtrsim 6.88$. Based on this finding, we propose a realistic array of Mie-resonant nanoparticles ($N \lesssim 29$) with a dramatic enhancement of the Purcell factor (up to $\sim $3400) achieved by tuning of the array parameters.

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