High-Q Localized States in Finite Arrays of Subwavelength Resonators

Date

2021

Authors

Kornovan, D.
Savelev, Roman
Kivshar, Yuri
Petrov, Mihail I

Journal Title

Journal ISSN

Volume Title

Publisher

American Chemical Society

Abstract

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 ∝ Nα, 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.

Description

Keywords

subwavelength nanoparticles, Mie resonances, Q-factor, nanoparticle arrays

Citation

Source

ACS Photonics

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1021/acsphotonics.1c01262

Restricted until

2099-12-31