articleNature CommunicationsJun 10, 2023GOLD OA

Ultrahigh-Q guided mode resonances in an All-dielectric metasurface

LHLujun HuangRJRong JinCZChaobiao ZhouGLGuanhai LiLXLei Xu

University of Canberra · UNSW Sydney · +9 more institutions

PubMed
Indexed incrossrefdoajpubmed

Abstract

Abstract High quality(Q) factor optical resonators are indispensable for many photonic devices. While very large Q-factors can be obtained theoretically in guided-mode settings, free-space implementations suffer from various limitations on the narrowest linewidth in real experiments. Here, we propose a simple strategy to enable ultrahigh-Q guided-mode resonances by introducing a patterned perturbation layer on top of a multilayer-waveguide system. We demonstrate that the associated Q-factors are inversely proportional to the perturbation squared while the resonant wavelength can be tuned through material or structural parameters. We experimentally demonstrate such high-Q resonances at telecom wavelengths by…

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Topics & keywords

Topics
Keywords
  • Resonator
  • Wavelength
  • Q factor
  • Laser linewidth
  • Dielectric
  • Silicon on insulator
  • Optoelectronics
  • Perturbation (astronomy)
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