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

Lujun Huang (), Rong Jin, Chaobiao Zhou, Guanhai Li (), Lei Xu, Adam Overvig, Fu Deng, Xiaoshuang Chen, Wei Lu, Andrea Alù () and Andrey E. Miroshnichenko ()
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Lujun Huang: University of New South Wales
Rong Jin: Chinese Academy of Sciences
Chaobiao Zhou: Guizhou Minzu University
Guanhai Li: Chinese Academy of Sciences
Lei Xu: Nottingham Trent University
Adam Overvig: City University of New York
Fu Deng: University of New South Wales
Xiaoshuang Chen: Chinese Academy of Sciences
Wei Lu: Chinese Academy of Sciences
Andrea Alù: City University of New York
Andrey E. Miroshnichenko: University of New South Wales

Nature Communications, 2023, vol. 14, issue 1, 1-9

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 patterning a low-index layer on top of a 220 nm silicon on insulator substrate. The measurements show Q-factors up to 2.39 × 105, comparable to the largest Q-factor obtained by topological engineering, while the resonant wavelength is tuned by varying the lattice constant of the top perturbation layer. Our results hold great promise for exciting applications like sensors and filters.

Date: 2023
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DOI: 10.1038/s41467-023-39227-5

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