Switchable high-Q light absorbers based on phase-change resonant metasurfaces
Abstract
In this paper, we propose a switchable high-Q light absorber based on a reconfigurable metasurface enabled by a lowloss phase-change material (PCM). By leveraging the coupling between guided-mode resonance and Fabry-Perot modes, mediated by the phase-transition dynamics of the embedded PCM, the resonance Q factor can be actively tuned. This allows the system to switch from a perfect dark state, governed by the physics of bound states in the continuum, to a critically coupled resonance with a finite Q factor. Consequently, the metasurface exhibits perfect absorption in the amorphous state and a reflection-dominated response in the crystalline state. The proposed metasurface holds significant potential for diverse nanophotonic applications, including photodetection and thermal emission control.
Cite
@article{arxiv.2602.11535,
title = {Switchable high-Q light absorbers based on phase-change resonant metasurfaces},
author = {Kai Qi and Guoxiang Wang and Xiang Shen and Yixiao Gao},
journal= {arXiv preprint arXiv:2602.11535},
year = {2026}
}