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The exceptional resonance was excited by symmetry-protected quasi-bound states in continuum (Q-BICs). Q-BIC absorption ~ 90% at the communication wavelength was demonstrated by a germanium nanohole metasurface without a back reflector involved.
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Ming-Jyun Ye, Dmitrii N. Maksimov, Kuo-Ping Chen, "All-dielectric metasurface infrared absorber with symmetry-protected bound stated in continuum," Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC126460P (4 October 2023); https://doi.org/10.1117/12.2678018