光学
布里渊区
布里渊散射
吸收(声学)
折叠(DSP实现)
物理
材料科学
光纤
电气工程
工程类
作者
Rong Jin,Lujun Huang,Jiaoyang Guo,Zhenchu Fu,Yukang Zhang,Feilong Yu,Jin Chen,Guanhai Li,Xiaoshuang Chen,Jane W. Z. Lu
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2025-03-28
卷期号:33 (8): 17334-17334
被引量:5
摘要
Monolayer graphene-based perfect absorber plays a critical role in advanced sensing, photodetection, and optical communications. Significant effort has been devoted to realizing an ideal absorber at a single wavelength by integrating graphene onto a high-quality resonant metasurface. Here, we present what we believe to be a novel strategy for achieving independent, multi-band perfect absorption in graphene by harnessing Brillouin zone-folding induced quasi-bound states in the continuum (quasi-BICs). Our dual-grating design allows for folding two distinct guided modes to the Γ point, where controlled structural perturbations transform them into quasi-BICs with unique symmetry properties. We show that resonance wavelengths and quality factors of quasi-BICs can be independently tuned so that the critical coupling condition can be simultaneously satisfied, giving rise to perfect absorption at two distinct wavelengths. Moreover, such a strategy can be readily extended to a four-band configuration by incorporating a partially etched silicon layer with monolayer graphene. This versatile platform not only achieves perfect absorption at multiple wavelengths but also offers arbitrary spectral control, paving the way for next-generation multi-channel photonic devices with enhanced performance.
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