Yang Fuming, Liang Zhongzhu, Shi Xiaoyan, Li Jinhuan, Guo Siyu, Wu Zhe, Sun Wenwen, Chen Xiangtao, Wei Xintong, Dai Rui, Liu Junying
Opt Lett. 2025 Mar 15;50(6):2049-2052. doi: 10.1364/OL.554792.
Ultraviolet (UV, 200-400 nm) detection with high efficiency and excellent spectral resolution is essential in spectral analysis. This Letter proposes a UV narrowband all-dielectric metasurface absorber with an ultra-thin absorption layer. The design incorporates lossless AlO resonators placed on a thin (20 nm) lossy GaO film, which enhances the absorption intensity at a specific wavelength. The near-perfect narrowband absorption enhancement results from the spectral overlap of the magnetic dipole (MD) and the electric dipole (ED) absorption modes by surface lattice resonance (SLR). The proposed absorber exhibits high-efficiency and high-quality (Q) absorption performance (A > 95%, Q ∼ 231) and allows for flexible control over the absorption wavelength through simple parameter adjustments. These features make it ideal for narrowband emission, spectrum detection, and multispectral sensing.
在光谱分析中，高效且具有出色光谱分辨率的紫外线（UV，200 - 400 nm）检测至关重要。本文提出了一种具有超薄吸收层的紫外线窄带全介质超表面吸收器。该设计将无损AlO谐振器置于薄（20 nm）的有损GaO薄膜上，这增强了特定波长处的吸收强度。近乎完美的窄带吸收增强源于表面晶格共振（SLR）使磁偶极子（MD）和电偶极子（ED）吸收模式的光谱重叠。所提出的吸收器展现出高效和高品质（Q）的吸收性能（A > 95%，Q ∼ 231），并且通过简单的参数调整就能灵活控制吸收波长。这些特性使其成为窄带发射、光谱检测和多光谱传感的理想选择。
