太赫兹辐射
光学
物理
像素
无损压缩
领域(数学)
电磁场
电场
图像处理
近场和远场
图像(数学)
计算机科学
人工智能
数学
量子力学
纯数学
数据压缩
作者
Haocheng Cai,Jitao Li,Luhong Mao
出处
期刊:Optics Express
[The Optical Society]
日期:2022-12-20
卷期号:31 (2): 2654-2654
被引量:5
摘要
Optical bound states in continuum (BICs) are the special lossless electromagnetic resonance modes found in optical transmission media. Optical BICs supported by metasurfaces can bring a series of image-based applications, which can be classified into far-field image-based applications and near-field image-based applications according to imaging distance. The far field image-based applications of optical BICs supported by metasurfaces have been proved theoretically and experimentally. However, the near-field image-based applications are still in the stage of theoretical demonstration, and its practical feasibility is still questioned. In this letter, we have experimentally demonstrated the feasibility of near-field image-based applications of optical BICs. An all-silicon terahertz metasurface that supports near-field displaying based on quasi-BIC is designed. Its unit cell is based on the classic asymmetric elliptical strip structure, and one unit cell of the metasurface corresponds to one display pixel. By observing the electric field distribution of the metasurface in the near-field region, the display of the given image is successfully constructed. The near-field image-based application of BICs may be beneficial for the information encryption, the hidden item detection, matter analysis, etc.
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