双功能超表面成像处理器
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摘要:
光学图像处理具有运算速度快、可并行操作等优势。本研究设计了一种单层超表面结构，用于实现图像光学成像与边缘检测功能。该双功能图像处理无需借助4F系统，仅通过改变入射圆偏振光的手性即可实现切换。所设计的超表面由硅纳米柱构成，优化后的硅纳米柱可等效为透过率达87%的半波片。仿真与实验结果验证了超表面的性能表现。这种集成式光学超表面不仅简化了图像处理系统，更为超表面在并行图像处理与光学集成领域的应用开辟了新路径。
Abstract:Optical image processing has the advantages of fast and parallel operation. One single-layered metasurface is designed to implement the optical imaging and edge detection of image. The dual-functional image processing is conducted without the aid of 4f system and it is switched only by the handedness of incident circularly polarized light. The designed metasurface consists of silicon nanopillars and the optimized nanopillars are equivalent to half-wave plates with the transmittance of 87%. The simulation and experimental results verify the performance of metasurface. The integrated optical metasurface enables the extremely simple image processing system and it paves the way for the applications of metasurfaces in parallel image processing and optical integrating.
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Key words:
- Metasurface /
- Optical imaging /
- Edge detection of image /
- Optical image processing
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Figure 1. Schematic diagram of metasurface image processing (a), structure parameters of diatoms (b), and metasurface consisting of two interlaced nanostructures (c)
Figure 2. Amplitude and phase distributions of metasurface for optical imaging (a) and edge detecting (d), theoretical (b, e) and simulated (c, f) imaging (b, c) and edge detection (e, f) of two objects, where the inserted scale bars denote 1μm.
Figure 3. Schematic diagram for the experiment setup and SEM image of sample (a), the measured one- and two-dimensional diffraction intensity distributions with objects illuminated by LCP and RCP light illumination (b)
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