单像素成像与超表面成像(特邀)

Single-pixel imaging and metasurface imaging(Invited)

单像素成像作为一种典型的计算成像方式,利用单像素探测器测量一系列掩模图像照射目标之后的光强值,进而通过不同重构算法恢复目标图像。相较于多像素探测器(CCD或CMOS),单像素成像克服了硬件的限制,在某些特殊波段,探测效率更高,响应更快。超表面是由亚波长的金属或介质单元构成的二维人造结构。在可见光波段,超表面可以调控入射光的多种自由度以实现多通道全息图的显示;在微波波段,超表面可以与导波模式进行耦合辐射出多种模式图案。简单介绍了单像素成像的研究背景、成像原理和重构算法、超表面成像的研究背景,并主要讨论了两种成像方式在可见光波段以及微波波段的结合以及相关研究,最后提出了未来的发展方向。

As a typical computational imaging modality, single-pixel imaging uses a single-pixel detector to measure the light intensities reflected or transmitted from the target after its interaction with a series of patterns.By calculating the correlation of the measured intensities and relevant patterns with different reconstruction algorithms, the target image can be recovered. Compared with multi-pixel detector(i.e. CCD or CMOS), singlepixel imaging overcomes hardware limitations and the detection efficiency is higher, and the response is faster in some special wavebands. Metasurfaces are a kind of artificial two-dimensional materials consisting of an array of subwavelength metallic or dielectric unit cells. In the optical wavelength regime, the metasurface can display various holograms by adjusting different degrees of freedom of incident light. In the microwave regime,the metasurface can couple with the waveguide and emit various radiating modes as patterns. The research background, imaging principle, reconstruction algorithms of single-pixel imaging, and the research background of metasurface imaging were reviewed. The discussion of relevant works was mainly focused on the combination of single-pixel imaging and metasurface imaging in optical and microwave regimes, and finally a perspective on the potential development in future was proposed.