1. Key Laboratory of Computational Optical Imaging Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2. University of Chinese Academy of Sciences，Beijing 100049, China
Abstract：As an artificially manufactured sub-wavelength structure array plane, metasurface is widely used in many fields because of its light-weight, easy integration, and realization of multiple functions. Traditional spectral imaging systems rely on dispersive components and cumulative phase differences in the optical path to achieve dispersion and focusing of different wavelengths, which cannot meet system integration needs. Unlike traditional optical components relying on the transmission phase accumulated by electromagnetic waves propagating in the medium, the metasurfacerelies on the interface phase mutation for phase control, so a very thin and light optical system can be realized. In this paper, the transmission phase metasurface is studied. The finite difference time domain algorithm (FDTD algorithm) is used to optimize the cell structure. Introducing the metasurface into the spectral imaging systems, and the research on the metasurface spectral imaging system is carried out by optimizing the size, and structure arrangement of the sub-wavelength structure to realize the independent regulation of multi-wavelength dispersion and to focus. Using this method, scanning the influence of different structure on the phase,according to the phase distribution of the hyperbolic plane lens, several different focusing hyperlenses are designed for different wavelengths, achieving ametasurface multispectral imaging system with eight spectral segments in the visible band 510~710 nm. Electromagnetic and optical simulation software(FDTD solutions), the data processing software is used to analyze the far-field electric field intensity data to obtain spectral data of different wavelengths. Metasurfaces provide a new way for spectral imaging technology and have great application potential in miniaturized spectral remote sensing fields such as aerospace. Compared with traditional grating or prism spectroscopy structures, metasurface spectacle imaging systems can effectively reduce the system’s volume. Their ultra-light, ultra-thin, and portable characteristics solve the limitations of existing spectroscopy imaging systems and provide a theoretical basis for developing miniaturized and lightweight spectroscopy systems.
Key words：Imaging spectrometer; Metasurface; Optical device; Phase control
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