Polarization achromatic optical imaging system based on super-structure surface

Abstract

The invention discloses a polarization achromatic optical imaging system based on a super-structure surface, the system is composed of super-structure lenses corresponding to X polarization, Y polarization, 45-degree polarization and circular polarization, and each super-structure lens comprises a substrate and a dielectric nanometer unit super-structure surface layer. According to the invention, numerous anisotropic structures are constructed and comprise a single rectangular coupling structure and a plurality of rectangular coupling structures. According to the method, two variables r0 and C0 are added on the basis of a traditional lens formula, the design freedom degree is high, the ideal super-structure lens can be efficiently and accurately designed after the phase is folded into 2 pi and the algorithm is combined, and a brand-new polarization achromatic design scheme is provided. Different achromatic design schemes are provided for different polarized light, and high efficiency of the polarization imaging system is guaranteed. Various materials can be selected according to different wave bands, and the imaging efficiency can be ensured by selecting materials with excellent optical response.

Description

technical field [0001] The invention relates to a polarization achromatic optical imaging system based on a metasurface, and belongs to the technical field of metasurface applications. Background technique [0002] As one of the important inherent characteristics of electromagnetic waves, the polarization of light is manifested as the asymmetry of the vibration direction relative to the propagation direction. This characteristic leads to different optical responses of light with different polarization states. Therefore, the corresponding polarization is obtained after filtering natural light. Light is conducive to capturing the required information, and then widely used in various research fields such as nature exploration, biological detection, and medical diagnosis. In the case of complex wavelength applications, chromatic aberration is also an important factor to consider. It shows that the refractive index of light of different wavelengths is very different when it passe...

AI Technical Summary

Problems solved by technology

This scheme uses geometric phase as a design method, and there is a problem of conversion efficiency from one circular polarization state to another circular polarization state, resulting in lower imaging efficiency for linearly polarized light, which limits its application range

[0007] The existing solutions use metal materials with large ohmic loss and low lens efficiency; the achromatic design scheme for several discrete wavelengths cannot meet the actual needs; the existing polarization design is limited to single circular polarization, single linear polarization or polarization-independent cases, polarization imaging The degree of freedom is not high

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