A design method of long-wave infrared achromatic split-beam focusing type superlens

The long-wave infrared achromatic beam splitting and focusing metalens designed by row staggered arrangement and particle swarm optimization algorithm solves the problems of large size, large mass and focus drift of existing systems under the requirements of miniaturization and high integration. It realizes the integrated integration of multi-polarization state beam splitting and focusing and broadband focusing consistency.

CN122018152BActive Publication Date: 2026-06-19CHANGCHUN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGCHUN UNIV OF SCI & TECH
Filing Date
2026-04-14
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing long-wave infrared polarization imaging systems suffer from problems such as large size, large mass, narrow operating band, and low focusing efficiency in applications requiring miniaturization and high integration. Furthermore, metalenses exhibit severe focus drift under broadband detection conditions.

Method used

A long-wave infrared achromatic beam-splitting metalens was designed by integrating linearly polarized and circularly polarized light nanounits in an alternating row arrangement, using particle swarm optimization (PSO) algorithm for achromatic phase optimization, and verifying the focusing performance of the metalens array through angular spectrum propagation algorithm.

Benefits of technology

It achieves integrated multi-polarization beam splitting and focusing, broadens the working band, improves system integration and broadband focusing consistency, reduces focus drift risk, simplifies system optical structure and reduces computational resource dependence.

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Abstract

This invention relates to the field of optical device design technology, specifically a design method for a long-wavelength infrared achromatic beam-splitting focusing metalens. The method includes: determining the substrate material, nanostructure material, radius R, focal length f, and focal coordinates of four polarization channels; constructing a phase parameter library and a transmittance parameter library for linearly polarized units using FDTD scanning; performing achromatic phase optimization on the four polarization states within the characteristic wavelength set based on the PSO algorithm to generate structural parameter distribution data for the linearly polarized and circularly polarized portions; constructing the metalens using a row-interlaced arrangement; and verifying the focusing performance of the metalens array using an angular spectrum propagation algorithm. This invention integrates nanounits that control linearly and circularly polarized light through row-interlaced arrangement, combined with PSO algorithm-based achromatic phase synergistic optimization, to achieve integrated multi-polarization-state beam splitting and focusing, broadening the working wavelength band and improving broadband focusing consistency, while reducing the computational cost of metalens array design.
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