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    Area of Science:

    • Optoelectronics
    • Photonics
    • Materials Science

    Background:

    • Active polarization image sensors are crucial for advanced imaging applications.
    • Existing micro-quarter-wave-retarder (MQWR) technologies often lack achromaticity and suffer from optical cross-talk.
    • Accurate measurement of all Stokes vector parameters, including circular polarization, is essential for comprehensive polarization imaging.

    Purpose of the Study:

    • To develop a liquid-crystal-polymer (LCP)-based dual-layer MQWR array for active polarization image sensors.
    • To enable the extraction of circularly polarized light components across the entire visible spectrum.
    • To improve the performance and integration of MQWRs in polarization imaging systems.

    Main Methods:

    • Fabrication of a dual-layer MQWR array using liquid-crystal-polymer (LCP) materials.
    • Optical design and optimization for high achromaticity and minimal transmittance loss.
    • Characterization of optical performance, including extinction ratio and thickness.
    • Demonstration of monolithic integration with commercial solid-state image sensors.

    Main Results:

    • The proposed MQWRs enable extraction of circularly polarized light components across the full visible spectrum.
    • High achromaticity of the MQWRs allows for broadband polarization imaging applications.
    • The thin structure (2.43μm) significantly reduces optical cross-talk between adjacent pixels.
    • Superior optical performance, including high transmittance and extinction ratio, was achieved.
    • A cost-effective fabrication recipe facilitates monolithic integration.

    Conclusions:

    • The developed LCP-based dual-layer MQWR array offers a significant advancement for active polarization image sensors.
    • This technology enables multi-spectral full Stokes polarization imaging on a single chip.
    • The MQWRs provide a cost-effective and high-performance solution for next-generation polarization imaging systems.