Coded cholesteric LC metalens for broadband achromatic imaging

Zhenger Yang; Chinhua Wang

doi:10.1117/12.3040590

13 September 2024 Coded cholesteric LC metalens for broadband achromatic imaging

Zhenger Yang, Chinhua Wang

Author Affiliations +

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 132541E (2024) https://doi.org/10.1117/12.3040590
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

Liquid crystals (LC) planar optical elements have attracted much interests owning to its simple fabrication and powerful beam shaping capability. Among them, cholesteric liquid crystals (CLC) have received widespread attention due to their self-assembly behavior, natural chiral structure, circular polarization selectivity, and Pancharatnam–Berry (PB) phase modulation capability. However, traditional CLC lenses suffer from significant chromatic aberration which results in single wavelength or narrow bandwidth imaging only. Conventional way to solve the chromatic aberration is either combining LC lens with a refractive lens with opposite dispersion or designing multiple layers for a few discrete wavelengths, resulting in the optical system bulky and complicated. Here, we propose and demonstrate a single-chip achromatic CLC lens for broad and continuous wavelength band imaging. The proposed CLC lens utilizes cubic wavefront encoding technology and is prepared using optical orientation technology, avoiding the complex manufacturing process of conventional metalenses. Experimental results demonstrate that an F/#30 lens with a coding parameter of 20 can achieve achromatic imaging with a total bandwidth of 80 nm across the entire Bragg reflection band. This study opens an avenue for the achromatic manipulation of CLC lenses and has great potential in the field of imaging, display and dispersion management.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Zhenger Yang and Chinhua Wang "Coded cholesteric LC metalens for broadband achromatic imaging", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 132541E (13 September 2024); https://doi.org/10.1117/12.3040590

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KEYWORDS

Reflection

Liquid crystals

Polarized light

Point spread functions

Image restoration

Bragg wavelengths

Modulation transfer functions

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