Dual-frequency field assembly of over mm-thick nonlinear chiral photonic crystals for advanced photonic applications

I. C. Khoo; J.-W. Chen; Tsung-Hsien Lin; Ting-Mao Feng

doi:10.1117/12.2678029

29 September 2023 Dual-frequency field assembly of over mm-thick nonlinear chiral photonic crystals for advanced photonic applications

I. C. Khoo, J.-W. Chen, Tsung-Hsien Lin, Ting-Mao Feng

Author Affiliations +

Proceedings Volume 12658, Liquid Crystals XXVII; 1265809 (2023) https://doi.org/10.1117/12.2678029
Event: SPIE Organic Photonics + Electronics, 2023, San Diego, California, United States

Abstract

We report a room-temperature dual-frequency field assembly technique that is capable of fabricating large-areal size (~cm2 or larger), well-aligned cholesteric liquid crystals to thicknesses up to 2.2 mm, corresponding to period number N (thickness/index grating period) of nearly10,000 in the visible spectral regime. The method employs successive application of low- and high- frequency electric field on a thick cell of CLC starting mixture containing a nematic constituent of negative anisotropy. The low-frequency field creates conductive hydrodynamical instabilities that mash the mixture to a state with completely randomized orientation of the cholesteric helices; the next application of a high-frequency field at a field strength below the dielectric hydrodynamic instability reorient all the helices into uniform standing helices. Such extraordinarily thick chiral photonic crystals exhibit many never-before-realized chiral photonic properties such as giant rotation of optical polarization with high transmission (low scattering loss), polarization switching and ultrafast pulse modulation capabilities for visible to mid-infrared lasers, in addition to dynamic tunability by electrical, thermal, or optical means.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

I. C. Khoo, J.-W. Chen, Tsung-Hsien Lin, and Ting-Mao Feng "Dual-frequency field assembly of over mm-thick nonlinear chiral photonic crystals for advanced photonic applications", Proc. SPIE 12658, Liquid Crystals XXVII, 1265809 (29 September 2023); https://doi.org/10.1117/12.2678029

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