Research on the Characteristics of Reflective Liquid Crystal Polarization Holographic Cylindrical Lenses

Acta Physica Sinica, Journal Year: 2025, Volume and Issue: 74(7), P. 0 - 0

Published: Jan. 1, 2025

Photo-oriented liquid crystal technology utilizes polarized light illumination to achieve the directional alignment of molecules. This can be developed into polarization volume gratings (PVG), which possess and holographic selectivity characteristics. It also has a broad application prospect as an optical coupling element in waveguides for pupil expansion output. paper reports on fabrication cylindrical lens (PVLS) with beam diameter 2cm using photo-oriented combined off-axis path. During experiment, exposure angle controlled desired grating period variation range, enabling diffraction angles red, green, blue (RGB) incident different periods same. The experimental results show that within range 1721.2 nm 5346.5 nm, when RGB is 3147 2649.1 2275.6 respectively, measured are all 11.59°, error between actual theoretical ±0.5°; under 532nm right-handed circularly light, efficiency 18 normal incidence reaches 90.6%, oblique satisfying Bragg condition 84.4%; simultaneously, one-dimensional direction achieved, preliminarily verifying feasibility PVLS field color waveguides.

Language: Английский

Photoaligned Twisted Nematic Liquid Crystal Elements for Multi-channel Polarization and Electro-Optical Encryption

Journal of Molecular Liquids, Journal Year: 2025, Volume and Issue: unknown, P. 127752 - 127752

Published: May 1, 2025

Language: Английский

The influence of thermally induced cholesteric liquid crystal structural colour for information encryption

Liquid Crystals, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 10

Published: Nov. 11, 2024

Cholesteric liquid crystal (CLC) is particularly remarkable due to its ability exhibit structural colour. Structural colour materials offer solutions for information encryption that feature good stability, ease of perceivability, and arbitrary patterns. This work investigates the temperature-dependent variation CLC provides a quantitative analysis pitch helix twist power (HTP) at different temperatures, further exploring potential applications in encryption. By recording quick response (QR) code patterns LC Polymer cell, single-pattern dual-pattern cells are prepared, their demonstrated. The QR pattern will be hidden or revealed as temperature changes by cell. Additionally, requires polarisers address crosstalk issue under white light, making cell safer solution access control systems. These results lay theoretical foundation stimulus-responsive colours valuable insights security anti-counterfeiting applications.

Language: Английский