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A thiol-ene-based HPDLC grating with s-polarizationdominated diffraction.
Optics Letters
|October 1, 2025
Summary
This study introduces a novel thiol-ene monomer-based Holographic Polymer-Dispersed Liquid Crystal (HPDLC) grating that prioritizes s-polarization diffraction. This breakthrough offers a new design avenue for HPDLC gratings with tunable optical properties.
Area of Science:
- Materials Science
- Optics
- Polymer Chemistry
Background:
- Holographic Polymer-Dispersed Liquid Crystal (HPDLC) gratings are known for their electro-optical properties and tunability.
- Traditional HPDLC gratings predominantly show p-polarization diffraction, limiting their application scope.
- There is a need for HPDLC gratings with controllable polarization responses.
Purpose of the Study:
- To develop and characterize a novel HPDLC grating exhibiting dominant s-polarization diffraction.
- To investigate the influence of recording intensity and liquid crystal (LC) doping concentration on refractive index modulation (Δn).
- To explore the relationship between grating morphology, LC droplet size, and threshold driving voltage.
Main Methods:
- Fabrication of HPDLC gratings using a thiol-ene monomer system.
- Experimental investigation of refractive index modulation (Δn) under varying recording intensities and LC concentrations.
- Morphological examinations and analysis of LC droplet size and distribution.
- Measurement of diffraction efficiency for both s- and p-polarized light.
- Determination of threshold driving voltage.
Main Results:
- The developed thiol-ene based HPDLC grating demonstrates significantly higher s-polarization diffraction efficiency compared to p-polarization.
- A maximum Δn of 1.93 × 10⁻² (s-polarization) and 1.21 × 10⁻² (p-polarization) was achieved under optimal recording conditions.
- Refractive index modulation is strongly dependent on the ratio of LC-rich and polymer-rich phases.
- Lower recording intensity results in larger LC droplet sizes, leading to a decreased threshold driving voltage.
Conclusions:
- The novel thiol-ene photopolymer system enables the design of HPDLC gratings with dominant s-polarization diffraction.
- The findings provide a new direction for tailoring HPDLC grating characteristics by controlling morphology and phase separation.
- This work opens possibilities for advanced optical devices utilizing polarization-selective diffraction.
