Optical films of glassy cholesteric liquid crystal for simultaneous selective wavelength reflection and circular dichroism (Conference Presentation)

Mitchell Anthamatten; Shaw H. Chen

doi:10.1117/12.2536979

18 November 2019 Optical films of glassy cholesteric liquid crystal for simultaneous selective wavelength reflection and circular dichroism (Conference Presentation)

Mitchell Anthamatten, Shaw H. Chen

Author Affiliations +

Proceedings Volume 11175, Optifab 2019; 111751K (2019) https://doi.org/10.1117/12.2536979
Event: SPIE Optifab, 2019, Rochester, New York, United States

Abstract

Cholesteric glassy liquid crystal films (Ch-GLCs) are solid-state materials with unique optical properties derived from embedded supramolecular structure. Owing to their ability to be processed into thin films combined with their remarkable durability, Ch-GLCs are increasingly attractive for variety of optical operations including single element circular polarization, notch filtering, and polarized luminescence. Ch-GLCs are most frequently processed into monodomain thin films to exhibit a helical stack of in-plane chiral mesogens with orientation that varies periodically through the thickness of the film. Two distinct optical phenomena emerge from this kinetically frozen supramolecular order: (i) selective reflection and transmission of right and left handed circular polarized light owing to the periodic structure defined by the optical pitch-length and (ii) circular dichroism arising from light-absorbing chiral constituents. In our current experiments, we are modulating the spectral range of the stopband through thin film processing, and we are doping GLC films with absorbing dyes to achieve circular dichroism over different spectral ranges. Our objective is to understand the overlap between stop-band behavior and circular dichoism to enable polarization into the SWIR range as well as optical isolation of incident light. The effort is part of a new center, Advanced Materials for Powerful Lasers (AMPL), based at the University of Rochester.

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Mitchell Anthamatten and Shaw H. Chen "Optical films of glassy cholesteric liquid crystal for simultaneous selective wavelength reflection and circular dichroism (Conference Presentation)", Proc. SPIE 11175, Optifab 2019, 111751K (18 November 2019); https://doi.org/10.1117/12.2536979

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KEYWORDS

Dichroic materials

Liquid crystals

Reflection

Thin films

Optical properties

Polarization

Optical components

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