Significant anisotropic deformation and optical shifts in stretched cholesteric liquid crystal elastomers

Mori, Saki; Takagi, Hideaki; Shimizu, Nobutaka; Igarashi, Noriyuki; Sakurai, Shinichi; Urayama, Kenji

doi:10.1039/d4sm00325j

Soft Matter

2024

DOI: 10.1039/d4sm00325j

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Significant anisotropic deformation and optical shifts in stretched cholesteric liquid crystal elastomers

Saki Mori,

Hideaki Takagi,

Nobutaka Shimizu

et al.

Abstract: Stretching cholesteric elastomer films perpendicular to the helical axis yields a blue shift in the reflection band and significant anisotropic contractions, leading to a reduction in reflection selectivity.

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Dynamic Infrared Reflective Filters Prepared from Cholesteric Liquid Crystalline Elastomers

Phillips,

Chen,

McCracken

et al. 2024

ACS Appl. Opt. Mater.

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Cholesteric liquid crystalline elastomers (CLCEs) exhibit selective reflection due to a periodic variation of the refractive index throughout the thickness of the material. CLCEs can be formulated and prepared to reflect light in the UV, visible, and infrared regions of the electromagnetic spectrum by simply adjusting the concentration of the chiral species. This report details the synthesis and preparation of appropriately thick CLCEs that maximize reflection in both the short-wave and mid-wave infrared (SWIR, MWIR) regions of the electromagnetic spectrum. As elastomers, fully solid CLCEs can be mechanically deformed to tune the selective reflection. This report details approaches to tune selective reflection, including mechanical deformation, incidence angle, thermochromism, and dielectric actuation. Generally, the optomechanical response of the CLCE at longer pitch lengths (e.g., infrared reflecting) is comparatively less than that of prior examinations of analogous compositions with a shorter pitch. Furthermore, the contribution of modulus and dielectric breakdown to electromechanical response is examined.

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Dynamic Infrared Reflective Filters Prepared from Cholesteric Liquid Crystalline Elastomers

Phillips,

Chen,

McCracken

et al. 2024

ACS Appl. Opt. Mater.

View full text Add to dashboard Cite

show abstract

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Significant anisotropic deformation and optical shifts in stretched cholesteric liquid crystal elastomers

Abstract: Stretching cholesteric elastomer films perpendicular to the helical axis yields a blue shift in the reflection band and significant anisotropic contractions, leading to a reduction in reflection selectivity.

Cited by 1 publication

References 39 publications

Dynamic Infrared Reflective Filters Prepared from Cholesteric Liquid Crystalline Elastomers

Dynamic Infrared Reflective Filters Prepared from Cholesteric Liquid Crystalline Elastomers

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