Twist defect in an imprinted cholesteric elastomer

Castro-Garay, P.; Reyes, J. A.; Corella-Madueño, A.

doi:10.1063/1.3120549

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…The simplest way of obtaining the proposed structure to use polymer cholesteric elastomers [41] instead of conventional CLCs. Schmidtke et al [27] and Castro-Garay et al [42] experimentally observed the photonic defect modes induced by the twist structural defect in such cholesteric materials. The twist defect can be formed by rotation of one part of the elastomer relative to the other part around the helix axis so that the director variation continuity is broken.…”

Section: Description Of the Modelmentioning

confidence: 99%

Tunable hybrid optical modes in a bounded cholesteric liquid crystal with a twist defect

2018

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Coupling between the defect mode of a cholesteric liquid crystal and the localized mode of a cholesteric liquid crystal-phase plate-metal structure is theoretically demonstrated. It is shown that the transmittance spectrum can be tuned by changing the twist-defect angle and helix pitch, which are governed by external factors. The spectra for different circular polarizations of the incident light are different; specifically, at the nondiffracting polarization, there is no defect-mode transmittance peak.

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Section: Description Of the Modelmentioning

confidence: 99%

Tunable hybrid optical modes in a bounded cholesteric liquid crystal with a twist defect

2018

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“…The system might function as a filter with chemically controlled bandwidth and reflectance. Still on the subject of distorted elastomers, it has been suggested that a chiral twist defect inserted in a cholesteric elastomer gives rise to CP localized modes of both handedness 223. This defect enhances the resonant mode amplitude whose the handedness is opposite that of the helix for high crosslinking density (this parameter is related to the chiral parameter order), whereas the same mode is decoupled with the defect and the resonant mode disappears for low density.…”

Section: Going Beyond the Reflectance Limitmentioning

confidence: 99%

Cholesteric Liquid Crystals with a Broad Light Reflection Band

2012

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The cholesteric-liquid-crystalline structure, which concerns the organization of chromatin, collagen, chitin, or cellulose, is omnipresent in living matter. In technology, it is found in temperature and pressure sensors, supertwisted nematic liquid crystal displays, optical filters, reflective devices, or cosmetics. A cholesteric liquid crystal reflects light because of its helical structure. The reflection is selective - the bandwidth is limited to a few tens of nanometers and the reflectance is equal to at most 50% for unpolarized incident light, which is a consequence of the polarization-selectivity rule. These limits must be exceeded for innovative applications like polarizer-free reflective displays, broadband polarizers, optical data storage media, polarization-independent devices, stealth technologies, or smart switchable reflective windows to control solar light and heat. Novel cholesteric-liquid-crystalline architectures with the related fabrication procedures must therefore be developed. This article reviews solutions found in living matter and laboratories to broaden the bandwidth around a central reflection wavelength, do without the polarization-selectivity rule and go beyond the reflectance limit.

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“…To broaden the bandwidth, different methods have been employed such as forming a pitch gradient 9,10 or creating a non-uniform pitch distribution. 11,12 In recent years, many theoretical studies [13][14][15] and experimental methods [16][17][18] have been developed to achieve a broadband reection. The rst example was introduced by D. J. Broer in 1995, and he obtained a broadband reection of the entire visible spectrum by introducing a pitch gradient in the cholesteric polymer network via UV-induced polymerization of chiral LC diacrylate/nematic monoacrylate/photoinitiator blends.…”

Section: Introductionmentioning

confidence: 99%