Cholesteric liquid crystalline polymer networks as optical sensors

M. Moirangthem, A.P.H.J. Schenning

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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Abstract

In the past decade, chiral nematic liquid crystals (LCs) have emerged as an attractive material for the development of stimuli-responsive systems (White et al. 2010; Ge and Yin 2011; Fenzl et al. 2014; Mulder et al. 2014; Stumpel et al. 2014). Due to the periodic alteration of their refractive indices, they act as one-dimensional photonic structures and reect circularly polarized light of same handedness. The reection of light is governed by Bragg’s law: λ θb = nP cos where λb is the wavelength of Bragg reection, n is the average refractive index, and P is the length of the helical pitch. The pitch of a chiral nematic is dened as the length traversed by the molecular director nˆ on 360° rotation (Figure 4.1a). It is inversely proportional to the concentration [C] as well as the helical twisting power β
Original languageEnglish
Title of host publicationLiquid Crystal Sensors
EditorsA.P.H.J. Schenning, G.P. Crawford, D.J. Broer
Place of PublicationBoca Raton
PublisherCRC Press
Chapter4
Pages83-101
Number of pages19
ISBN (Electronic)9781498729741
ISBN (Print)9781498729727
Publication statusPublished - 1 Jan 2017

Publication series

NameThe Liquid Crystals Book Series
PublisherTaylor & Francis

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Cite this

Moirangthem, M., & Schenning, A. P. H. J. (2017). Cholesteric liquid crystalline polymer networks as optical sensors. In A. P. H. J. Schenning, G. P. Crawford, & D. J. Broer (Eds.), Liquid Crystal Sensors (pp. 83-101). (The Liquid Crystals Book Series). Boca Raton: CRC Press.