1995
DOI: 10.1103/physreve.51.1191
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Bragg reflection from cholesteric liquid crystals

Abstract: In this paper we discuss the optical reflective properties of single and multidomain cholesteric liquid crystals both experimentally and theoretically. The multidomain system has been prepared by dispersing a low concentration of polymer in a cholesteric liquid crystal. This results in a (passive) bistable colorful reflective display. Here we discuss the role of the polymer in altering the reflective properties in regard to their spectra and viewing characteristics. Theoretically we o6'er an application of the… Show more

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Cited by 185 publications
(74 citation statements)
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“…In addition the green reflectance band has a full width at half maximum (FWHM) of almost double that of the red band. Since the spectral width of a cholesteric material is given by δλ = P o δn [9], with δn the birefringence, this is rather strange as it indicates that the two colour variations are based on materials with a large difference in birefringence. One would expect beetles of the same species to be constructed from identical materials with at best a small difference in the layer thickness.…”
Section: Model Calculationsmentioning
confidence: 99%
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“…In addition the green reflectance band has a full width at half maximum (FWHM) of almost double that of the red band. Since the spectral width of a cholesteric material is given by δλ = P o δn [9], with δn the birefringence, this is rather strange as it indicates that the two colour variations are based on materials with a large difference in birefringence. One would expect beetles of the same species to be constructed from identical materials with at best a small difference in the layer thickness.…”
Section: Model Calculationsmentioning
confidence: 99%
“…Different expressions for other formulations of the same problem can be found in the literature [10,11]. Optimal reflection is obtained when the Bragg condition [2,9] is met:…”
Section: Theoretical Backgroundmentioning
confidence: 99%
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“…The stopband is best seen when the thickness of the SCM exceeds a certain number of helical pitches. 6,[9][10][11] When dissipation is small enough to be ignored, ̳ ε r ðzÞ is positive definite, and the variations of ε a;b;c with respect to the free-space wavelength λ 0 are also small enough to be ignored, the circular-polarization-sensitive stopband can be delineated as 4…”
Section: Introductionmentioning
confidence: 99%
“…In this problem, the half space z < 0 is vacuous while the half space z > 0 is occupied by the hyperbolic SCM, and a circularly polarized plane wave is obliquely incident on the interface z ¼ 0 from its vacuous side. As it is known that the circular Bragg phenomenon develops as the thickness of an SCM increases, 4,10 an SCM half space should conceptually deliver the best developed circular Bragg phenomenon. The underlying boundary-value problem is introduced briefly in Sec.…”
Section: Introductionmentioning
confidence: 99%