Journal ArticleDOI
Experimental Study on Higher Order Reflection by Monodomain Cholesteric Liquid Crystals
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In this paper, the second and the third order selective reflections for monodomain cholesterics of various cell thicknesses at various angles of incidence were measured in the spectral region.Abstract:
Reflection spectra have been measured in the spectral region of the second and the third order selective reflections for monodomain cholesterics of various cell thicknesses at various angles of incidence. Thicker cells give rise to higher reflectance at larger angles of incidence. The second order reflection region consists of three bands which show characteristic polarization correlation: The central band is a total reflection band, where incident light of any polarization is reflected. The reflected light is a polarized when it polarized light is incident and vice versa. Contrary to the central band, two side bands are selectively reflected; σ(π) polarized light is reflected in the longer (shorter) wavelength band retaining its polarization. The third order reflection bands observed for the first time have been found to give the same polarization characteristics as that of the second order reflection bands.read more
Citations
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Journal ArticleDOI
Cholesteric Liquid Crystals with a Broad Light Reflection Band
TL;DR: Novel cholesteric-liquid-crystalline architectures with the related fabrication procedures must be developed to broaden the bandwidth around a central reflection wavelength, do without the polarization-selectivity rule and go beyond the reflectance limit.
Journal ArticleDOI
The circular Bragg phenomenon
TL;DR: The circular Bragg phenomenon is the almost total reflection of the incident light of the co-handed circular-polarization state but very little reflection of a cross-handed LPA.
Journal ArticleDOI
Electromagnetic plane–wave response characteristics of non–axially excited slabs of dielectric thin–film helicoidal bianisotropic mediums
TL;DR: In this article, the constitutive relations for the dielectric TFHBMs are substituted into the time-harmonic Maxwell curl equations, and a 4 × 4 matrix ordinary differential equation is obtained.
Book
Optics of Chiral Liquid Crystals
TL;DR: In this article, the same approach was used to describe the interaction between optical (long wave) radiation and periodic media of complex structure, specifically, chiral liquid crystals, in the context of diffraction theory.
Journal ArticleDOI
Handedness reversal of circular Bragg phenomenon due to negative real permittivity and permeability.
TL;DR: The circular Bragg phenomenon displayed by the material is proved here to suffer a change which indicates that the structural handedness has been, in effect, reversed.
References
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Journal ArticleDOI
Optics in Stratified and Anisotropic Media: 4×4-Matrix Formulation
TL;DR: A 4×4-matrix technique was introduced by Teitler and Henvis as discussed by the authors to solve the problem of reflection and transmission by cholesteric liquid crystals and other liquid crystals with continuously varying but planar ordering.
Journal ArticleDOI
Selective Reflection by Cholesteric Liquid Crystals
R. Dreher,G. Meier,Alfred Saupe +2 more
TL;DR: In this paper, a more general approach is outlined for arbitrary angles of incidence, and the two principal dielectric constants are determined from the angles of total reflection measured with a refrectometer.
Journal ArticleDOI
Twisted Smectic C Phase: Unique Optical Properties
TL;DR: In this article, a single-domain sample of cholesteric liquid crystals and of the recently reported twisted smectic C phase may have identical optical properties for light incident in the direction of the axis of twist.
Journal ArticleDOI
Experimental Studies on Reflection Spectra in Monodomain Cholesteric Liquid Crystal Cells: Total Reflection, Subsidiary Oscillation and Its Beat or Swell Structure
TL;DR: In this paper, it was shown that left-circularly polarized light incident on a left-handed helix gives rise to a beat structure in the subsidiary oscillation, while right-Circularly polarised light causes a swell to be superimposed on the subsidiary waveform.