We have found the solution of the boundary value problem for reflectance and transmittance of normal circularly polarized light impinges on a cholesteric elastomer film with a twist defect. We have found a tunable resonant mode in the reflectance band for right and left circularly polarized light. When the values of chiral twist defect are increased in the cholesteric elastomer film, the resonant modes changes to shorter wavelength until the edge band is reached.
We have found experimentally the transmittance of normal incident circularly polarized light due to new chiral mixture that was distorted by electric field. The chiral mixture was achieved by mixtures of two nematic liquid crystals (5OCB and 5CB) and S-1-bromo-2-methylbutane. We have found a regime of circular Bragg diffraction for certain values of concentrations and thickness. Optical diffraction phenomenon have received particular attention in research for optical and electro-optical applications, such as low –voltage modulators, reflective phase gratings and smart reflectors.
In this work we investigate the existence of an one-dimensional Porous Silicon (PS) based structure possesing simultaneously Photonic and Phononic Band Gaps at the same reduced frequency. We present rigorous electrodynamic and elastodynamics calculations of the eigenvalues of the wave equations for electromagnetic and longitudinal (transverse) mechanical vibrations. The PS structure is identified as a PhoXonic structure exhibiting ranges of forbidden frequencies for visible light and hypersound.
Using the equilibrium configuration of an imprinted cholesteric elastomer film with a twist defect, we have found the
solution of the boundary value problem for the reflection and transmission of normal incident circularly polarized light
for different values of chiral order parameter. We have found resonant modes for both polarizations in smaller values of
chiral order parameter and in parameters related with elastic energy.