Elongated films of polymer-dispersed liquid crystals as scattering polarizers

Abstract

Elongated films of polymer dispersed liquid crystals have been experimentally investigated. The dependence of transmittance light polarization on elongation coefficient and temperature has been studied. The possibilities of practical applications of elongated films of polymer dispersed liquid crystals are discussed.

Experimental results and theoretical model to describe angular dependence of light scattering by monolayer of nematic droplets

“…Refractive index of pure PVB is n p = 1.490 at λ = 0.633 μm. However, during the phase separation the part of LC remains dissolved in matrix [9] matching the refractive indices n ⊥ 5CB and n p . To estimate the refractive index of polymer matrix we used the composite with the maximal LC content at which the phase separation has not occurred yet.…”

Light Polarizer Based on Anisotropic Nematic Gel With Electrically Controlled Anisotropy of Scattering

“…PDLC films with ensemble of uniaxially oriented nematic liquid crystal (NLC) droplets were investigated in Ref. [2][3][4][5][6][7][8][9]. Strong anisotropy of scattering is the characteristic of such films [2,4,[6][7][8], allowing their use as light polarizers [2,4] and as optoelectronic elements with electrically controlled polarization characteristics [7,8].…”

“…Strong anisotropy of scattering is the characteristic of such films [2,4,[6][7][8], allowing their use as light polarizers [2,4] and as optoelectronic elements with electrically controlled polarization characteristics [7,8]. The uniform orientation of ellipsoidal nematic droplets is usually achieved by uniaxial stretching [2,4,7,9] or shearing [3,5,8] The light scattering from anisotropic nematic gels was investigated also [1,10]. In such gels a cross-linked anisotropic polymer network is formed in the homogeneous oriented NLC layer.…”

Light modulation characteristics of a single-polarizer electro-optical cell based on polymer dispersed ferroelectric liquid crystals

“…The only diOE erence is that in our case the second polarizer (the PDFLC lm) is not ideal though the diOE erence between the polarized transmission components of the uniaxially oriented PDLC lms may be quite signi cant [3]. By virtue of the symmetry of the problem, we can limit consideration of the angle a to the range 0-90ß ( gures 2, 3 and 4).…”

“…Devices of this type can have either just one polarizer [5,6,11] or no polarizer at all [12]. Figure 1 liquid crystals (PDLCs) [1][2][3][4] has made it possible to introduce a new electro-optical material based on illustrates schematically a single-polarizer PDFLC cell. ferroelectric liquid crystals (FLCs) [5][6][7] and oOE ering a combination of the known advantage s of composite lms [8,9] with the rapid response inherent in chiral smectics.…”