Alignment of guest–host liquid crystals with polarized laser light

Effect of surface condition on liquid crystal photoalignment by light-induced azo dye adsorption phenomena

“…The photoalignment technique ensures that LCs are typically aligned on a substrate by irradiating the surface that contains photoreactive molecules with a linearly polarised light (visible or ultraviolet light). Over the past decades, the experimental results of anchoring transition caused by several external factors, such as temperature, [11] electric field [12] and photoisomerisation, [7,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] have been reported.…”

“…Each of these materials induces a distinct phenomenon. Several azo dyes, either embedded into the polymer film, [3,7,13] or dissolved in LC mixtures, [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] exhibit effective anchoring transition via illumination with polarised light. One of the effects of photoalignment involves the light-induced reorientation of the azobenzene chromophore, which is promoted by trans-cis isomerisation cycles.…”

Charge Distribution Inside Thin Liquid Crystal Layer

“…The memory effect has been also described [4][5][6]. Duration of the memory effect depends on a thickness of the isolating layer deposited onto conducting layer in a LC sandwich.…”

Asymmetric Aberration Pattern at Light-Beam Self-Action in NLC Doped with Stilbene Dye

“…It is well known that incorporation of small amounts of dyes into nematic liquid crystals (NLCs) can significantly increase the orientational optical nonlinearity and lead to new optical phenomena and applications [1][2][3][4][5][6][7][8][9][10][11]. Thus, for example, azodyes increase orientational nonlinearity of NLCs by two orders of magnitude and make it signvariable [2][3][4].…”