Optical Memory Based on Azo-Dye-Doped Nematic Liquid Crystals

Moghadas, F.; Khoshsima, Habib; Olyaeefar, Babak

doi:10.1080/15421406.2012.686708

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…The dielectric and electro-optical properties of nematic LCs can be modified by adding different kind of materials such as nanoparticles, dyes, polymers, carbon nanotubes (CNTs) etc. [5,6]. A suitable choice of material as a dopant for LCs constitutes a crucial part of attuning the properties of the LC material investigated.…”

Section: Introductionmentioning

confidence: 99%

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Addition of single-wall carbon nanotubes to a liquid crystal material: Impact on dielectric properties

Gürsel

Şenkal

Canlı

et al. 2015

Materials Science in Semiconductor Processing

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Section: Introductionmentioning

confidence: 99%

“…The physical properties of carbon nanotube doped LCs have been extensively investigated [5,[12][13][14][15][16][17] for electrooptical technologies. Moreover, CNTs can be utilized for achieving planar alignment, modification of the LC parameters, improving the switching speed.…”

Section: Introductionmentioning

confidence: 99%

Addition of single-wall carbon nanotubes to a liquid crystal material: Impact on dielectric properties

Gürsel

Şenkal

Canlı

et al. 2015

Materials Science in Semiconductor Processing

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“…nanoparticles, 43 dyes, polymers, carbon nanotubes (CNTs) etc. [3,4]. An appropriate their importance in the development of more efficient LC devices [5,6].…”

mentioning

confidence: 99%

Enhanced negative dielectric anisotropy and high electrical conductivity of the SWCNT doped nematic liquid crystalline material

Vimal

Pandey

Gupta

et al. 2015

Journal of Molecular Liquids

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“…However, their optical behavior significantly changes when a small amount of guest substance affects the properties of a host material 18,19 . So, the Guest-Host orientational interaction in liquid crystalline materials, by doping LC with azo dye, affects the optical properties of the LC molecules 20,21 . By controlling the transverse distribution of this kind of orientational interaction, a phase grating across the LC cell with a singularity in the center of the sample is created 22 .…”

mentioning

confidence: 99%

Optical vortex beam controlling based on fork grating stored in a dye-doped liquid crystal cell

Soleimani

Khoshsima

Yeganeh

2022

Sci Rep

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In this paper, we investigate the generation and controlling of the optical vortex beam using a dye-doped liquid crystal (DDLC) cell. The spatial distribution of the quasi-sinusoidal orientation of the liquid crystal molecules creates a quasi-sinusoidal phase grating (PG) in the DDLC cell. Depending on the incident light pattern, Trans to Cis photoisomerization of the dye molecules affects the orientation of the liquid crystal molecules. To do so, an amplitude fork grating (FG) is used as a mask, and its pattern is stored in the cell by a pattern printing method as the PG. One of the particular features of the stored grating in the cell is its capability in the diffraction efficiency controlled by the applied electric field. The results show, based on the central defect in the FG pattern, the diffracted probe beam in different orders is optical vortices. As a new technique, this type of stored pattern acts like an amplitude grating but according to the results, its structure is in fact a PG. This technique leads to the vortex beam switching capability by applying an electric field to the cell. The results show that by applying 22 V, all the diffraction orders vanish. Meanwhile, the vortex beams reappear by removing the applied voltage. The diffraction efficiency of the vortex beams as well as its generation dependency on the polarization of the incident beam studied. The maximum efficiency of the first diffraction order for linear polarized incident beam was obtained at 0 V, about 8%. Based on the presented theory, a simulation has been done which shows the Cis form of the dye molecules has been able to change the angle of LC molecules on average about 12.7°. The study of diffracted beam profiles proves that they are electrically controllable vortex beams.

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Optical Memory Based on Azo-Dye-Doped Nematic Liquid Crystals

Cited by 9 publications

References 5 publications

Addition of single-wall carbon nanotubes to a liquid crystal material: Impact on dielectric properties

Addition of single-wall carbon nanotubes to a liquid crystal material: Impact on dielectric properties

Enhanced negative dielectric anisotropy and high electrical conductivity of the SWCNT doped nematic liquid crystalline material

Optical vortex beam controlling based on fork grating stored in a dye-doped liquid crystal cell

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