Electro-Optical Behavior of Dye Doped Nematic Liquid Crystal

Yadav, S.P.; Pandey, Kamal Kumar; Misra, Abhishek Kumar; Manohar, Rajiv

doi:10.12693/aphyspola.119.824

Cited by 22 publications

(6 citation statements)

References 26 publications

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“…where L is the distance between two electrodes, d is the thickness of liquid crystal layer, k 11 is the splay elastic constant, ε a is the dielectric anisotropy, and ε 0 is the electric permittivity in free space [30]. Using the values of 5CB, k 11 = 5.24 × 10 -12 N, ε a = 11.92, and ε 0 = 8.85×10 -12 F/m, the threshold voltage v th = 0.7 V can be calculated [31]. The phase shift is given by…”

Section: Resultsmentioning

confidence: 99%

“…However, there are some studies showing that if the coating layer can be oxidized/reduced by the electric field, the threshold voltage will decrease significantly [34]. The threshold voltage of the liquid crystal cell depends on anchoring energy from the alignment layer, the species of the liquid crystals, and the composition of the liquid crystals [30,31]. In order to understand this discrepancy, further studies are required.…”

Section:  mentioning

confidence: 99%

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Graphene/liquid crystal based terahertz phase shifters

Wu¹,

Ruan²,

Chen³

et al. 2013

Opt. Express

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Due to its high electrical conductivity and excellent transmittance at terahertz frequencies, graphene is a promising candidate as transparent electrodes for terahertz devices. We demonstrate a liquid crystal based terahertz phase shifter with the graphene films as transparent electrodes. The maximum phase shift is 10.8 degree and the saturation voltage is 5 V with a 50 µm liquid crystal cell. The transmittance at terahertz frequencies and electrical conductivity depending on the number of graphene layer are also investigated. The proposed phase shifter provides a continuous tunability, fully electrical controllability, and low DC voltage operation.

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Section: Resultsmentioning

confidence: 99%

Section:  mentioning

confidence: 99%

Graphene/liquid crystal based terahertz phase shifters

Wu¹,

Ruan²,

Chen³

et al. 2013

Opt. Express

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“…The temperature dependence of relaxation time follows Arrhenius law which is given by equation (8) [27][28][29]:…”

Section: Relaxation Time and Activation Energymentioning

confidence: 99%

“…However the use of liquid crystals in different devises depends upon various properties owned by them like order parameter, dielectric permativity, dielectric anisotropy, birefringent behavior, optical transmittance, elastic constants etc [6]. Most applications of liquid crystals depend upon the possibilities of changing orientation of the liquid crystal molecules by the applied electric fields, which in turn depends on the visco-elastic and electrical properties [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Physical Properties of Pure and Nano Ag Doped Liquid Crystalline Compounds Containing 1,3,4-Oxadizole Unit

Ja¹,

Ta²,

Ia³

et al. 2015

Chem Sci J

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Dielectric properties and other physical properties such as electrical conductivity (AC) and relaxation time or activation energy have been studied for two systems pure LC [V] 6,6 , [V] 7,6 , [V] 8,6 , [V] 6,7 , [V] 7,7 and [V] 8,7 and their doped with silver nanoparticles. The results show the increasing in real dielectric permittivity έ with increasing length terminal chain. So the real dielectric permittivity increasing with raising temperature. To compare between the values of at (400) Hz and (4000) Hz we observe these values at the low frequency are larger than that in high frequency. Generally, one can see that the doping of Ag nano particles effectively reduced the permittivity of the LC materials with its large electric dipole moment. The electrical conductivity value for pure LC samples in general increases with increasing temperature. So we observed increasing of electrical conductivity values at high frequency. The time scale is discussed in terms of the Arrhenius plot. Generally, with increasing the temperature the time period that spend by molecules at the transition state will increase. The activation energy Ea values show the increase in the activation energy to the doped systems.

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“…Various studies have been done to study the effects of dye, C 60 , polymer, carbon nanotube (CNT) and their combinations on liquid crystal properties [7][8][9][10][11][12][13][14][15][16]. Our group has also reported the effect of dye and nano particles on the dielectric and optical properties of nematic liquid crystals [14][15][16][17]. The refractive indices, order parameter, density and optical transmittance for pure nematic mixture E-24 have already been published by our group [18].…”

Section: Introductionmentioning

confidence: 99%

Optical Studies of a Pure and Dye Doped Nematic Liquid Crystal E-24

Chandel¹,

Manohar²,

Shukla³

et al. 2012

Transactions on Electrical and Electronic Materials

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The present paper reports the comparative optical behavior of a pure nematic mixture E-24 and its anthraquinone dye doped sample. The variation in the ordinary and extraordinary refractive index (n o , n e ) of the pure and dye doped samples with temperature has been discussed and it has been found that doped sample have a less refractive index compared to the pure sample. The variation in the order parameter for pure and doped samples with temperature has been discussed and it has been seen that the doped sample has a higher order parameter; the possible reasons have been discussed. The variations in birefringence and optical transmittance have also been presented here.

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Electro-Optical Behavior of Dye Doped Nematic Liquid Crystal

Cited by 22 publications

References 26 publications

Graphene/liquid crystal based terahertz phase shifters

Graphene/liquid crystal based terahertz phase shifters

Physical Properties of Pure and Nano Ag Doped Liquid Crystalline Compounds Containing 1,3,4-Oxadizole Unit

Optical Studies of a Pure and Dye Doped Nematic Liquid Crystal E-24

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