Non Linear Optical Properties of Banana Shaped Liquid Crystals

Nagappa,; Mahadeva, J.; Somashekar, R.; Yalemaggad, C. V.; Umesh, G.; Manjunatha, K.

doi:10.1080/15421406.2011.568341

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…The detector, which was placed beyond the sample, recorded the transmitted data [26]. The normalised transmittance T(z) is given by [27], z 0 is the Rayleigh length, I 0 is on-axis peak irradiance at focus, α is the linear absorption coefficient, L is the thickness of the sample, β eff is the nonlinear absorption coefficient obtained by fitting the experimental data using equation (3).…”

Section: Resultsmentioning

confidence: 99%

Investigation on optical switching behaviour of regenerated and non-regenerated silk by nanosecond Z-scan technique

Gowtham¹,

Urs²,

Raghavendra³

et al. 2021

Phys. Scr.

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The nonlinear optical behaviour of silk, a natural fibre, is investigated in this study. We have considered silk in the cocoon, fibre and film forms of bivoltine and multivoltine breeds. The nonlinear absorption and optical limiting studies were performed using the open aperture Z-scan technique at 1064nm. Interestingly, silk in cocoon and fibre form possess saturable absorption (SA), whereas silk in the film form exhibits reverse saturable absorption (RSA). This shift is attributed to the removal of sericin during the regeneration of silk into a film. Further, silk films exhibit optical limiting behaviour, whose limiting thresholds are in the order of 1012 W/cm2. Functional data analysis (FDA), a statistical approach, is employed to draw correlations amongst physical parameters. FDA offers good insight into the dependencies between silk varieties and their optical parameters. This helps in identifying the sample possessing the best properties.

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Section: Resultsmentioning

confidence: 99%

Investigation on optical switching behaviour of regenerated and non-regenerated silk by nanosecond Z-scan technique

Gowtham¹,

Urs²,

Raghavendra³

et al. 2021

Phys. Scr.

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“…, where L is sample thickness, Z is sample position and Z 0 is Rayleigh length. Specifically, the normalized transmittance as a function of sample position is given by the equation 16 F I G U R E 2 Left: X-ray diffraction pattern of polymer composites. Right: FTIR spectra of the polymer composites [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Data On Parameters and Preliminary Analysismentioning

confidence: 99%

“…The curves were obtained by fitting () to the data using the method of nonlinear least squares, resulting in measurement values for the two‐photon nonlinear absorption coefficient β eff ≡ β and linear absorption coefficient α via the relation

L_{eff} = \frac{(1 - e^{italicαL})}{α}

, where L is sample thickness, Z is sample position and Z 0 is Rayleigh length. Specifically, the normalized transmittance as a function of sample position is given by the equation 16

T ((), Z) = \frac{\ln ((), 1 + q_{0} ((), Z))}{q_{0} ((), Z)}, q_{0} ((), Z) = \frac{I_{0} β_{eff} L_{eff}}{(1 + x^{2})},

where ∣ q 0 ( Z ) ∣ < 1 with x = Z / Z 0 and I 0 is peak on‐axis irradiance at the focus.…”

Section: Data On Parameters and Preliminary Analysismentioning

confidence: 99%

Measure of polymer performance based on correlated physical parameters

Gowtham

Somashekarappa

Bharath

et al. 2021

J of Applied Polymer Sci

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We introduce a novel measure of performance of polymer composites based on physical parameters whose behavior depends on levels of dopant concentration used during their preparation. The performance measure is based on a joint analysis of measurements of the physical parameters exhibiting non-trivial correlations that vary across different levels of dopant concentrations. In contrast to traditional multivariate analysis, we treat data from parameter measurements as being obtained from functional parameters, and develop the performance measure based on the joint average function of parameters that encodes the correlation structure. An optimal level of dopant concentration is then ascertained with respect to the performance measure. While the proposed measure is general enough to be applicable to any chosen physical parameters, we demonstrate its utility in the context of assessing performance using microstructural and nonlinear optical parameters.Computing of the measure and optimal dopant concentration are carried out using Monte Carlo sampling, which further facilitates uncertainty quantification.

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“…The LCs were also used as carrier materials in the examination of nonlinear optical properties/parameters (e.g., nonlinear refractive index and nonlinear optical absorption) [2] of organic molecules. For the active matrix LCD applications, such as thin-film-transistor (TFT), and metal-insulator-metal (MIM), "fluoro" is the preferred polar group as it exhibits a high resistivity, low viscosity, and low birefringence [3].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Picture of Structural and Electrochemical Properties of Fluorinated Liquid Crystals - a Theoretical Study

Prasad

Ojha

2017

Acta Phys. Pol. A

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A comparative picture of structural and electrochemical properties of fluorinated liquid crystals viz.p-phenylene-4-methoxybenzoate-4-trifluoromethylbenzoate (FLUORO1), and 4-propyloxyphenyl-4-(4-trifluoromethyl benzoyloxy) benzoate (FLUORO2) have been studied. The structure of liquid crystals have been optimized by the density functional B3LYP with 6-31 + G(d) basis set using crystallographic geometry as input. Molecular charge distribution, and phase stability of these molecules have been analyzed based on the Mulliken, and Loewdin population analysis. The electronic absorption spectra of molecules have been simulated by employing the density functional theory method. The effects of substituted groups on electrochemical properties such as highly occupied molecular orbital, lowly unoccupied molecular orbital energies, and energy gap (Eg) have been investigated. It has been observed that substitution of additional alkyl groups leads to prominent decrement in electrochemical properties.

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Non Linear Optical Properties of Banana Shaped Liquid Crystals

Cited by 11 publications

References 11 publications

Investigation on optical switching behaviour of regenerated and non-regenerated silk by nanosecond Z-scan technique

Investigation on optical switching behaviour of regenerated and non-regenerated silk by nanosecond Z-scan technique

Measure of polymer performance based on correlated physical parameters

A Comparative Picture of Structural and Electrochemical Properties of Fluorinated Liquid Crystals - a Theoretical Study

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