Setting up Z-scan experiment to study nonlinear optical properties of polymer composites: Characterization of ADP doped PVA/PVP polymer films

Gowtham, G. K.; Somashekarappa, H.; Namboodiri, C. K. R.; Somashekar, R.K.

doi:10.1063/1.5028794

Cited by 2 publications

(1 citation statement)

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“…The nonlinear response of silk cocoon and films was recorded directly while the fibre threads were bound together tightly onto the sample holder. 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%