Nonlinear optical characterisation of electrospun Benzil-PMMA nanofibers

Pramod, A and Yogeswari, C and Singh, AK and Girisun, TCS and Konkada Manattayil, J and Raghunathan, V and Nagalakshmi, R (2024) Nonlinear optical characterisation of electrospun Benzil-PMMA nanofibers. In: Optics and Laser Technology, 168 .

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Abstract

Nanofibers consisting of organic benzil nanocrystals embedded inside poly methyl methacrylate polymer have been synthesised by electrospinning technique and their nonlinear properties were discussed. Second harmonic generation (SHG) was confirmed by the emission of green light, when excited with Nd:YAG laser of 1064 nm wavelength using Kurtz Perry technique for powdered sample. A surprising switch in the nonlinear absorption behaviour of the synthesised nanofibers from saturable absorption at lower intensity (0.63 × 1012 Wm−2) to reverse saturable absorption at higher intensities (1.23 × 1012 Wm−2 and 2.46 × 1012 Wm−2) were observed and the corresponding absorption coefficients were calculated. Finally, the optical limiting property of the nanofibers were analysed and the limiting threshold was found to decrease with increase in input intensity. This switching of non-linear absorption behaviour makes benzil-PMMA nanofibers a promising candidate for applications in pulse shaping, power limiting and self-pulsation in lasers.

Item Type:	Journal Article
Publication:	Optics and Laser Technology
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Benzil; Electrospinning; Nonlinear absorption; Optical limiters; Organic nanofibers; Second harmonic generation
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	09 Nov 2023 06:11
Last Modified:	09 Nov 2023 06:11
URI:	https://eprints.iisc.ac.in/id/eprint/82863

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