Nonlinear optical and optical power limiting studies on a new thiophenebased conjugated polymer in solution and solid PMMA matrix

Poornesh, P and Hegde, Pramod K and Umesh, G and Manjunatha, M G and Manjunatha, K B and Adhikari, A V (2010) Nonlinear optical and optical power limiting studies on a new thiophenebased conjugated polymer in solution and solid PMMA matrix. Optics & Laser Technology, 42 (1). pp. 230-236. ISSN 0030-3992

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Abstract

An experimental investigation of the third-order nonlinear optical properties of new poly{2-{5-[3,4-ditetradecyloxy-5-(1,3,4-oxadiazol-2-yl)thiophen-2-yl]-1,3,4-oxadiazol-2-yl}pyridine} (P) in tetrahydrofuran (THF) solution and in solid poly(methylmethacrylate) (PMMA) matrix, by Z-scan technique is reported. The Z-scan traces reveal that the composite films exhibit large negative nonlinear refractive index of the order 10�10 esu. The excited-state absorption cross-section was found to be larger than the ground-state absorption indicating that the operating nonlinear process is reverse saturable absorption (RSA). The new polymer P exhibits good optical power limiting properties in the nanosecond regime in solution and as well in solid PMMA matrix.

Item Type: Article
Uncontrolled Keywords: Nonlinear optics Z-scan Reverse saturable absorption (RSA)
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 20 Aug 2013 09:00
Last Modified: 20 Aug 2013 09:00
URI: http://eprints.manipal.edu/id/eprint/136826

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