Investigation of third-order nonlinear optical properties of conjugated benzodioxal derivatives

Shettigar, Seetharam and Poornesh, P and Umesh, G and Sarojini, B K and Narayana, B and Kamath, Prakash K (2010) Investigation of third-order nonlinear optical properties of conjugated benzodioxal derivatives. Optics & Laser Technology, 42 (7). pp. 1162-1166. ISSN 0030-3992

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Abstract

An investigation of third-order nonlinear optical characterization of newly synthesized conjugated benzodioxal derivatives has been done by using nanosecond Z-scan technique at 532 nm. The molecules demonstrate self-defocusing effect with intensity dependent refractive index (n2) of the order of 10−14 cm2/W. The measured molecular TPA cross-section is ranging from 2.47 ×10−47 cm4 s/photon to 6.00 cm4 s/photon. Their input-output curves indicate that there is a clear optical power limiting behavior with the limiting threshold in the range 125–181 μJ. The main factor to exhibit the observed nonlinearity in these molecules is the presence of charge donor and acceptor groups. The increased conjugation length increases the nonlinear refraction and increased electron density enhances the nonlinear absorption. The molecules exhibit good nonlinear optical properties, comparable to those of regular azoaromatic compounds. Therefore, the molecules investigated here are promising candidates for optical power limiting devices.

Item Type: Article
Uncontrolled Keywords: Conjugated systems; Third-order susceptibility; Optical power limiting
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 20 Aug 2013 09:05
Last Modified: 20 Aug 2013 09:05
URI: http://eprints.manipal.edu/id/eprint/136822

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