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Proceedings Paper

Optical nonlinearity and power limiting in organic molecules and nanocomposites
Author(s): Reji Philip; Jayan Thomas
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Paper Abstract

Nonlinear optical transmission in materials has several applications including laser mode-locking, pulse shaping, optical bistability, optical switching, and optical power limiting. Organic molecules suitable for functionalization have been extensively investigated for their third order nonlinearities. We have measured the optical nonlinearity of different novel organic and composite systems including nanocomposite polymer films of Au, Ag and Pt, Organic ionic crystals (pyridinium and quinolinium salts), Au-alkanethiol clusters, thiophene based polymers, and Schiff base complexes, using the z-scan and degenerate four wave mixing techniques, employing laser pulses of nanosecond and femtosecond durations respectively. Most of these materials are found to be efficient optical power limiters under our excitation conditions, and their nonlinear extinction coefficients have been calculated. Enhancement in the optical nonlinearity was sometimes obtained even by mixing of two organic media. From degenerate four wave mixing experiments, the third order nonlinear susceptibility χ(3) and figure of merit χ(3)/α values also have been determined for some of these materials. The above experiments conducted in a large number of organic and composite materials unravel the potential of these media for diverse photonic applications.

Paper Details

Date Published: 16 September 2011
PDF: 7 pages
Proc. SPIE 8113, Linear and Nonlinear Optics of Organic Materials XI, 81130J (16 September 2011); doi: 10.1117/12.897117
Show Author Affiliations
Reji Philip, Raman Research Institute (India)
Jayan Thomas, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Univ. of Central Florida (United States)

Published in SPIE Proceedings Vol. 8113:
Linear and Nonlinear Optics of Organic Materials XI
Jean-Michel Nunzi; Rachel Jakubiak; Theodore G. Goodson III; Manfred Eich, Editor(s)

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