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Third-order optical nonlinearities in methoxy-substituted 1,3 diphenyl propenones by Z-scan and Optical Limiting studies

K. N. SHARAFUDEEN1, G. R. C. REDDY1, K. CHANDRASEKHARAN1,*

Affiliation

  1. Nonlinear optical properties, Z-scan, Two-photon absorption, Optical limiting, Nonlinear refractive index

Abstract

Employing the single beam Z-scan technique with nanosecond laser pulses at 532nm, the refractive and absorptive nonlinearities of methoxy-substituted (2E)-1-(3,4-dimethoxyphenyl)-3-phenylprop-2-en-1-one have been studied. The methoxy substitution makes 3,4-dimethoxy chalcone derivatives a donor-acceptor-donor (D-A-D) type intramolecular charge transfer molecule. The sign of the nonlinear index of refraction ( 2 n ) is found to be negative and the magnitude 2 n is of the order of 10-11 esu. The variation of NLA coefficient ( ) βeff with input intensity ( ) 0 I is studied and the nonlinear absorption mechanism is found to be sequential two-photon absorption(TPA) leading to thermal effects in the solutions. The enhancement of nonlinearity due to the methoxy substitution is in accordance with the dipole-like formation in the said molecules. The compounds exhibit good optical limiting as well..

Keywords

Nonlinear optical properties, Z-scan, Two-photon absorption, Optical limiting, Nonlinear refractive index.

Submitted at: Feb. 9, 2009
Accepted at: May 28, 2009

Citation

K. N. SHARAFUDEEN, G. R. C. REDDY, K. CHANDRASEKHARAN, Third-order optical nonlinearities in methoxy-substituted 1,3 diphenyl propenones by Z-scan and Optical Limiting studies, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 5, pp. 666-672 (2009)