Asian Journal of Physics Vol 30, No 12 (2021) 1673-1681

Nonlinear optical transmission and optical power limiting characteristics of axial bonding type tin(iv) porphyrins with different peripheral substituents at the meso-positions

M V Vijisha1, Reshma Joseph2, Sebastian Nybin Remello2 and K Chandrasekharan1
1Laser and Nonlinear Optics Laboratory, Department of Physics, National Institute of Technology Calicut, Kozhikode– 673 601, India
2Department of Applied Chemistry, Cochin University of Science and Technology, Kochi- 682 022, India

The paper is dedicated to Prof D V G L N Rao

Nonlinear optical properties of a number of dihydroxy tin(IV) porphyrins with different functional groups at the periphery have been investigated by means of single beam Z-scan technique employed with a Q-switched Nd: YAG laser delivering 7 ns pulses at 532 nm at a repetition rate of 10 Hz. Open aperture Z-scan studies show that reverse saturable absorption (RSA) is the mechanism behind the nonlinear optical absorption in all samples and excited state absorption is the major contributing factor to RSA. Nonlinear absorption coefficient was found to be higher for the tin(IV) porphyrin having carboxylate group (abbreviated as SnTCP) at the mesopositions. Optical limiting threshold value for SnTCP was estimated as ~0.67 J/cm2, which indicates its potentiality as an optical limiter for the smart filtering of optical energy in direct viewing systems. Closed aperture Z-scan results show that all the samples other than SnTPP exhibit self-defocusing nonlinearity and the magnitude of nonlinear refractive index is found to be nearly the same for all compounds. No closed aperture Z-scan signal was obtained for SnTPP, indicating that the dispersive contribution to the optical nonlinearity, in this case, is too small to be detected. © Anita Publications. All rights reserved.
Keywords: Nonlinear optical properties, Z-scan, Porphyrin, Reverse saturable absorption, self defocusing.

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Method: Single- anonymous; Screened for Plagiarism? Yes
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