Nonlinear absorption in certain metal phthalocyanines at resonant and near resonant wavelengths

Nonlinear absorption present in two bis-phthalocyanines viz. Sm(Pc) 2, and Eu(Pc) 2, dissolved in dimethyl formamide, is studied for a number of wavelengths in the lower wavelength side of the Q-band of their linear absorption spectrum using open aperture Z-scan technique. It was observed that while...

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Bibliographic Details
Published in:Optics communications 2003-03, Vol.217 (1), p.269-274
Main Authors: Unnikrishnan, K.P, Thomas, Jayan, Nampoori, V.P.N, Vallabhan, C.P.G
Format: Article
Language:English
Subjects:
electro-optics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optical susceptibility, hyperpolarizability
Optics
Physics
polarization-optical coefficients
refractive index
Sn2P2S6
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Summary:Nonlinear absorption present in two bis-phthalocyanines viz. Sm(Pc) 2, and Eu(Pc) 2, dissolved in dimethyl formamide, is studied for a number of wavelengths in the lower wavelength side of the Q-band of their linear absorption spectrum using open aperture Z-scan technique. It was observed that while Eu(Pc) 2 exhibited reverse saturable absorption at 604 nm, Sm(Pc) 2 showed saturable absorption though both samples have similar structures. Saturation intensity I s, nonlinear absorption coefficient β and imaginary part of third order nonlinear susceptibility Im[ χ (3)], were also measured at different wavelengths for these samples. It was also observed that resonant enhancement effect is higher in the case of Sm(Pc) 2 than that in Eu(Pc) 2.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(03)01098-8