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Anomalous large nonlinearity of thin SnCl2 phthalocyanine films observed upon pulsed laser excitation

The nonlinear susceptibility of thin stannum dichloride phthalocyanine (SnCl2Pc) films was studied by the method of degenerate four-wave mixing (DFWM) using the second-harmonic 532-nm, 10-ns pulses from a single-mode, TEM00, 1.5-mJ Nd3+:YAG laser and by the method of nonlinear lens (the Z-scan method). The intensity of the first-order self-diffraction upon the DFWM on dynamic gratings induced in SnCl2Pc films has a cubic dependence on the recording-beam intensity, indicating to the third-order nonlinear response of the films. The value of the nonlinear susceptibility χ(3)(ω;ω,-ω,ω)=(4.4 ± 0.5) × 10-7 esu noticeably exceeds this value for phthalocyanines known in the literature. The mechanisms that can be responsible for the nonlinear response of the new synthesised material are discussed.