Study of all-optical switching properties of zinc phthalocyanine thin film by pump-probe technique

Publication date: 1 October 2017
Source:Optics & Laser Technology, Volume 95
Author(s): Anil Kumar, Rajesh Punia, Arun K. Gupta, Devendra Mohan, Kirti Kapoor
The nonlinear optical absorption, refraction and switching behavior of Zinc phthalocyanine (Zn(II)Pc) thin films are reported. Z-scan technique is employed to study the nonlinear absorption and nonlinear refraction behavior of the thin films with nanosecond pulses of Nd:YAG laser at ∼532nm. Optical switching behavior of the dye is studied using pump-probe technique with ∼5ns pulses of Nd:YAG at ∼532nm as the pump beam and ∼632.8nm cw He-Ne laser as the probe beam. The switching behavior of the dye is attributed to excited state absorption (ESA) of the probe beam by the dye molecules. Probe beam modulation with increasing pump intensity is also investigated.



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