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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical Bistability In Evaporated Thin Films Of CDs

Yasushi Iyechika, Georg Wingen, D. Jäger, A. Witt, Claus F. Klingshirn

Published Feb 8, 1989• 6 citations
Publisher

Abstract

We report on optical bistability in thin films of evaporated CdS at 514 nm. The main mechanism is traced back to thermally induced increasing absorption. Besides all optical devices, externally controlled SEED structures are realized 'by integrated electrical con-tacts. Experimental results on the steady-state and the dynamic behavior of both types of elements are presented.

DOI
10.1117/12.947880

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Nonlinear Optical Properties of Materials•Jan 1, 1988•0 citations
We report on optical bistability in thin films of evaporated CdS at 514 nm. The main mechanism is traced back to thermally induced increasing absorption. Besides all optical devices, externally controlled SEED structures are realized 'by integrated electrical con-tacts. Experimental results on the steady-state and the dynamic behavior of both types of elements are presented.
Recently, we have discovered that the excitation of thin CdS films with the 514.5 nm line causes an all-optical bistable luminescent emission in the near infrared part of the spectrum. A first insight in mechanism and origin of all-optical bistability in luminescence of semiconductors is presented. We show that the initial and final states of the bistable luminescence are determined by the thermal properties of the luminescence intensity of the thin CdS film. However, during the bistable switch of the luminescence thermal effects and electronic ones take place. Thus, all-optical bistability in luminescence is a thermally induced electronic bistability.
It has been demonstrated that thin CdS crystal platelets at room temperature may exhibit all-optical bistability under illumination with the 514nm line of an Ar+-laser1. In this case the local heating of the sample leads to induced absorption optical bistability. In the present paper we evaporate metallic contacts on CdS crystals and apply an external bias voltage. The carriers created by the incoming light lead to a photo-current which in turn increases the temperature of the sample by electrical power via Joule's heat and thereby changes the optical properties 2,3.
All-optical photo-thermal bistabilities in the near infrared luminescence (800 nm) of a thin ( 5.5 µm) spray-pyrolyzed CdS film are studied with the 514.5 nm line of an argon laser. We report the first observation of both dispersive and absorptive luminescence bistabilities in the same CdS film. The temperature dependence of the luminescence intensity and self-focusing are found to be the origins of absorptive and dispersive luminescence bistabilities, respectively. Furthermore, it is demonstrated that the shape of the bistable response of the luminescence depends crucially on the entrance slit width of the monochromator.
The heat flow in evaporated thin film interference filters with CdS spacer and an optional CdSe absorption layer is investigated, analyzing the dynamics of optical bistability. The influence of the spot radius r of the exciting laser beam on the switching parameters is studied experimentally and theoretically. The response to pulsed excitation of the bistable devices can be described with a relaxation time τ~r and an effective nonlinearity χ~r−2 which is inversely proportional to the heat capacity of the bistable element.