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Springer proceedings in physics

Fast All-Optical Switching at Extremely Low Switching Energy in CdS Platelets

M. Dagenais, Wayne F. Sharfin

Published Jan 1, 1986• 3 citations
Publisher
DOI
10.1007/978-3-642-46580-2_34

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Conference on Lasers and Electro-Optics•Jan 1, 1985•0 citations
Using a laser slightly detuned from the I2 bound exciton resonance in CdS, we report the observation of the lowest switching energy (< 4 pJ) for an all-optical bistable device. The deconvoluted switching-on and -off times are evaluated to be less than 1 and 2 ns respectively. Even shorter switching times are expected, and we are presently improving our time resolution. Forward, degenerate four-wave mixing experiments were also performed near the I2 bound exciton, an exciton bound to a neutral donor. A four-wave mixing signal was observed with less than 50 W/cm2 incident on the sample.
The switching dynamics of thermally induced optical bistability due to increasing absorption is investigated in thin CdS platelets, at room temperature. Fast and slow components can be observed during the switching process, they depend on the holding point intensity and on the switching pulse energy. It is shown that the transverse relaxation of the temperature in the sample influences this dynamics. The spectral shift of the band to band absorption edge, at the origin of the bistable behavior, is observed in a three beam experiment.
We report the fastest ON/OFF switching bistable optical device yet demonstrated. The device consists of a 13-μm thick CdS platelet in a Fabry-Perot cavity formed by two external mirrors with 90% reflectivity. Very well-defined OM and OFF states with switching times of < 1 nsec (ON) and 2 nsec (OFF) are observed when the laser frequency is tuned to within about one halfwidth below the inhomogeneously broadened bound exciton resonance in CdS. In Fig. 1, the Input and output pulse forms are shown revealing the fast switching.