Abstract
We report optical transmission measurements performed with a He-Ne laser on epitaxial and spray deposited thin (2–10 μm) CdS layers at room temperature. Oscillations with a frequency of ≤10 Hz in the transmission response were detected under a constant low intensity (≤2.5 W cm -2) illumination. The oscillations disappear if the samples are heated up to 350 K. For an applied voltage (10–100 V) the oscillation frequency varied within 0.2-0.02 Hz. On the other hand the amplitude of the oscillations remains unchanged by the applied voltage. Frequency and amplitude can be tuned by the light intensity. Arguments are presented that the measured transmission oscillations are maybe not only a new reported effect restricted to CdS layers but a discovery of a new light induced effect in semiconductors.
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