Abstract
We report the first investigation of electro-optical properties of Cd1−xMnxTe films, prepared by the ionized-cluster beam deposition technique. Measurements of the birefringence Δn of the films were performed under applied electric field in the wavelength region from 800 to 450 nm. Major results obtained are as follows: The value of Δn rises to second power against the applied electric field, and for a film with x=0.77 a large quadratic electro-optical coefficient of 3.5×10−12 cm2/V2 is obtained at 633 nm. The wavelength dispersion of Δn is observed near its band gap, suggesting that the electro-optical properties of these films are caused by the Franz–Keldysh effect.
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