Anomalously Large Pockels Effect in ZnO-F Single Crystalline Films Deposited on Bare Glass

Large linear electrooptics (the Pockels effect) of up to 17 pm/V for the wavelength 435 nm has been observed in ZnO films doped by fluorine and deposited on bare glass. In order to describe the phenomenon observed, a complex approach, including self-consistent band structure calculations together with the appropriate molecular dynamics simulations of the interfaces, was applied. The origin of the effect observed is linked to substantial charge density non-centrosymmetry between the wurtzite-like crystalline films and the bare glass substrate, as well as to additional charge density polarisation caused by the fluorine. Keywords: large electrooptics, ZnO, crystalline films, glass (Received January 15, 2002; Accepted February 6, 2002)

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