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VAPOR-PHASE EPITAXY; BAND-GAP REDUCTION; SEMICONDUCTOR ALLOYSScience & Technology - Other Topics; Physics; InGaAsP; ordering; polarisation; switch;
Abstract:
Recently we have shown that the quaternary semiconductor InGaAsP spontaneously forms a mono-atomic superlattice oriented in [111](B)-direction if grown under suitable conditions by MOVPE. The superlattice-induced reduction of the crystal-symmetry leads to a much larger polarisation anisotropy as in ternary III/V-semiconductors, as the ordering affects both the group-III- and the group-V-sublattice. In this contribution we report on an optoelectronic switch, based on the absorption anisotropy for [110]- and [1 (1) over bar0]-polarised light. Switching between "on" and "off" depends on the polarisation angle only, but hardly on the intensity. (c) 2006 Elsevier B.V. All rights reserved.
