POLARIZATION SPECTRA OF EXCITONIC LUMINESCENCE OF BARE ZNCDSE ZNSE QUANTUM WIRES/

Linearly polarized luminescence spectra of bare (unburied) semiconduct or structures with ZnCdSe/ZnSe quantum wires, obtained by reactive ion etching, were investigated. It was found that, regardless of the orie ntation of the linear polarization of the exciting light, the luminesc ence radiation of the quantum wires is polarized parallel to the axis of the wires, while the radiation of the buffer layer of the isotropic ZnSe barrier material is oriented perpendicular to the axis of the wi res. The polarization features found are due to the modification of th e modes of the electromagnetic field near open quantum wires, which oc curs as a result of the presence of the vertical interfaces between me dia with strongly different permittivities. It was also found that, wh en linearly polarized excitation is used, the alignment of exciton dip ole moments strongly influences the polarization properties of the lum inescence. (C) 1998 American Institute of Physics. [S1063-7834(98)0340 8-X].