DIRECT OBSERVATION OF OPTICAL ANISOTROPY IN A GAAS/ALAS QUANTUM-WELL WIRE ARRAY

Using reflectance difference spectroscopy and transmittance difference spectroscopy, optical anisotropy in a quantum well wire array is directly observed at room temperature. The quantum wire array is a fractional-layer superlattice grown by metalorganic chemical vapor deposition on a vicinal (001) GaAs substrate. The size for quantum confinement of the wires is nominally 4 X 4 nm. Polarization dependence of optical absorption and refractive index is clearly observed between the directions parallel and perpendicular to the wires.