Abstract
Optical properties of α- and β-particle irradiated doped superlattices (npnp) were studied by photoluminescence, ellipsometry, and Raman spectroscopy. Irradiation causes a substantial shift of the main emission band. Single-wavelength ellipsometry shows a small drop in extinction coefficient, but no measurable change in real index of refraction or in depletion width between n and p layers. Thermal annealing at 450 K results in the formation of a new emission band at 1.51 eV. High temperature annealing reverses all radiation induced changes.
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