Abstract
A numerical model describing the spatial resolution limitations on localized band edge photoluminescence (PL) and trap-based luminescence, obtained through near-field scanning optical microscopy (NSOM), is presented. Calculations were carried out for NSOM measurements performed in the tip illumination mode. Variations in surface recombination velocity, probe aperture, and the physical structure on the achievable spatial resolution were investigated. These calculations indicate that the drift of photogenerated minority carriers to the surface narrows their lateral distribution, leading to improved spatial resolution. There is a weak dependence on the spatial resolution of the photoluminescence on the tip aperture. An order of magnitude reduction of the illuminating tip aperture resulted in only a minor improvement in the lateral spatial resolution of the emitted PL. The spatial resolution of the localized trap luminescence is presented within the context of typical material structures.
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