The Purcell effect, acceleration of a spontaneous emission recombination rate, has been observed in InN/In nanocomposites with buried nanoparticles of metallic In. This effect, associated with localized plasmons, is characterized by the averaged Purcell factor as high as 30-40 in the structures with large enough particles. This high value is indicative of a noticeable contribution from the emitting dipoles polarized normally to the nanoparticle surface in this system. The experimental observation of shortening of the emission lifetimes with increasing the amount of In is supported by calculations performed in a semiclassical approximation

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The results of theoretical and experimental study of the impurity photocurrent peaks in the spectral region corresponding to the longitudinal optical phonon energy in bulk GaAs and GaAs quantum wells doped with silicon are presented. The general expression to describe these impurity photocurrent peaks is derived. It is shown that the suggested theory adequately describes the impurity photocurrent peaks observed in bulk GaAs. We demonstrate that the photocurrent peak width in a quantum well structure is greater than that in a bulk semiconductor.

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