Abstract
We investigate an optically induced distributed-feedback cavity, containing a densely packed luminescent silicon nanocrystal layer in a SiO2 based matrix as active medium. In the presence of optical feedback, we have observed a nonlinear increase in the spectrally resolved emission intensity on the blue emission wing, which consists of two main contributions: (i) a broad amplified region around 550nm, showing fast photoluminescence decay around 100ns, depending on the excitation intensity, and (ii) a narrower peak located at about 580nm. The latter exhibits a spectral shift, which varies with the cavity tuning.
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