Optical gain in dye-impregnated oxidized porous silicon waveguides

Oton, C.J., Navarro-Urrios, D., Capuj, N.E., Ghulinyan, M., Pavesi, L., González-Pérez, S., Lahoz, F. and Martín, I.R. (2006) Optical gain in dye-impregnated oxidized porous silicon waveguides. Applied Physics Letters, 89 (11107), 1-3. (doi:10.1063/1.2219121).

Abstract

Positive optical gain under pulsed excitation in oxidized porous silicon planar waveguides impregnated with Nile blue (LC 6900) is reported. Amplified spontaneous emission measurements show a dramatic line narrowing when the pump energy is increased, together with a strong superlinear behavior. Variable stripe length measurements were performed to characterize quantitatively the amplification, and an unambiguous transition from losses to gain is observed with a threshold of ~3 mJ/cm (~40 dB/cm) is reported. Shifting excitation spot measurements confirm the reliability of our results. This system is interesting in view of an optically pumped silicon-based pulsed laser.

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