Second harmonic generation in gallium phosphide photonic crystal nanocavities with ultralow continuous wave pump power

Details Second harmonic generation in gallium phosphide photonic crystal nanocavities with ultralow continuous wave pump power Second harmonic generation in gallium phosphide photonic crystal nanocavities with ultralow continuous wave pump power

2009-10-25

arxiv.org/abs/0910.4757v1

Physics

Optics

Scientific paper

We demonstrate second harmonic generation in photonic crystal nanocavities fabricated in the semiconductor gallium phosphide. We observe second harmonic radiation at 750 nm with input powers of only nanowatts coupled to the cavity and conversion efficiency $P_{\rm out}/P_{\rm in, coupled}^2 = 430%/{\rm W}$. The large electronic band gap of GaP minimizes absorption loss, allowing efficient conversion. Our results are promising for integrated, low-power light sources and on-chip reduction of input power in other nonlinear processes.

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