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Published on: July 12, 2017
Second harmonic generation in gallium phosphide photonic crystal nanocavities with ultralow continuous wave pump
Kelley Rivoire1, Ziliang Lin, Fariba Hatami
1E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305-4085, USA. krivoire@stanford.edu
Abstract:
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 effciency P(out)/P(2)(in,coupled)=430%/W. The large electronic band gap of GaP minimizes absorption loss, allowing effcient conversion. Our results are promising for integrated, low-power light sources and on-chip reduction of input power in other nonlinear processes.
