Abstract
We theoretically investigate second-harmonic generation (SHG) efficiency in a waveguide-side-coupled photonic nanocavity using coupled-mode-theory-based equations. Using an additional condition for the critical input power, we investigated SHG efficiencies at a very low input power and the critical power. At a very low input power, the SHG efficiency is enhanced by the increase in various factors for fundamental and SHG light. Conversely, the maximum SHG efficiency at the critical input power is determined by the factors for fundamental light and increases up to 50% in a waveguide-side-coupled photonic nanocavity. Our results provide a design rule for waveguide-side-coupled photonic nanocavities for developing highly efficient SHG devices.
© 2016 Optical Society of America
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