Abstract

Optical frequency conversion in semiconductor nanophotonic devices usually imposes stringent requirements on fabrication accuracy and etch surface roughness. Here, we adopt the concept of bound-state-in-continuum (BIC) for waveguide frequency converter design, which obviates the limitations in nonlinear material nano-fabrication and requires to pattern only a low-refractive-index strip on the nonlinear slab. Taking gallium phosphide (GaP) as an example, we study second-harmonic generation using horizontally polarized pump light at 1.55 µm phase matching to vertically polarized BIC modes. A theoretical normalized frequency conversion efficiency of $1.1 \times {10^4}\% \;{{\rm{W}}^{- 1}}{\rm{c}}{{\rm{m}}^{- 2}}$ is obtained using the fundamental BIC mode, which is comparable to that of conventional GaP waveguides.

© 2021 Optical Society of America

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