Mid-infrared frequency conversion in quasiphase matched semiconductors

Quasinormal-Mode Non-Hermitian Modeling and Design in Nonlinear Nano-Optics

“…Then a lithographic etching process is used to locally define a spatial distribution of alternative (−100) and (100) domains on the surface, which provides a template to further grow the desired OP-heterostructure. We note that quasi-phase matching has been successfully demonstrated in GaAs waveguides with low propagation losses . Note that, in microdisks and waveguides, the phase matching condition results in a fully periodic pattern, in contrast with our subwavelength scale design that considers evanescent and progressive waves and results in an aperiodic χ (2) pattern.…”

“…We note that quasi-phase matching has been successfully demonstrated in GaAs waveguides with low propagation losses. 56 Note that, in microdisks and waveguides, the phase matching condition results in a fully periodic pattern, in contrast with our subwavelength scale design that considers evanescent and progressive waves and results in an aperiodic χ (2) pattern. As reported in ref 54, the fabrication of OP-GaAs films is challenging, owing to the difficulty of achieving vertical etches of GaAs films and ensuring smooth interfaces between (−100) and (100) domains during the regrowth.…”