Supercontinuum generation in strip/slot hybrid waveguide with flat and low dispersion.

A strip/slot hybrid waveguide with double horizontal silicon nanocrystals slots is proposed to achieve flat and low dispersion with four zero dispersion wavelengths. By tuning structural parameters of the waveguide, dispersion tailoring is fully characterized. The flat dispersion varying between -13 and 14  ps/(nm·km) is obtained over an 845 nm bandwidth. A broadband supercontinuum spectrum, spanning from 1.15 to 3.65 μm in the -15  dB level, was generated in this waveguide pumped by a femtosecond pulse at 1.86 μm. Results indicate that the waveguide has great potential in near- and mid-infrared nonlinear applications.