We have also explored the nonlinear properties of other potentially interesting photonic materials, such as diamond, and silicon carbide (SiC). A particular interesting perspective is that both of them can serve as quantum emitters, and SiC also possesses second order nonlinearity.
Related publication:
[1] J. Cardenas, M. Yu, et al., “Optical nonlinearities in high confinement SiC waveguides,” Opt. Lett. 40, 4138 (2015).
[2] A. Shams-Ansari, et al., “Supercontinuum generation in angle-etched diamond waveguides,” Opt. Lett. 44, 4056 (2019).