A gradual mild waveguide has strong light-weight–make a difference interaction and so can increase the nonlinear process. The analysis of your LNPhC gradual light-weight waveguide commenced from the majority LNPhC. Iliew et al. applied a bulk LNPhC As an example that the bulk bands can be utilized for section matching. https://edwinhgecw.xzblogs.com/73480000/the-greatest-guide-to-lithium-niobate-crystal