Ultra-broadband dispersion engineering of nanophotonic waveguides.

We propose double-cladded and multi-cladded waveguide structures that enable flexible engineering of group-velocity dispersion over multi-octave spanning spectral range, allowing to produce intriguing dispersion characteristics that oscillate between normal and anomalous dispersion in a sinusoidal-like fashion with controllable magnitude, which will be very useful for nonlinear photonic applications. The proposed waveguides are easy to fabricate in practice, which we expect to have great potential for broad applications in nonlinear photonics, quantum optics, and optical communication.