Dispersion-engineered χ(2) nanophotonics: a flexible tool for nonclassical light

This article reviews recent progress in quasi-phasematched chi((2)) nonlinear nanophotonics, with a particular focus on dispersion-engineered nonlinear interactions. Throughout this article, we establish design rules for the bandwidth and interaction lengths of various nonlinear processes, and provide examples for how these processes can be engineered in nanophotonic devices. In particular, we apply these rules towards the design of sources of non-classical light and show that dispersion-engineered devices can outperform their conventional counterparts. Examples include ultra-broadband optical parametric amplification as a resource for measurement-based quantum computation, dispersion-engineered spontaneous parametric downconversion as a source of separable biphotons, and synchronously pumped nonlinear resonators as a potential route towards single-photon nonlinearities.

Automated summary

This article reviews recent progress in quasi-phasematched chi((2)) nonlinear nanophotonics, with a particular focus on dispersion-engineered nonlinear interactions. Design rules for various nonlinear processes are established, and examples are provided to show how these processes can be engineered in nanophotonic devices. Dispersion-engineered devices are shown to outperform their conventional counterparts in various applications, such as ultra-broadband optical parametric amplification and dispersion-engineered spontaneous parametric downconversion.