## [#  Nonlinear Nanophotonics 

 ](/research-areas/nonlinear-nanophotonics)

Creation of light-controlling-light devices can be achieved at high speed by way of the optical Kerr effect. This nonlinear optical process changes the effective index of refraction based on the intensity of an optical pulse. Using this, two otherwise non-interacting pulses can influence one another's velocity while traveling through a nonlinear medium, thus a single pulse accumulates a different phase shift than two co-propagating pulses of twice the intensity. Coupling this effect with optical interference, it becomes possible to create all optical logic operations.