Activity: Talk or presentation › Oral presentation
Converting light to a controllable frequency is well-known in traditional non-linear optics. In modern nanophotonics one frequency converts light which is trapped in a cavity or waveguide. Supposedly, the physics of frequency conversion differs between traditional non-linear optics and modern nanophotonics, regarding the rate of change and output spectrum. Here, we unify these disparate views. To this end, we consider a nanophotonic system, a planar microcavity, sustaining both a cavity resonance and a flat continuum of modes. We study the frequency conversion that occurs when the cavity is switched in an ultrafast way via the electronic Kerr effect . We thereby observe either a red- or a blue-shift of the confined light, depending on the timing of the pulses in the pump-probe experiment. We study color-conversion for different quality factors, which allows us to identify the role of the local density of optical states available to the generated light.