Ultrafast switching of optical microcavities

In collaboration with the group of Willem Vos, we investigate several strategies to switch the resonance frequency of III-As microcavities. The underlying priciple is to induce a fast change in the refractive index of the material constituting the cavity, using a pump light pulse. To this end, several physical effects can be exploited, such as the injection of free carriers or the Kerr effect (a non-linear and instantaneous process). These researches address a broad spectrum of applications, ranging from the development of ultrafast optical switches for telecommunications to the study of more fundamental physical effects, such as the change of the color of the light field trapped in the cavity and the investigation of cavity quantum electrodynamics effects in the time domain.

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