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We study the time-resolved reflectivity spectrum of a switched planarGaAs-AlAs microcavity. Between 5 and 40 ps after the switching (pump) pulse weobserve a strong excess probe reflectivity and a change of the frequency oflight trapped in the cavity up to 5 linewidths away from the cavity resonance.This frequency change does not adiabatically follow the fast-changing cavityresonance. The frequency change is attributed to an accumulated phase changedue to the time-dependent refractive index. An analytical model predictsdynamics in qualitative agreement with the experiments, and points to crucialparameters that control future applications.

Observation of a stronger-than-adiabatic change of light trapped in an ultrafast switched GaAs-AlAs microcavity