Dynamical optical tuning of the coherent phonon detection sensitivity in DBR-based GaAs optomechanical resonators

Article

关键词: RAMAN-SCATTERING ENHANCEMENT;    PUMP-PROBE SPECTROSCOPY;    CAVITY OPTOMECHANICS;    ROOM-TEMPERATURE;    ACOUSTIC PHONONS;    FEMTOSECOND-PUMP;    THERMALIZATION;    MICROCAVITIES;    REFLECTION;    GENERATION;   

DOI  :  10.1103/PhysRevB.92.075307

来源: SCIE

【 摘 要 】

We present a detailed time-resolved differential reflectivity study of the electronic and the coherent phonon generation response of a GaAs optical microcavity after resonant picosecond laser pulse excitation. A complex behavior is observed as a function of laser-cavity-mode detuning and incident power. The observed response is explained in terms of the large dynamical variations of the optical cavity-mode frequency induced by the ultrafast laser excitation, related to the optical modulation of the GaAs-spacer index of refraction due to photoexcited carriers. It is demonstrated that this effect leads to a strong optical dynamical tuning of the coherent phonon detection sensitivity of the device.

【 授权许可】

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