Fiber-integrated microcavities for efficient generation of coherent acoustic phonons

Abstract

Coherent phonon generation by optical pump-probe experiments has enabled the study of acoustic properties at the nanoscale in planar heterostructures, plasmonic resonators, micropillars and nanowires. Focalizing both pump and probe on the same spot of the sample is a critical part of pump-probe experiments. This is particularly relevant in the case of small objects. The main practical challenges for the actual implementation of this technique are: stability of the spatio-temporal overlap, reproducibility of the focalization and optical mode matching conditions. In this work, we solve these three challenges for the case of planar and micropillar optophononic cavities. We integrate the studied samples to single mode fibers lifting the need for focusing optics to excite and detect coherent acoustic phonons. The resulting excellent reflectivity contrast of at least 66% achieved in our samples allows us to observe stable coherent phonon signals over at least a full day and signals at extremely low excitation powers of 1uW. The monolithic sample structure is transportable and could provide a means to perform reproducible plug-and-play experiments.

8 pages, 3 figures

References in corpus (2)

• Direct Observation of Acoustic Phonon Confinement in Free-Standing Semiconductor Nanowires
• Optomechanical properties of GaAs/AlAs micropillar resonators operating in the 18 GHz range

Cited by in corpus (6)

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• Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots
• Brillouin Scattering Selection Rules in Polarization-Sensitive Photonic Resonators
• Fiber-pigtailing quantum-dot cavity-enhanced light emitting diodes
• Elliptical micropillars for efficient generation and detection of coherent acoustic phonons