Long-Lived Coherent Acoustic Phonons in Epitaxially Grown III-V Adiabatic Cavities
arxiv(2023)
摘要
We provide evidence of strongly confined coherent acoustic phonons inside
high quality factor phononic cavities that exhibit tailoredphonon potentials.
Using GaAs/AlAs quasiperiodic superlattices, these functional phonon potentials
are realized by adiabatically changing the layer thicknesses along the growth
direction. Room temperature ultrafast vibrational spectroscopy reveals discrete
phonon levels in the range of ≈ 96-101 GHz. Additionally, we confirm
that phononic cavities significantly retard the energy loss rate of the
photoexcited carriers as evidenced by time-resolved photoluminescence
measurements. These results highlight the potential of opto-phononic devices
that can bridge the divide between phononics and optoelectronics by
concurrently engineering electronic and phononic properties.
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关键词
adiabatic cavities,long-lived
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