Abstract
Coherent phonons can greatly vary light–matter interaction in semiconductor nanostructures placed inside an optical resonator on a picosecond time scale. For an ensemble of quantum dots (QDs) as active laser medium, phonons are able to induce a large enhancement or attenuation of the emission intensity, as has been recently demonstrated. The physics of this coupled phonon–exciton–light system consists of various effects, which in the experiment typically cannot be clearly separated, in particular, due to the complicated sample structure a rather complex strain pulse impinges on the QD ensemble. Here we present a comprehensive theoretical study how the laser emission is affected by phonon pulses of various shapes as well as by ensembles with different spectral distributions of the QDs. This gives insight into the fundamental interaction dynamics of the coupled phonon–exciton–light system, while it allows us to clearly discriminate between two prominent effects: the adiabatic shifting of the ensemble and the shaking effect. This paves the way to a tailored laser emission controlled by phonons.
Highlights
At the heart of the growing field of phononics lies the active use of lattice vibrations in micro- or nanoscale solid state materials
A detailed interpretation of the coupled phonon–exciton–light system is rather sophisticated because depending on the spectral properties of the quantum dots (QDs) ensemble and the time scale associated with the phonon dynamics different phenomena contribute to the observed modulation of the laser output
In summary we have presented a systematic study of the QD laser emission properties driven by coherent phonons
Summary
Any further distribution of this work must maintain active laser medium, phonons are able to induce a large enhancement or attenuation of the emission attribution to the intensity, as has been recently demonstrated. The physics of this coupled phonon–exciton–light author(s) and the title of the work, journal citation system consists of various effects, which in the experiment typically cannot be clearly separated, in and DOI. Light system, while it allows us to clearly discriminate between two prominent effects: the adiabatic shifting of the ensemble and the shaking effect This paves the way to a tailored laser emission controlled by phonons
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