Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 70: Semiconductor Lasers I

HL 70.2: Vortrag

Donnerstag, 10. März 2016, 09:45–10:00, H13

Collective enhancements in many-emitter phonon lasing. — •Leon Droenner, Nicolas Naumann, Julia Kabuss, and Alexander Carmele — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

The confinement of a single acoustic phonon mode and the acoustic analogue of lasing has been experimentally demonstrated on several platforms [1]. However, to achieve threshold-less lasing and high output intensities the strong coupling regime is necessary but still difficult to engineer. To circumvent this ingredient, we propose an N-emitter phonon laser based on a detuned excitation set-up, where either cooling or vibrational amplification can be realized [2]. We show that by detuning the optical excitation to the anti-Stokes resonance of the N-emitter ensemble, that collective enhancements become important. These enhancements are similiar to the super- and subradiance effects in optics but differ in effective density-density shifts. We pinpoint feasible excitation and coupling regimes and show that these collective shifts lead to a strongly enhanced quantum yield. Thereby, we show that the N-emitter setup is a promising route to realize highly efficient phonon lasing.

[1] K. Vahala, M. Herrmann, S. Knünz, V. Batteiger, G. Saathoff, T. W. Hänsch, Th. Udem, Nature Physics 5, 682 - 686 (2009).

[2] Nicolas L. Naumann, Leon Droenner, Alexander Carmele, Andreas Knorr, Weng W. Chow, Julia Kabuss, arXiv:1509.06910 (2015).