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HL: Fachverband Halbleiterphysik
HL 51: Semiconductor lasers I
HL 51.2: Vortrag
Mittwoch, 18. März 2020, 15:15–15:30, POT 51
Thresholdless transition to coherent emission at telecom wavelength from metallic cavity nanolasers — •Frederik Lohof1, Sören Kreinberg2, Kaisa Laiho2, William Hayenga3, Paweł Holewa2, Mercedeh Khajavikhan3, Stephan Reitzenstein2, and Christopher Gies1 — 1Institute for Theoretical Physics, University of Bremen — 2Institute for Solid State Physics, Technical University Berlin — 3CREOL, Univerity of Central Florida
The miniaturization of semiconductor nanolasers has created an avenue to (near) thresholdless devices with small footprints for applications in photonics and quantum information. In this regime, the onset of coherent emission, i.e. the threshold, must be determined from a change in the photon statistics of the emission, as output intensity and linewidth provide ambiguous information. We present results from theoretical and experimental studies of telecom wavelength, thresholdless coaxial nanolasers using metallic cavities. These cavities allow to confine light on length scales below the diffraction limit, leading to high field intensities and large light-matter interactions. Our theoretical modeling gives access to time-resolved photoluminescence and fingerprints of the emission’s photon statistics, given by photon-correlation functions. In modeling of the experimentally obtained data, we demonstrate a clear onset of coherent emission at finite pump powers. Our combination of experimental and theoretical techniques results in a comprehensive picture of the device dynamics, verifying its lasing operation and providing directions for future experimental designs of nanolasers.