Lund, Anders Mølbjerg1; Nielsen, Per Kær1; Lorke, Michael2; Tromborg, Bjarne1; Mørk, Jesper1
1 Department of Photonics Engineering, Technical University of Denmark2 Nanophotonics Theory and Signal Processing, Department of Photonics Engineering, Technical University of Denmark
We investigate the dynamical properties of nanolasers comprising a few two-level emitters coupled to an optical cavity. A set of rate equations is derived, and is shown to agree very well with a solution of the full master equation model. Using a linearized version of these rate equations, we can analytically express the response of the nanolaser to a modulation of the pumping rate. These results are compared with the modulation response obtained directly from the master equation using a novel method. We show that contrary to conventional semiconductor lasers, the nanolaser is typically over-damped and displays a dip in the modulation bandwidth as the two-level systems become inverted. Both these features can be traced back to the use of discrete emitters that are incoherently pumped.
I E E E Journal of Quantum Electronics, 2013, Vol 49, Issue 11, p. 945-954
Laser theory; Quantum dot lasers; Atom lasers; Nanoscale devices