Abstract
The super-thermal photon bunching in quantum-dot (QD) micropillar lasers is investigated both experimentally and theoretically via simulations driven by dynamic considerations. Using stochastic multi-mode rate equations we obtain very good agreement between experiment and theory in terms of intensity profiles and intensity-correlation properties of the examined QD micro-laser’s emission. Further investigations of the time-dependent emission show that super-thermal photon bunching occurs due to irregular mode-switching events in the bimodal lasers. Our bifurcation analysis reveals that these switchings find their origin in an underlying bistability, such that spontaneous emission noise is able to effectively perturb the two competing modes in a small parameter region. We thus ascribe the observed high photon correlation to dynamical multistabilities rather than quantum mechanical correlations.
Highlights
Quantum-dot (QD) light sources based on high-Q optical microcavities are widely discussed to be future optoelectronic devices for data communication [1,2,3,4,5], and with regard to quantum communication, where they can act as sources of single photons or of entangled photon pairs
Micropillar lasers are a further step towards revolutionizing the field of laser devices which started with the development of the nowadays widely used vertical cavity surface emitting lasers (VCSEL), as there exist plentiful advantages over edge-emitting lasers e.g. in terms of ultra-low thresholds, circular beam profiles and on-wafer testing capability [6]
We clearly show that the nonlinear dynamics of these nanostructured devices can be described with relatively simple rate equations adapted from the well known two-mode ring laser [12,13,14] and VCSEL [6, 7, 15,16,17] models
Summary
The super-thermal photon bunching in quantum-dot (QD) micropillar lasers is investigated both author(s) and the title of the work, journal citation experimentally and theoretically via simulations driven by dynamic considerations. Multi-mode rate equations we obtain very good agreement between experiment and theory in terms of intensity profiles and intensity-correlation properties of the examined QD micro-laser’s emission. Further investigations of the time-dependent emission show that super-thermal photon bunching occurs due to irregular mode-switching events in the bimodal lasers. Our bifurcation analysis reveals that these switchings find their origin in an underlying bistability, such that spontaneous emission noise is able to effectively perturb the two competing modes in a small parameter region. We ascribe the observed high photon correlation to dynamical multistabilities rather than quantum mechanical correlations
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