Extraction-controlled quantum cascade lasers

Wacker, Andreas

doi:doi:10.1063/1.3483764

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A quantum dot based bright source of entangled photon pairs operating at 53 K

The exciton and biexciton lines of a single quantum dot are deterministically coupled to the optical modes of a photonic molecule. The resonance between the quantum dot emission lines and the molecule cavity modes is reached at 53 K. The device operates as a very bright source of entangled photon pairs, with an extraction efficiency of 40% for each photon of the pair. Our measurements show that the use of Purcell effect allows to quench the exciton spin relaxation during the radiative cascade, ...

Nonlinear plasmonic directional couplers

A study on the nonlinear modes of plasmonic directional couplers created by two nonlinear dielectric slot waveguides with metallic claddings is presented. The calculated power diagram shows substantial differences from the case of nonlinear dielectric couplers. The power-dependent switching and the effect of losses on the coupler performance are studied using finite-difference time-domain numerical simulations.

A simple two-well design for terahertz quantum cascade lasers is proposed which is based on scattering injection and the efficient extraction of electrons from the lower laser level by resonant tunneling. In contrast to existing designs this extraction also controls the positive differential conductivity. The device is analyzed by calculations based on nonequilibrium Green’s functions, which predict lasing operation well above 200 K at a frequency of 2.8 THz.

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KEYWORDS and PACS

Keywords

Green's function methods, quantum cascade lasers, terahertz wave devices

PACS

42.55.Px

Semiconductor lasers; laser diodes
42.60.By

Design of specific laser systems

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3483764

PUBLICATION DATA

ISSN

0003-6951 (print)

1077-3118 (online)

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American Institute of Physics

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