Quantum dot spontaneous emission control in a ridge waveguide

We investigate the spontaneous emission (SE) of self-assembled InAs quantum dots (QDs) embedded in GaAs ridge waveguides that lay on a low index substrate. In thin enough waveguides, the coupling to the fundamental guided mode is vanishingly small. A pronounced anisotropy in the coupling to non-guid...

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Veröffentlicht in:Applied physics letters 2015-01, Vol.106 (4), p.41112-121108
Hauptverfasser: Stepanov, Petr, Delga, Adrien, Zang, Xiaorun, Bleuse, Joël, Dupuy, Emmanuel, Peinke, Emanuel, Lalanne, Philippe, Gérard, Jean-Michel, Claudon, Julien
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container_end_page 121108
container_issue 4
container_start_page 41112
container_title Applied physics letters
container_volume 106
creator Stepanov, Petr
Delga, Adrien
Zang, Xiaorun
Bleuse, Joël
Dupuy, Emmanuel
Peinke, Emanuel
Lalanne, Philippe
Gérard, Jean-Michel
Claudon, Julien
description We investigate the spontaneous emission (SE) of self-assembled InAs quantum dots (QDs) embedded in GaAs ridge waveguides that lay on a low index substrate. In thin enough waveguides, the coupling to the fundamental guided mode is vanishingly small. A pronounced anisotropy in the coupling to non-guided modes is then directly evidenced by normal-incidence photoluminescence polarization measurements. In this regime, a measurement of the QD decay rate reveals a SE inhibition by a factor up to 4. In larger wires, which ensure an optimal transverse confinement of the fundamental guided mode, the decay rate approaches the bulk value. Building on the good agreement with theoretical predictions, we infer from calculations the fraction β of SE coupled to the fundamental guided mode for some important QD excitonic complexes. For a charged exciton (isotropic in plane optical dipole), β reaches 0.61 at maximum for an on-axis QD. In the case of a purely transverse linear optical dipole, β increases up to 0.91. This optimal configuration is achievable through the selective excitation of one of the bright neutral excitons.
doi_str_mv 10.1063/1.4906921
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Anisotropy
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coupling
Decay rate
Dipoles
Emission analysis
Emissions control
EXCITONS
GALLIUM ARSENIDES
INDIUM ARSENIDES
Optics
PHOTOLUMINESCENCE
Physics
POLARIZATION
QUANTUM DOTS
Quantum theory
Self-assembly
Spontaneous emission
SUBSTRATES
WAVEGUIDES
title Quantum dot spontaneous emission control in a ridge waveguide
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