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Media type:
E-Article
Title:
Spontaneous emission control of single quantum dots in bottom-up nanowire waveguides
Contributor:
Bulgarini, Gabriele;
Reimer, Michael E.;
Zehender, Tilman;
Hocevar, Moïra;
Bakkers, Erik P. A. M.;
Kouwenhoven, Leo P.;
Zwiller, Valery
Published:
AIP Publishing, 2012
Published in:
Applied Physics Letters, 100 (2012) 12
Language:
English
DOI:
10.1063/1.3694935
ISSN:
0003-6951;
1077-3118
Origination:
Footnote:
Description:
Nanowire waveguides with controlled shape are promising for engineering the collection efficiency of quantum light sources. We investigate the exciton lifetime in individual InAsP quantum dots, perfectly positioned on-axis of InP nanowire waveguides. We demonstrate control over the quantum dot spontaneous emission by varying the nanowire diameter in e-beam patterned arrays, which modifies the coupling efficiency of the emitter to the fundamental waveguide mode. The spontaneous emission rate is inhibited by a factor of 12 in thin nanowires compared to nanowires with optimized waveguide diameter. From the measured inhibition factor, we determine a high radiative yield exceeding 92% in bottom-up grown nanowires.