Experimental realization of highly efficient broadband coupling of single quantum dots to a photonic crystal waveguide.
We present time-resolved spontaneous emission measurements of single quantum dots embedded in photonic crystal waveguides. Quantum dots that couple to a photonic crystal waveguide are found to decay up to 27 times faster than uncoupled quantum dots. From these measurements beta-factors of up to 0.89 are derived, and an unprecedented large bandwidth of 20 nm is demonstrated. This shows the promising potential of photonic crystal waveguides for efficient single-photon sources. The scaled frequency range over which the enhancement is observed is in excellent agreement with recent theoretical proposals taking into account that the light-matter coupling is strongly enhanced due to the significant slow-down of light in the photonic crystal waveguides.
DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, DK-2800 Kgs. Lyngby, Denmark. tolh@fotonik.dtu.dk
T
T
Lund-Hansen
S
S
Stobbe
B
B
Julsgaard
H
H
Thyrrestrup
T
T
Sünner
M
M
Kamp
A
A
Forchel
P
P
Lodahl