Two-photon autocorrelation measurements on a single InGaN/GaN quantum dot.
We report on the use of interferometric autocorrelation measurements to investigate the non-linear absorption processes evident in single InGaN/GaN quantum dots. The near quadratic excitation intensity dependence of the photoluminescence signal in conjunction with the asymmetric collinear autocorrelation trace unambiguously confirms the process as being one involving two photons via an intermediate virtual state. These results highlight the inherently non-linear optical properties of these structures.
Collins
Daniel
D
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Jarjour
Anas
A
Hadjipanayi
Maria
M
Taylor
Robert
R
Oliver
Rachel
R
Kappers
Menno
M
Humphreys
Colin
C
Tahraoui
Abbes
A
D005708:Gallium / Q000737:chemistry* / Q000528:radiation effects; D007204:Indium / Q000737:chemistry* / Q000528:radiation effects; D036641:Microscopy, Fluorescence, Multiphoton / Q000379:methods*; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence / Q000379:methods*
D007204:Indium; C473348:gallium nitride; D005708:Gallium; C513701:indium nitride