title: Two-photon autocorrelation measurements on a single InGaN/GaN quantum dot.
abstract: 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.
authors.affiliation: Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
authors.forename: Daniel
authors.initials: D
authors.lastname: Collins
authors.forename: Anas
authors.initials: A
authors.lastname: Jarjour
authors.forename: Maria
authors.initials: M
authors.lastname: Hadjipanayi
authors.forename: Robert
authors.initials: R
authors.lastname: Taylor
authors.forename: Rachel
authors.initials: R
authors.lastname: Oliver
authors.forename: Menno
authors.initials: M
authors.lastname: Kappers
authors.forename: Colin
authors.initials: C
authors.lastname: Humphreys
authors.forename: Abbes
authors.initials: A
authors.lastname: Tahraoui
mesh_terms: 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*
chemical_list: D007204:Indium; C473348:gallium nitride; D005708:Gallium; C513701:indium nitride