title: Exciton Fine Structure of CdSe/CdS Nanocrystals Determined by Polarization Microscopy at Room Temperature.
abstract: We present a method that allows determining the band-edge exciton fine structure of CdSe/CdS dot-in-rods samples based on single particle polarization measurements at room temperature. We model the measured emission polarization of such single particles considering the fine structure properties, the dielectric effect induced by the anisotropic shell, and the measurement configuration. We use this method to characterize the band-edge exciton fine structure splitting of various samples of dot-in-rods. We show that, when the diameter of the CdSe core increases, a transition from a spherical like band-edge exciton symmetry to a rod-like band edge exciton symmetry occurs. This explains the often reported large emission polarization of such particles compared to spherical CdSe/CdS emitters.
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.|Center for Disruptive Photonic Technology (CDPT), School of Physical and Mathematical Sciences (SPMS), Nanyang Technological University , 21 Nanyang Link, Singapore 637371, Singapore.
authors.forename: Stefano
authors.initials: S
authors.lastname: Vezzoli
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Manceau
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.|Laboratoire de Physique de la Matière Condensée, CNRS - Ecole Polytechnique , UMR 7643, 91128 Palaiseau, France.
authors.forename: Godefroy
authors.initials: G
authors.lastname: Leménager
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.
authors.forename: Quentin
authors.initials: Q
authors.lastname: Glorieux
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Giacobino
authors.affiliation: CNR NANOTEC-Istituto di Nanotecnologia U.O. Lecce , c/o Polo di Nanotecnologia-Campus Ecotekne, via Monteroni, 73100 Lecce, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Carbone
authors.affiliation: Istituto Italiano di Tecnologia (IIT) , Center for Bio-Molecular Nanotechnologies Via Barsanti sn, 73010 Arnesano (Lecce), Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: De Vittorio
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France , 4, Place Jussieu Case 74, F-75005 Paris, France.
authors.forename: Alberto
authors.initials: A
authors.lastname: Bramati
keywords: colloidal nanocrystals; core−shell heterostructure; exciton fine structure; photoluminescence; polarization microscopy