Institut des
NanoSciences de Paris
insp
insp
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Emission polarization analysis

 

In the perspective of coupling efficiently a nano-emitter to a photonic structure, the knowledge of the emitter orientation is necessary. It is also necessary to determine whether light emission originates from a single dipole or from an incoherent sum of two degenerate dipoles (« 2D dipole »). We have established a theoretical description which connects the orientation of an emitter and its 1D or 2D nature to its polarization behavior. We have shown that the angle between the dipole and the optical axis can be extracted from the degree of linear polarization (provided that the theoretical relation between these quantities is known (fig. 1c), by a model which must include in particular the emitter optical environment and the objective numerical aperture). We applied this method to the study of CdSe/CdS nanocrystals (2D dipoles ; synthesis B. Dubertret) (fig. 1b) and to dot-in-rod CdSe/CdS nanorods (1D dipoles ; synthesis L. Carbone), as well as nanorods oriented by a liquid crystal (collaboration E. Lacaze).

Fig. 1 : An example of orientation measurement for a CdSe/CdS nanocrystal (a) Experimental setup schematic and definition of the angles, (b) result of the experimental polarization analysis, (c) theoretical relation between the degree of linear polarization \delta and the angle \Theta. The conclusion of this measurement is that \Phi = 49° and \Theta = 51°, with 4° uncertainty on each angle value.

 

Collaborations :

- Benoît Dubertret at LPEM (ESPCI, Paris)

- Alberto Bramati at LKB (Paris)

- Luigi Carbone, NNL, Istituto Nanoscienze-CNR, (Lecce)

- Emmanuelle Lacaze, INSP

 

Communications :

- Laurent Pelliser, Mathieu Manceau, Clotilde Lethiec, Delphine Coursault, Stefano Vezzoli, Godefroy Leménager, Laurent Coolen, Massimo DeVittorio, Ferruccio Pisanello, Luigi Carbone, Agnès Maître, Alberto Bramati and Emmanuelle Lacaze, Alignment of rod-shaped single photon emitters dynamically driven by line defects in liquid crystals, Adv. Funct. Mat. 25, 1719 (2015)

- Clotilde Lethiec, Ferruccio Pisanello, Luigi Carbone, Alberto Bramati, Laurent Coolen and Agnès Maître, Polarimetry-based analysis of dipolar transitions of single colloidal CdSe/CdS dot-in-rods, New J. Phys. 16, 093014 (2014),

- C. Lethiec, J. Laverdant, C. Javaux, B. Dubertret, C. Schwob, L. Coolen and A. Maître, Determination of the orientation of a single nano-emitter by polarization analysis, Advanced Architectures in Photonics (AAP 2014), Prague (Rép. Tchèque), 21-24 septembre 2014,

- C. Lethiec, J. Laverdant, C. Javaux, B. Dubertret, C. Schwob, L. Coolen and A. Maître, Determination of the orientation of a single nano-emitter by polarization analysis, Condensed Matter in Paris (CMD25-JMC14), Paris, 24-29 août 2014,

- C. Lethiec, J. Laverdant, C. Javaux, B. Dubertret, C. Schwob, L. Coolen and A. Maître, Determination of the orientation of a single nano-emitter by polarization analysis, International Conference on Nanoscience + Technology (ICN+T), Vail (Etats-Unis), 21-25 juillet 2014,

- Clotilde Lethiec, Julien Laverdant, Henri Vallon, Clémentine Javaux, Benoît Dubertret, Jean-Marc Frigerio, Catherine Schwob, Laurent Coolen and Agnès Maître, Measurement of three-dimensional dipole orientation of a single fluorescent nanoemitter by emission polarization analysis, Phys. Rev. X 4, 021037 (2014),

- C. Lethiec, J. Laverdant, H. Vallon, L. Carbone, B. Dubertret, C. Javaux, C. Schwob, L. Coolen, A. Maître, Determination of the orientation of a single nano-emitter by polarization analysis, International Nanoscience Student Conference, (Londres, Août 2013)

- Clotilde Lethiec, Julien Laverdant, Hugo Frederich, Cherif Belacel, Catherine Schwob, Laurent Coolen, Agnès Maître, Godefroy Leménager, Alberto Bramati, Luigi Carbone, Etude en polarisation de l’orientation de différents types de nanoémetteurs, Journées de la Matière Condensée, Montpellier, août 2012