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In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles involved in the nanoplatelet emission. It is shown that for rectangular nanoplatelets, the emission is polarized and the emission patterns are anisotropic, whereas they remain nonpolarized and isotropic for square nanoplatelets. This can be appropriately described by the dielectric antenna effect induced by the elongated shape of the rectangular platelet.

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Publication history

Received: 28 June 2017
Revised: 15 November 2017
Accepted: 19 November 2017
Published: 02 August 2018
Issue date: July 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Acknowledgements

Acknowledgements

This work was supported by the Agence Nationale de la Recherche (project JCJC 12-JS04-0011-01 PONIMI), the Centre de Compétence Nanosciences Ile-de-France (Patch project) and by the CNRS program Platon (PICS 6456). Among their co-workers at INSP, the authors would like to thank Catherine Schwob and Jean-Marc Frigerio for fruitful discussions, Willy Daney de Marcillac for his help on the microscopy setup, Francis Breton for the setup interface and Loïc Becerra and Mélanie Escudier for the substrate preparation.

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Email: nanores@tup.tsinghua.edu.cn

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