Optical Tamm states are electromagnétic modes confined at the interface between a Bragg mirror and a metallic film. By depositing a metallic disk on a Bragg mirror, one can confine a Tamm mode in three dimensions (fig. 1a). We studied the coupling of such a cavity to an ensemble of nanocrystals at room temperature. The measured dispersion relation (fig. 1b) corresponds to the Tamm modes, indicating a good coupling of the nanocrystals to the cavity. As the disk diameter is decreased, the effect of lateral confinement is evidenced (single discrete state below 4 µm, shift to higher energy at 2 µm). We have studied the radiation properties of these structures by combining spatial and angular resolution.

Fig. 1 : (a) Schematic of an optical Tamm cavity. (b) Measured dispersion relations for disks of different diameters.

Collaborations :

 Benoît Dubertret at the LPEM (ESPCI, Paris)

 Pascale Senellart at the LPN

 Joël Bellessa and Clémentine Symonds at the ILM

Communications :

 Fu Feng, Katia Ouaret, Simone Luca Portalupi, Xavier Lafosse, Michel Nasilowski, Willy Daney de Marcillac, Jean-Marc Frigerio, Catherine Schwob, Benoît Dubertret, Agnès Maître, Pascale Senellart et Laurent Coolen, Confined visible optical Tamm states, Journal of Electronic Materials DOI : 10.1007/s11664-015-4213-7

 Fu Feng, S. Portalupi, X. Lafosse, A. Raj Dhawan, W. Daney de Marcillac, J.-M. Frigerio, C. Schwob, B. Dubertret, A. Maître, P. Senellart and L. Coolen, Coupling coloidal nanocrystals to optical Tamm plasmons, 17th International Conference on Transparent Optical Networks ICTON 15, Budapest (Hungary), 5-9 july 2015.