In this project, we will develop a new type of hybrid metal/semiconductor laser source exploiting the strong potential of optical Tamm modes. These modes, which have recently been highlighted in the optical domain, exist at the interface between a metal layer and a dielectric Bragg mirror. In our case, The Bragg mirror is containing quantum wells. These modes present many features that can be advantageously exploited both for the realization of photonic or plasmonic sources. Indeed, due to their hybrid metal/dielectric nature and to their particular dispersion relation, they should enable a coupling either to the optical modes in the light cone or directly to the plasmon mode. They also present much lower losses than conventional plasmons modes and can be controlled and laterally confined by a simple patterning of the metal layer. Finally, the metallic layer opens the way to the electrical injection of the structures for the realization of photonic or plasmonic integrated sources. From a fundamental point of view, this study is part of a general trend in plasmonics which aims to cut losses while maintaining key properties of plasmons (spatial localization, spontaneous emission enhancement, lasing). Three goals will be pursued in parallel: • The first goal is the demonstration of an electrically injected and laterally confined laser source. We will first focus on the demonstration and optimization of lasing under optical pumping in Tamm structures confined by a metallic disk. The amelioration of the optical properties of the structures associated to the confinement (quality factor, enhanced beta factor, reduction of laser threshold) will be studied experimentally but also by theoretical modeling. The design of the structures for the electrical injection will be developed in parallel. In a second step, the degree of freedom opened by the easy structuration of metals will be used to design refined geometries in order to control the polarization of the emitted light or to exploit gallery modes present in these structures. • The second goal is to form a bandgap in the Tamm dispersion relation by a periodic nano-structuration of the metallic layer only. Photonic crystal cavities will be realized in order to increase the field confinement without additional losses, control the emission direction and reduce the device size. This approach relies on a well mastered technology and induces no degradation of the active layer during the process since only the metal is patterned. Periodic Tamm structures will be modeled and characterized in order to evaluate the impact of the patterning on the emission properties of the structures, and optimize lasing in terms of threshold and emission directivity. • The third goal is to exploit the hybrid metal/dielectric nature of the Tamm modes as well as their compatibility with an electrical injection in order to develop surface plasmon sources. Two directions will be investigated: on the one hand a coupling between the Tamm and the plasmon mode via a grating on metal, and on the other hand a direct coupling between these two modes. Modeling and optical characterization will be implemented to identify and optimize the Tamm/plasmon coupling in both configurations, in order to finally exploit this coupling for the realization of plasmon sources. The realization of this project will not only lead to a better understanding of the physical effects associated with these new modes, but also pave the way both for the development of new types of laser structures whose properties could be controlled by simple technological processes, and to devices enabling the conversion of localized electrical excitation into surface plasmons.