Expérimental et théorique
Hexagonal Boron Nitride (h-BN) is a 2D material that hosts colored centers emitting single photons in the visible range. h-BN has the remarkable property of displaying remarkable brightness and great photophysical properties at ambient temperature making it a good candidate for single photon emission in less constraining temperature conditions. Emission of a single photon can be achieved using a two-levels system and controlling its excitation. An important issue is to control the emission mode and the emission time. This can be achieved by controlling the environment and the excitation of the emitter. 2D nature of hBN enables to envision original strategies to achieve coupling between color centers and nanostructures for the control of single photon emission. The long term goal of the project is to demonstrate controlled positioning of emitters around nanostructures with unprecedented accuracy in order to fabricate complex structures. For instance, one could stack two emitters in close proximity to control spontaneous emission. Their mutual coupling provides a means to control in time domain the emission : this single photon emitting system with an adaptable bandwidth could be useful to build quantum memories, able to store and release quanta on demand. Metasurfaces can also be used to collect optimally the single photon flux and provide an arbitrary control of the wavefront.