Weak, strong and critical coupling in intersubband polaritonics

Su invito del Prof. Giuseppe Falci, giorno 11 dicembre 2018, alle ore 10:30 in Aula C, Simone Zanotto (Istituto di Nanoscienze - CNR Pisa) terrà un seminario dal titolo Weak, strong and critical coupling in intersubband polaritonics.

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Abstract.

Weak and strong coupling concepts arise in light-matter interaction theory when dealing with emitters embedded in open optical cavities. In particular, strong coupling is closely connected to polaritons, light-matter hybrid quasiparticles whose handling became feasible thanks to semiconductor nanotechnology techniques. In parallel, the physics of open resonant cavities shows another phenomenon of significant relevance: critical coupling. In the present talk I will review these phenomena and illustrate a model that unifies them in a semiclassical way. Moreover, I will show experimental results in support of the model, relying on the intersubband polaritonics platform of GaAs/Al(Ga)As - metal - graphene nanostructures.