[Todos] Coloquios DF - Alejandro Yacomotti (CNRS), Jueves 20/11, 14hs, Aula Seminario, 2do piso, Pab. I

[Augusto Roncaglia]

 COLOQUIOS DEL DEPARTAMENTO DE F�SICA FCEYN - UBA


              En el Aula Seminario, 2do piso, Pab. I,

              Jueves 20/11, 14hs:

              ALEJANDRO YACOMOTTI

              Laboratoire de Photonique et de Nanostructures, CNRS

            *  Spontaneous mirror-symmetry breaking in a photonic molecule*



Multi-cavity photonic systems, known as photonic molecules (PMs), are ideal
multi-well potential building blocks for advanced quantum and nonlinear
optics. A key phenomenon arising in double well potentials is the
spontaneous breaking of the inversion symmetry, i.e. a transition from a
delocalized to two localized states in the wells, which are mirror images
of each other. Although few theoretical studies have addressed
mirror-symmetry breaking in micro and nanophotonic systems, no experimental
evidence has been reported to date.

In this talk I will show that, thanks to the potential barrier engineering
we have implemented in a PM composed of two coupled photonic crystal
nanolasers, we are able to demonstrate spontaneous mirror-symmetry breaking
through a pitchfork bifurcation. Coexistence of localized states can be
shown by switching them with short pulses. This offers exciting prospects
for the realization of ultra-compact, integrated, scalable optical
flip-flops based on spontaneous symmetry breaking. Furthermore, we predict
such transitions with few intracavity photons for future devices with
strong quantum correlations.
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