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Seminário do grupo de Óptica e Informação Quântica

Data: Sexta-Feira 24/05/2019, Sala A5-01, 11 am.

Palestrante: A. Bramati (Laboratoire Kastler Brossel, UPMC-Sorbonne 
Universités)

Title: Quantum fluids of light and nano-photonics at LKB

Abstract: In this talk I will present an overview of the recent 
experiments performed in our group.
The first part of the talk will be devoted to the so called quantum 
fluids of light [1], a wide family of systems where
an effective photon-photon interaction can be engineered, resulting in a 
hydrodynamical-like behavior. In particular
I will focus on microcavity polaritons and atomic vapors. In polaritons, 
I will show how the development of flexible
all-optical methods to inject a controlled orbital angular momentum in 
such systems results in the observation of
patterns of quantized vortices [2, 3]. These results open the way to the 
study of Abrikosov-like physics and new
vortex collective phenomena. In Rubidium atomic vapors, I will present 
very recent experiments demonstrating the
superfluid behavior in these media.
The second part of the talk will be devoted to our recent results on 
efficient room temperature single photon
emitters based on core/shell colloidal semiconductor nanocrystals. By 
using asymmetric core/shell nanoparticles
(dots-in-rods), blinking effects, multi-excitonic emission and 
polarization of the emitted photons can be
simultaneously controlled by tuning the shell dimensions [4] allowing to 
achieve “state of the art” blinking-free
sources of polarized single photons on-demand. Finally, I will discuss 
the different strategies we are pursuing to
develop hybrid photonic devices by coupling single nanocrystals with 
various photonic structures like optical
nanofibers, deep parabolic mirrors [5], liquid crystals [6] and 
semiconductor nanowires [7].