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].
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