讲座题目：Quantum manipulation of polaritons and hybrid nanophotonics with nanocrystals
主讲人：Prof. Alberto Bramati
主持人：武愕研究员
讲座时间：2016.12.2 上午10:00
讲座地点：理科大楼A814室各位
报告摘要：
In the first part of the talk I will describe our recent experiments on microcavity polaritons. Polaritons, the halflight-half-matter particles arising from the strong coupling between excitons and photons, behave like weakly interacting composite bosons. Due to their excitonic part they exhibit non-linear interaction while their photonic part allows creating and detecting them optically. These ingredients make polariton systems a unique platform to study quantum fluid effects in a semiconductor chip.
I show how the implementation of optical traps for polaritons allows for the realization of vortex-antivortex lattices in confined geometries and 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 same sign vortices. These results open the way to the study of Abrikosov-like physics and new vortex collective phenomena in quantum fluids of light.
In the second part of the talk I will focus on our studies on core/shell colloidal semiconductor nanocrystals as very efficient room temperature single photon emitters. In particular, asymmetric core/shell nanoparticles (dots-in rods) with a spherical CdSe core surrounded by a rod-like CdS shell, are“state of the art” blinking-free sources of polarized single photons on-demand.
I will discuss the different strategies we are pursuing to develop hybrid photonic devices by coupling single nanocrystals with photonic structures as nanofiber-based optical resonators, deep parabolic mirrors, liquid crystals and semiconductor nanowires.