Coherently-driven exciton polaritons and cavity - QED effects in a coupled quantum dot-micropillar system

TYPESpecial Seminar - Solid State Institute, Technion
Speaker:Dr. Caspar Hopfmann
Affiliation:Institute of Solid State Physics, Technische Universitat Berling, Germany
Time:11:30 - 12:30
Location:Lidow Asher Peres (502)
Remark:Host: Professor David Gershoni
Abstract: Abstract

Cavity quantum electrodynamics (c-QED) systems have attracted extensive research interest in the past decades as the main driving force of quantum optics. Corresponding milestone experiments paved the way towards the realization of a wide variety of non-classical light sources bringing the concept of photonic quantum networks to a practical level. In view of future applications in the quantum information technology, the solid state platform of microcavities with embedded quantum emitters is very attractive as it promises low-cost mass production as well as interoperability with the integrated electronic circuit technology of today. The presented work includes studies of the quantum dots (QD)-micropillar system in both the weak and strong coupling regime using coherent and incoherent excitation. For this purpose an advanced 90° excitation and detection scheme, suitable for efficient wavelength-independent driving of the coupled exciton and cavity mode system, was implemented. This flexible and powerful technique enables access to the three-dimensional emission characteristics of QD-micropillars providing new insight into single exciton – cavity QED effects. One primary result is the observation and description of the transformation of the Jaynes-Cummings into the Autler-Townes ladder under coherent excitation of a polariton through the matter component.