Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 53: Optical Properties I
HL 53.3: Vortrag
Mittwoch, 16. März 2011, 13:00–13:15, POT 251
THz studies of strong-coupling microcavity systems — •Andrea C Klettke1, Johannes T Steiner1, Mackillo Kira1, Stephan W Koch1, and Yun-Shik Lee2 — 1Department of Physics and Material Sciences Center, Philipps-University Marburg, Renthof 5, D-35032 Marburg, Germany — 2Department of Physics, Oregon State University, Corvallis, Oregon 97331, USA
We study semiconductor quantum wells inside a cavity assuming the simultaneous presence of optical and terahertz radiation. Light-matter coupling of semiconductor quantum wells inside Bragg-mirror microcavities leads in the linear regime to a polaritonic mixing of the excitonic quantum well resonance and the cavity mode. The resulting normal mode splitting into low (LEP) and high energy peak (HEP) provides a basis for the conversion of 1s → 2p population via strong THz radiation.
We present a microscopic theory allowing us to quantitatively evaluate the combined influence of the optical and THz field and their interaction with the microcavity exciton resonance. We use the parameters appropriate to study the response of a system investigated experimentally in the group at Oregon State University.
The major observation is that we can selectively switch off either the low or the high energy peak. Non-linear contributions will be discussed as well as multi-photon absorption and higher harmonics.