Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Plasmons, plasmonic laser, and spaser
HL 18.2: Talk
Monday, March 16, 2015, 16:00–16:15, EW 203
Influence of Tamm plasmons on the light-matter interaction in ZnSe-based microcavities — •SK. Shaid-Ur Rahman1, Merle Cornelius1, Thorsten Klein2, Carsten Kruse2, Detlef Hommel2, Jürgen Gutowski1, and Kathrin Sebald1 — 1Semiconductor Optics — 2Semiconductor Epitaxy, Institute of Solid State Physics, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany
Strong light-matter interactions in semiconductor microcavities (MCs) introduce cavity polaritons. ZnSe-based MCs are very promising to realize polariton devices at elevated temperatures due to high oscillator strengths and large excitonic binding energies. By depositing a metallic layer on the DBR, electromagnetic modes called Tamm plasmons can be formed at the semiconductor-metal interface. We will discuss the influence of Tamm plasmons on the optical properties of ZnSe-based MCs. The cold MC consists of a 12-fold bottom DBR, a λ/2 cavity and a 1.5-fold top DBR. The hot unfolded MC is built of an 18-fold bottom DBR and a λ cavity including 3 ZnSe QWs. Ag layers with thicknesses between 30 and 50 nm are deposited on the MC samples. Micro-reflectivity measurements on the cold MC covered by a 30 nm Ag layer show a shift of the cavity resonance of about 26 meV compared to the metal-free areas, due to the influence of Tamm plasmons. For the hot MC, besides the shift an anticrossing between the generated cavity resonance and QW excitons is observed in temperature dependent measurements. The observed energy shift and the anticrossing are in agreement with simulations based on the transfer-matrix method.