Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 68: Metal-Semiconductor Hybrids
HL 68.3: Vortrag
Donnerstag, 10. März 2016, 10:15–10:30, H10
Strong light-matter interaction between Tamm plasmons and exciton-polaritons in ZnSe-based microcavities — •SK. Shaid-Ur Rahman1, Thorsten Klein2, Sebastian Klembt2, Detlef Hommel2, Jürgen Gutowski1, and Kathrin Sebald1 — 1Semiconductor Optics — 2Semiconductor Epitaxy, Institute of Solid State Physics, University of Bremen, Bremen, Germany
Cavity polaritons are half-light-half-matter quasi-particles, resulting from strong coupling between quantum well (QW) excitons and cavity photons. One can modulate the polariton eigenenergies by utilizing Tamm plasmons (TPs) which are formed, e.g., at the interface between a metal and the distributed Bragg reflector (DBR) of a microcavity (MC). We will discuss the influence of TPs on the optical properties of ZnSe-based MCs. The MC consists of a 12-fold top DBR, a λ cavity including 3 ZnSe QWs, and a 18-fold bottom DBR. A layer of 40 nm Ag is deposited on top of the MC sample. Anti-crossing between the TP and the cavity mode has been observed in the micro-reflectivity measurements performed for different top layer thicknesses at RT. This built hybrid state possesses a splitting energy of about 40 meV. Measurements at 4K show four resonances due to the hybrid states of Tamm plasmons, heavy-hole, and light-hole exciton-polaritons. On resonance between the TP and the cavity mode the lowest hybrid eigenenergy is about 9 meV red-shifted from the spectral position of the lower polariton energy in the Ag layer free sample. All experimental observations are in good agreement with calculations based on the transfer-matrix method as well as on the coupled-oscillator model.