Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts
HL 108.10: Poster
Thursday, April 3, 2014, 17:00–20:00, P1
Influence of metal layers on the optical properties of Bragg reflectors — •Merle Cornelius1, SK. Shaid-Ur Rahman1, Tim Schönfeld2, Thorsten Klein2, Carsten Kruse2, Detlef Hommel2, Jürgen Gutowski1, and Katrin Sebald1 — 1Institute of Solid State Physics, Semiconductor Optics, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany — 2Institute of Solid State Physics, Semiconductor Epitaxy, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany
Polaritons being generated in a planar microcavity structure by strong light-matter interaction can be controlled and manipulated through an additional lateral confinement applied. This can result in an increase of their relaxation probability being highly advantageous for polariton lasers. Such a confinement can be achieved by a metal grating on top of the upper distributed Bragg reflector (DBR) of the planar microcavity since in this case, Tamm plasmons, being photon modes localized at the interface, can be optically generated. Their excitation results in a change of the cavity photon energy and thus in a lateral polariton confinement. In this contribution we report on the influence of metal layers with different thicknesses on the optical properties of DBRs grown by MBE and consisting of ZnMgSSe as high-index material and a superlattice consisting of MgS/ZnCdSe as low-index material. The metal layers, being gold or silver stripes with thicknesses between 40 nm to 60 nm, were generated by lithography. By performing reflectivity measurements changes of the spectral position of the DBR oscillations as well as of the center of the stopband are analyzed.