Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
O 76.3: Talk
Wednesday, March 18, 2020, 16:00–16:15, WIL A317
Tunable Heterostructure Polaritonic Cavity — •Mohsen Janipour1, Matthias Hensen2, and Walter Pfeiffer3 — 1Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, Bielefeld 33615, Germany — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, Bielefeld 33615, Germany
Realizing and designing of tunable cavities at the infrared frequencies is crucial for achieving novel integrated photonic circuits. In the infrared regime, semiconductors like GaAs can support the excitation of surface phonon polaritons in the Reststrahlen band with the ability to tune through carrier concentration. In this study, we explore a novel heterostructure cavity composed of a hollow circular hole drilled in an Ag film which is stacked on a GaAs substrate. We show that this cavity can support two types of resonant modes consisting of circular cavity resonant modes and the surface modes due to the excitation of polaritonic modes in the Reststrahlen band. We indicate that the polaritonic modes can be tuned through controlling the distribution of the substrate*s carriers in the Reststrahlen band.