Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 81: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)

CPP 81.3: 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.