Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Plasmonics I (joint session O/CPP)
CPP 22.2: Vortrag
Dienstag, 2. April 2019, 10:45–11:00, H8
Advanced optical programming of individual meta-atoms beyond the effective medium approach — •Andreas F. Hessler1, Ann-Katrin U. Michel1, Sebastian Meyer1,2, Julian Pries1, Yuan Yu1, Martin Lewin1, Tobias W. W. Maß1, Matthias Wuttig1, Dmitry N. Chigrin1,2, and Thomas Taubner1 — 1Institute of Physics (IA), RWTH Aachen — 2DWI - Leibniz Institute for Interactive Materials, Aachen
Despite their nanometer thickness, active metasurfaces (MSs) based on phase-change materials (PCMs) enable compact photonic components, offering adjustable functionality for the manipulation of light, such as polarization filtering, lensing and beam steering[1]. Commonly, they feature multiple operation states by switching the whole PCM fully between two states of drastically different optical properties[2]. Intermediate states of the PCM have also been exploited to obtain gradual resonance shifts which are usually uniform over the whole MS and described by effective medium theory. We now demonstrate simultaneous control of size, position and crystallization depth of the switched PCM volume within each meta-atom. By modifying the local optical properties, reflection amplitude and phase can be programmed at the meta-atom scale. This goes beyond previous effective medium concepts and should allow for multiple complex functionalities on the same MS or small adaptive corrections to external aberrations and fabrication errors.
[1] X. Yin et al., Light Sci Appl. 6, e17016 (2017).
[2] M. Wuttig et al., Nat. Photon. 11, 465 (2017).