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O: Fachverband Oberflächenphysik

O 24: Plasmonics and Nanooptics: Fabrication, Characterization and Applications

O 24.4: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Automatized Optical Switching of Phase Change Material for Mid - Infrared Resonant Structures — •Julian A. Hanss, Martin Lewin, Tobias W.W. Maß, and Thomas Taubner — Institute of Physics (IA) RWTH Aachen

Confinement and local enhancement of electric fields can be achieved by metallic resonant structures. Dimensions and optical properties of the structure and surroundings define the position and strength of the resonance. Optical or thermal switching between different metastable phases of Phase Change Materials (PCMs) with distinct optical properties provide the opportunity of reversible, post - fabrication tuning of such resonances [1]. Focused laser beams change the structural phase of the PCM on a microscale, providing the possibility to switch for example single antennas of an array or write arbitrary structured optical metasurfaces [2].
By automatizing a previously built laser setup, the efficiency of structure modulation is increased facilitating fast investigations of different structures and material combinations. Localized, reversible tuning of resonant structures and and writing of arbitrary patterns can be achieved to create predefined optical responses.

[1] A. Michel et al., Nano Lett., 13(8), pp 3470-3475 (2013)
[2] Q. Wang et al., arXiv: 1508.03818 [physics.optics]