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O: Fachverband Oberflächenphysik

O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects

O 33.3: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

A tuneable photochromic lens for the visible — •Till Leuteritz and Stefan Linden — Universität Bonn, Deutschland

Tuneable metasurfaces have attracted considerable attention in recent time. In order to modify their optical properties, different approaches like dynamic carrier doping, phase change materials, mechanical deformation and electrical tuning by capacitances have been used and different tunable devices like microwave metalenses and light controllable reflections have been demonstrated [1]. In our work, we employ the photochromic material XDTE for optical switching. Under incident of uv or red light it undertakes a ring-closing or opening transition of a carbon ring, respectively. This leads to a change of refractive index, which is used to shift the plasmonic resonance of V-shaped nanoslot antennas. Thus the phase of the emitted light of each antenna can be tuned and hence the focal length of the lens.
XDTE has the advantages, that it can be easily spin coated on a sample during fabrication and that it can undergo a large number of cycling transitions without degradation.

[1] He, Qiong, et al., AAAS Research Volume 2019, Article ID 1849272