Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics IV: Fabrication and Applications
O 46.4: Vortrag
Mittwoch, 20. März 2024, 11:15–11:30, MA 042
Towards a Dynamic and Switchable All-Optical Image Processing Device — •Dominik Ludescher1, Lukas Wesemann2, Lincoln Clark2, Mario Hentschel1, Ann Roberts2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2School of Physics, the University of Melbourne, Melbourne, VIC 3010, Australia
The urge for all-optical image filtering without the need for postprocessing is increasing with the requirement for fast operation, reliability, and robustness. This study unveils a fascinating new approach towards switchable image filtering devices drawing inspiration from the concept of a Salisbury screen. This novel method paves the way to real-time dynamic image processing holding immense potential in various fields of applications such as microscopy, facial recognition, or biological imaging. The general concept is based on the possibility of altering the properties of a conducting polymer by driving its inherent electrochemical redox reaction. By simply changing the applied voltage, the material properties such as the refractive index can be adapted. This change in the refractive index can be directly utilized to adapt the functionality of devices such as an optical filter. Besides turning the operation of a system fully on and off, a gradual change of the refractive index can be used to continuously vary the performance of the image processing device. Combining this approach with the concept of Fourier filtering certain spatial frequencies known from static approaches such as the Salisbury screen generates the possibility of working our way towards devices with adaptive properties.
Keywords: Switchable Metasurfaces; Dynamic Image Filtering; Switchable Salisbury Screen; Conducting Polymer; PEDOT:PSS