Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 61: Photonics II
Q 61.5: Vortrag
Freitag, 21. März 2014, 15:00–15:15, UDL HS3038
Circular polarization converters based on coupled pairs of oppositely-handed single helices — •Leonard Blume1, Johannes Kaschke1, Michael Thiel2, Lin Wu3, Zhenyu Yang3, and Martin Wegener1,2 — 1Institute of Applied Physics and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 3Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
Photonic Metamaterials based on periodic arrays of gold helices have been introduced as broadband circular polarizers. For a polarizer, low circular polarization conversions are desired. However, large conversion might also find application. Here, we introduce a new chiral architecture that achieves high conversion in transmission for one circular polarization, while keeping all other elements of the jones matrix small. One unit cell of an array consists of a pair of coupled single helices with a mutual helix axis but opposite handedness. We present a fabrication method using direct laser writing and electrochemical deposition to fabricate these broadband circular polarization converters for infrared frequencies. Furthermore, we compare optical measurements and numerical calculations.