Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Nano-Optics (Microscopy and Plasmonics)
Q 7.7: Vortrag
Montag, 9. März 2020, 15:45–16:00, a310
Development of 3D Metallic Microstructures for Light Concentration — •Lei Zheng1,2 and Bernhard Roth1,2 — 1Hannover Centre for Optical Technologies, Leibniz Universität Hannover, Nienburger Straße 17, 30167 Hannover, Germany — 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Displine), Hannover, Germany
3D metallic Microstructures with symmetrically curved surfaces are developed for surface plasmon polariton (SPP) deflection and concentration with the perspective to be employed for future sensing applications. The designed structures were first fabricated on a glass substrate using two-photon polymerization (2PP), and then covered with a 60 nm thick gold film by sputtering. Surface plasmon polaritons (SPPs) propagating on the fabricated structure are generated through a straight line on the structure surface. Leakage radiation microscopy (LRM) is used here for the excitation and observation of SPPs. When focusing the laser beam onto the straight excitation line, SPPs can be excited towards both sides of the line. The characterization results on different structures have shown that SPPs can be deflected and partly concentrated when they propagate around the raised part of the metallic structure. The maximum electromagnetic energy concentration can be reached when SPPs propagate towards the center of the raised part of the structure. An investigation on the energy concentration performance of the proposed metallic structures with respect to different structure profiles is analytically and experimentally carried out. The work towards realization of novel optical sensing devices is discussed.