Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Plasmonics and nanooptics: Fabrication and characterization
O 4.7: Vortrag
Montag, 12. März 2018, 12:00–12:15, MA 041
Optimizing Plasmonic Nanorod Antenna-Arrays — •Tino Uhlig1, Fabian Patrovsky1, Vera Fiehler1, Matthias Böhm1, Susan Derenko1, Stephan Barth2, Hagen Bartzsch2, Peter Frach2, and Lukas M. Eng1 — 1Institute of Applied Physics, TU Dresden, Germany — 2Fraunhofer FEP, Dresden, Germany
Gold nanorod antenna arrays provide a strong plasmonic field enhancement and a broad spectral tunability, as needed, for example, for label-free biosensing, surface-enhanced Raman spectroscopy, or optical filter design. However, key issues in utilizing these features, are a reliable fabrication of mostly defect-free nanostructure arrays, as well as a thorough understanding and controlled tuning of the associated optical phenomena. In our work here, we extensively study the plasmonic system based on nanorod arrays, as manufactured by electrochemical pore filling of anodized aluminum oxide (AAO) templates. We present a process that greatly improves anodization of sputtered aluminum thin films, hence dramatically reducing the defect density of such nanorod arrays [1]. The improved homogeneity of our samples is the prerequisite for the clear identification and the detailed analysis of the plasmonic features [2]. Lastly, we introduce an elegant method how to transfer these optimized nanorod arrays from the rigid glass substrate onto an elastically bendable, optically transparent polymer film for mechanically tuning the plasmon resonances over a broad range [3].
[1] F. Patrovsky et al., Mater. Res. Express 4, 055010 (2017).
[2] V. Fiehler et al., J. Phys. Chem. C 120, 12178 (2016).
[3] M. Böhm et al., Opt. Mater. Express 7, 1882 (2017).