Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 24: Plasmonics and Nanooptics: Fabrication, Characterization and Applications
O 24.5: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Plasmonic gradient structures: Nanorod arrays with high spectral tunability — •Matthias Böhm1, Susan Derenko1, Vera Fiehler1, Fabian Patrovsky1, Stephan Barth2, Hagen Bartzsch2, Peter Frach2, and Lukas M. Eng1 — 1Institut für Angewandte Physik, Technische Universität Dresden, 01062 Dresden, Deutschland — 2Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik Dresden (FEP), 01277 Dresden, Deutschland
Nanorod arrays are fabricated for instance by anodizing aluminum thin films with acidic solutions such as sulfuric acid or oxalic acid [1]. When altering the anodization conditions, different pore sizes and inter-pore distances are achieved, hence leading to plasmonic nanorod arrays that offer a broad range of spectral tunability when filling the pores with e.g. gold or silver. It is well known that the plasmonic resonance properties strongly depend on the aspect ratio (length-to-diameter) of individual particle antennas [2]. However, when fabricating antenna arrays, the distance between adjacent rods becomes crucial and thus needs to be controlled by the fabrication method and conditions.
Our study here presents a experimental and theoretical analysis of how the geometrical parameters must be varied in order to achieve antenna gradient structures within one sample that allows spectral tunability over several hundred nanometers in the optical wavelength range.
[1] M. Wang, Y. Liu, and H. Yang, Electrochim. Acta 62, 424 (2012).
[2] S.W. Prescott and P. Mulvaney, J. Appl. Phys. 99, 123504 (2006).