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High-density array of Au nanowires coupled by plasmon modes

Yan Hong-Dan, Peter Lemmens, Johannes Ahrens, Martin Bröring, Sven Burger, Winfried Daum, Gerhard Lilienkamp, Sandra Korte, Aidin Lak, Meinhard Schilling
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Publishing process
  • Received Date:  21 March 2012
  • Accepted Date:  27 June 2012
  • Published Online:  05 December 2012

High-density array of Au nanowires coupled by plasmon modes

  • 1. Institute for Condensed Matter Physics, Technische Universität Carolo-Wilhelmina, Braunschweig, Germany 38106;
  • 2. International Graduate School of Metrology, Technische Universität Carolo-Wilhelmina, Braunschweig, Germany 38106;
  • 3. Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Braunschweig, Germany 38106;
  • 4. Konrad-Zuse-Zentrum für Informationstechnik, Berlin, Germany 14195;
  • 5. Institute of Energy Research and Physical Technologies, Technische Universität Clausthal, Clausthal-Zellerfeld, Germany 38678;
  • 6. Institute of Electrical Measurement and Fundamental Electrical Engineering, Technische Universität Carolo-Wilhelmina, Braunschweig, Germany 38106
Fund Project:  Project supported by the International Graduate School of Metrology (B-IGSM) and the NTH-School Contacts in Nanosystems.

Abstract: Au nanowire arrays with high aspect ratios are prepared in anode aluminum oxide templates by electrochemical deposition. The obtained structures are investigated by scanning Auger microscopy. Surface plasmon resonances of Au nanowire arrays induce a transverse mode (T mode) and a longitudinal mode (L mode) in the optical absorption, which indicates the strong anisotropy of the Au nanowires. The L mode intensity is related to the angle and polarization of the incident light. The L mode position shows a shift with the increase of aspect ratio of the nanowires. The plasmon coupling between Au nanowires is compared with the H-aggregation of organic chromophores. The blue shift of the L mode in the arrays compared with a single nanowire is induced by multi-coupling of the electromagnetic field between neighbouring nanowires. A finite element method is used to simulate the electric field distributions of a single Au nanowire and an array of plasmonically coupled wires.

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