Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 11: Plasmonics and Nanooptics I
O 11.3: Talk
Monday, March 14, 2011, 15:30–15:45, PHY C213
Metallic nanorod arrays: negative refraction and optical properties explained by retarded dipolar interactions — •René Kullock1, Stefan Grafström1, Paul R. Evans2, Robert J. Pollard2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden, Germany — 2Centre for Nanostructured Media, IRCEP, The Queen’s University of Belfast, Belfast BT7 1NN, UK
Two-dimensional (2D) arrays of metallic nanorods arranged perpendicular to a substrate exhibit novel optical features: a short-axis resonance, and several long-axis surface plasmon resonances (LSPRs) which appear for excitation with p-polarized light at specific angles of incidence [1]. Especially the first LSPR mode is very sensitive to both geometry and environment. In order to make it accessible for different applications, a fundamental physical understanding is indispensable.
Here, we theoretically treat such a 2D nanorod array by applying the retarded dipolar interaction model (DIM). First, we nicely follow the LSPR changes when extending our calculations from the single nanorod to a 2D array of nanorods [2]. Then, using the DIM model we are able to explain how the LSPR depends on several physically relevant parameters, such as the nanorod length, diameter, neighboring distance, material, and surroundings. Furthermore, the DIM also delivers conditions under which negative and extraordinary positive refraction in such metallic nanorod arrays will occur.
[1] R. Kullock et al., Opt. Express 16, 21671 (2008)
[2] R. Kullock et al., J. Opt. Soc. Am. B 27, 1819 (2010).