Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.36: Poster

Tuesday, March 12, 2013, 18:15–21:45, Poster B2

Simulation of antenna arrays for surface enhanced infrared spectroscopy — •Tobias W. W. Maß, Ann-Katrin U. Michel, Jon Mattis Hoffmann, and Thomas Taubner — 1st Institute of Physics, RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany

Metallic nanoantennas efficiently couple light into a region of subwavelength size. Antenna arrays designed for surface enhanced infrared spectroscopy (SEIRS) enable the detection of molecular vibration with high sensitivity [1]. Simulations are a useful tool to examine antenna coupling effects, which are crucial for plasmon resonance optimization [2]. Our simulation based investigations are concerned with square nanorod and hexagonal arranged triangle arrays having their plasmon resonances in the mid infrared region. Understanding the antenna coupling is important to predict the resonance position as well as the resonance width [3]. Therefore, analytic dipole approximations and numerical FDTD simulations are performed to explore the influence of coupling effects for different antenna lengths, array periodicities and substrate or cover material refractive indices. Experimental comparison is realized by FTIR measurements of e-beam and nanosphere lithography fabricated samples.

[1] Adato et al. PNAS 2009 106(46), 19227-19232.

[2] Libermann et al. Opt. Express 2012 20(11), 11953-11966.

[3] Adato et al. Opt. Express 2010 18(5), 4526-4537.