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O: Fachverband Oberflächenphysik

O 43: Plasmonics and Nanooptics IV

O 43.10: Vortrag

Mittwoch, 13. März 2013, 12:45–13:00, H31

Antenna-enhanced infrared near-field nanospectroscopy of a polymer — •Jón Mattis Hoffmann, Benedikt Hauer, and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany

Infrared spectroscopy is a powerfull characterization tool which allows for the investigation of chemical properties of a sample by directly probing molecular vibrations. On nanometer scale this is enabled by scattering-type scanning near-field optical microscopy (s-SNOM). This technique provides information about topographical and chemical material properties with subwavelength resolution.[1]

In this work, we demonstrate that the sensitivity of s-SNOM can be improved by means of infrared resonant antennas. This is comparable to the application of resonant nanostructures in far-field surface-enhanced infrared spectroscopy (SEIRS).[2] Here, antennas prepared with colloidal lithography are used to enhance the spectra of a polymer coverlayer. We find that the near-field amplitude spectra of the polymer obtained on resonant structures are increased in absolute value as well as in contrast over those obtained on non-resonant, highly reflective materials such as gold.[3]

[1] F. Keilmann et al. in Nano-Optics and Near-Field Optical Microscopy ed. by A. Zayats and D. Richards, 235 (ArtechHouse, 2009).

[2] F. Neubrech et. al., Physical Review Letters 105, 157403 (2008).

[3] J. M. Hoffmann et. al., Applied Physics Letters 101, 193105 (2012).