Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 30: Plasmonics and Nanooptics III

O 30.6: Talk

Tuesday, March 12, 2013, 11:45–12:00, H31

Infrared spectroscopy of single surface phonon polariton resonators — •Tao Wang, Benedikt Hauer, Peining Li, and Thomas Taubner — 1st Institute of Physics (1A), RWTH Aachen University, 52056, Aachen, Germany

Infrared spectroscopy is widely used to identify and characterize molecules. Recently, the sensitivity of infrared absorption spectroscopy was enhanced by several orders of magnitude with metallic optical antennas on dielectric substrates [1-2]. However, phonon-resonant nanostructures promise an even higher field enhancement compared to infrared metallic antennas [3].

In this work, we experimentally investigate the infrared spectroscopy of single surface phonon polariton (SPhP) resonators. The SPhP resonators are individual micro-size holes in a thin gold film fabricated by nanosphere lithography, which is deposited on a SiC substrate. The SPhP resonance of the single holes can be clearly seen from far-field extinction spectra and from near-field optical images. The strong field enhancement combined with the easy fabrication makes single SPhP resonators as a promising candidate for highly sensitive surface enhanced infrared absorption spectroscopy.

[1] R. Adato et al.; PNAS, 106, 19227 (2009)

[2] F. Neubrech et al.; PRL 101, 157403 (2008)

[3] R. Hillenbrand et al., Nature, 418, 159-162 (2002)