Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Poster 2
HL 48.3: Poster
Donnerstag, 26. März 2009, 15:00–17:30, P2
Surface plasmons in terahertz metamaterials — Guillermo Acuna1, Stephan Heucke1, Florian Kuchler1, •Stefan Schloegl1, How Tong Chen2, Anton J. Taylor2, and Roland Kersting1 — 1Photonics and Optoelectronics Group & Center for NanoScience, University of Munich, 80799 Munich, Germany — 2Los Alamos National Laboratory, MPA-CINT, MS K771, Los Alamos, New Mexico 87545, USA
Many metamaterials consist of miniaturized electronic circuits, which are arranged in periodic patterns. Most commonly, the electromagnetic response of such lattices is attributed to the properties of the circuit within an individual unit cell. Examples are the resonances given by the inductances and capacitances (fundamental modes) or other modes within the unit cell such as Mie resonances. In this contribution, we will show that surface plasmons contribute to the overall response of metamaterials and in some cases even modify the fundamental response. We present an experimental study on metamaterials using terahertz near-field microscopy. The extreme subwavelength resolution of our technique provides the local properties of the individual resonances in all detail. The results show the fundamental mode as well as a resonance at higher frequency. Our study reveals that this resonance, which is commonly interpreted to be a Mie resonance, in fact results from the excitation of surface plasmons [1]. [1] G. Acuna, et al., *Surface plasmons in terahertz metamaterials*, Optics Express Vol. 16, 23, pp.18745-18751 (2008)