Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Poster Session I

MM 20.11: Poster

Dienstag, 24. März 2009, 14:45–16:30, P4

Investigation of structure dependent resonances in split-ring resonators by terahertz time-domain spectroscopy — •Stefan Waselikowski, Markus Walther, and Hanspeter Helm — Department of Molecular and Optical Physics, University of Freiburg

Recently metamaterials based on split-ring resonator structures raised considerable interest due to their unprecedented electromagnetic properties [1]. Their behavior is mainly dictated by the interaction of their building blocks with an incident light wave and the associated formation of electric and magnetic resonances. We use terahertz time-domain spectroscopy (THz-TDS) [2] to measure the characteristic resonances in different arrangements of metallic split-ring resonators. By varying the resonator geometry we are able to study both, the structure-dependence of the resonances as well as coupling between individual resonators. Our approach takes advantage of the ability of THz-TDS to measure amplitude and phase of the electric field over a wide spectral bandwidth. Furthermore, due to the relatively large wavelength (1 THz corresponds to λ=300 µm) structures with dimensions on the order of the wavelength can easily be manufactured by standard micro-fabrication techniques.

[1] D. R. Smith, J. B. Pendry, and M. C. K. Wiltshire, Science 305, 788 (2004)

[2] D. Grischkowsky, S. Keiding, M. Vanexter, and C. Fattinger, J. Opt. Soc. Am. B 7, 2006 (1990)