Asymmetric planar terahertz metamaterials

Singh, Ramjan; Koch, Martin; Zhang, Weili

doi:10.1364/OE.18.013044

Asymmetric planar terahertz metamaterials

Journal Article · Thu Dec 31 23:00:00 EST 2009

DOI:https://doi.org/10.1364/OE.18.013044· OSTI ID:1003805

Singh, Ramjan ^[1]; Koch, Martin ^[2]; Zhang, Weili ^[3]

Los Alamos National Laboratory
PHILIPPS UNIV
OKLAHOMA STATE UNIV

Using terahertz time-domain spectroscopy, we report an experimental observation of three distinct resonances in split ring resonators (SRRs) for both vertical and horizontal electric field polarizations at normal incidence. Breaking the symmetry in SRRs by gradually displacing the capacitive gap from the centre towards the comer of the ring allows for an 85% modulation of the fundamental inductive-capacitive (LC) resonance. Increasing asymmetry leads to the evolution of an otherwise inaccessible high quality factor electric quadrupole resonance that can be exploited for bio-sensing applications in the terahertz region.

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Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: DOE

DOE Contract Number:: AC52-06NA25396

OSTI ID:: 1003805

Report Number(s):: LA-UR-10-02169; LA-UR-10-2169

Country of Publication:: United States

Language:: English

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