Strong influence of packing density in terahertz metamaterials

Details Strong influence of packing density in terahertz metamaterials Strong influence of packing density in terahertz metamaterials

2010-08-12

arxiv.org/abs/1008.2094v1

Physics

Optics

7 pages, 4 figures

Scientific paper

We investigate the response of terahertz metamaterials made of split-ring resonators depending on the unit cell density. It is shown that the fundamental resonance has its highest Q factor for a period of one-third the resonance wavelength. Increasing or decreasing the period from that optimal period reduces the Q factor. All observations are explained by understanding radiative coupling as the dominant loss mechanism at low densities, whereas the strong inter SRR coupling enhances non-radiative losses at high densities. Our results allow designing metamaterials with adjustable Q factors and possibly suggesting that an optimal package density exists to induce the strongest dispersion.

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