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Proceedings Paper

Observation of negative refraction and negative phase velocity in true left-handed metamaterials
Author(s): Ekmel Ozbay
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Paper Abstract

We report a true left-handed (LH) behavior in a composite metamaterial consisting of periodically arranged split ring resonator (SRR) and wire structures. The magnetic resonance of the SRR structure is demonstrated by comparing the transmission spectra of SRRs with that of closed SRRs. We confirmed experimentally that the effective plasma frequency of the LH material composed of SRRs and wires is lower than the plasma frequency of the wires. A well-defined left-handed transmission band with a peak value of -1.2 dB (−0.3 dB/cm) is obtained. We also report the transmission characteristics of a 2D composite metamaterial (CMM) structure in free space. At the frequencies where left-handed transmission takes place, we experimentally confirmed that the CMM structure has effective negative refractive index. Phase shift between consecutive numbers of layers of CMM is measured and phase velocity is shown to be negative at the relevant frequency range. Refractive index values obtained from the refraction experiments and the phase measurements are in good agreement. The experimental results agree extremely well with the theoretical calculations.

Paper Details

Date Published: 27 September 2005
PDF: 9 pages
Proc. SPIE 5955, Metamaterials, 595502 (27 September 2005); doi: 10.1117/12.620264
Show Author Affiliations
Ekmel Ozbay, Bilkent Univ. (Turkey)

Published in SPIE Proceedings Vol. 5955:
Tomasz Szoplik; Ekmel Özbay; Costas M. Soukoulis; Nikolay I. Zheludev, Editor(s)

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