Observation of negative refraction and negative phase velocity in true left-handed metamaterials

Date
2005
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Source Title
Proceedings of SPIE, Metamaterials
Print ISSN
0277-786X
Electronic ISSN
Publisher
SPIE
Volume
5955
Issue
Pages
595502-1 - 595502-9
Language
English
Type
Conference Paper
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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.

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Keywords
Left-handed medium, Metamaterial, Negative phase velocity, Negative refraction, Split ring resonator, Composite structures, Light velocity, Optical resonators, Refractive index, Left-handed medium, Metamaterial, Negative phase velocity, Negative refraction, Split ring resonators, Materials
Citation
Published Version (Please cite this version)