Experimental Verification of a Negative Index of Refraction

American Association for the Advancement of Science (AAAS) - Tập 292 Số 5514 - Trang 77-79 - 2001
Richard A. Shelby1, David R. Smith1, S. Schultz1
1Department of Physics, University of California, San Diego, La Jolla, CA 92093–0350, USA.

Tóm tắt

We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction ( n ) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips of standard circuit board material. By measuring the scattering angle of the transmitted beam through a prism fabricated from this material, we determine the effective n , appropriate to Snell's law. These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root of ɛ ·μ for the frequencies where both the permittivity ( ɛ ) and the permeability (μ) are negative. Configurations of geometrical optical designs are now possible that could not be realized by positive index materials.

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Tài liệu tham khảo

10.1070/PU1968v010n04ABEH003699

10.1103/PhysRevLett.85.3966

10.1103/PhysRevLett.84.4184

10.1063/1.1343489

10.1109/22.798002

10.1103/PhysRevLett.76.4773

10.1103/PhysRevLett.85.2933

R. A. Shelby D. R. Smith S. Schultz data not shown.

L. D. Landau E. M. Lifshitz L. P. Pitaevskii Electrodynamics of Continuous Media (Butterworth-Heinenann Oxford UK ed. 2 1984) p. 287.

10.1103/PhysRevB.62.10696

10.1364/JOSAA.17.001012

We thank R. Greegor and C. Parazzoli from Boeing for helpful discussions. This research was supported by the Defense Advanced Research Projects Agency (DARPA) (contract DAAD19-00-1-0525) by DARPA through a grant from the Office of Naval Research (contract N00014-00-1-0632) and by the Air Force Office of Science Research (grant F49620-00-1-0380).

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American Association for the Advancement of Science (AAAS)

Tập 292 Số 5514

77-79

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