Free-space microwave focusing by a negative-index gradient lens

被引:112
作者
Driscoll, T
Basov, DN
Starr, AF
Rye, PM
Nemat-Nasser, S
Schurig, D
Smith, DR
机构
[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[2] SensorMetrix Inc, San Diego, CA 92121 USA
[3] Univ Calif San Diego, CEAM Grp, MAE Dept, La Jolla, CA 92093 USA
[4] Duke Univ, ECE Dept, Durham, NC 27708 USA
关键词
D O I
10.1063/1.2174088
中图分类号
O59 [应用物理学];
学科分类号
摘要
Metamaterial structures designed to have simultaneously negative permittivity and permeability are known as left-handed materials. Their complexity and our understanding of their properties have advanced rapidly to the point where direct applications are now viable. We present a radial gradient-index lens with an index of refraction ranging from -2.67 (edge) to -0.97 (center). Experimentally, we find that the lens can produce field intensities at the focus that are greater than that of the incident plane wave. These results are obtained at 10.3 GHz and in excellent agreement with full-wave simulations. We also demonstrate an advanced fabrication technique using conventional printed circuit board technology which offers significant design, mechanical, and cost advantages over other microwave lens constructions.
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