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接近场的板块:亚衍射聚焦与有图案的表面.

Anthony Grbic1, Lei Jiang, Roberto Merlin

  • 1Radiation Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109-2122, USA. agrbic@umich.edu

Science (New York, N.Y.)
|April 29, 2008
PubMed
概括

研究人员使用有图案的板块来控制近距离电磁场,实现了超出1千兆赫的衍射极限的聚焦. 这项技术使得用于天线和显微镜的应用中,可实现亚波长聚焦.

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科学领域:

  • 电磁主义 电磁主义
  • 超材料是指一种超材料.
  • 微波光学 微波光学 微波光学

背景情况:

  • 控制电磁近距离场对于低波长聚焦至关重要.
  • 衍射极限传统上限制了电磁波的分辨率.

研究的目的:

  • 通过使用一种新的近场板来证明超出衍射极限的电磁波聚焦.
  • 调查电容超材料在先进光束操纵方面的潜力.

主要方法:

  • 设计和制造一个有图案的,格子状板,仅由电容元件组成.
  • 利用该板来控制大约1千兆赫兹的微波的电磁近场.
  • 测量了来自圆柱形源的聚焦点大小.

主要成果:

  • 实现了微波的聚焦到大约lambda/20 (半功率光束宽度) 的点大小,明显超过了衍射极限.
  • 通过电容板结构证明了对电磁近场的有效控制.
  • 验证了微波在1千兆赫兹左右的聚焦能力.

结论:

  • 开发的近场板有效地克服了微波聚焦的衍射极限.
  • 容量超材料为先进的电磁场控制提供了一个有前途的途径.
  • 潜在的应用包括天线,光束造型,无线电力传输,显微镜和光刻.

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