Europhys. Lett.
Volume 69, Number 4, February 2005
Page(s) 544 - 548
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 14 January 2005
Europhys. Lett., 69 (4), pp. 544-548 (2005)
DOI: 10.1209/epl/i2004-10385-0

Experimental realization of breaking diffraction limit by planar negative-index metamaterials in free space

J.-S. Lih1, Y.-S. Wang1, M.-C. Lu1, Y.-C. Huang2, K.-H. Chen2, J.-L. Chern2, 3 and L.-E. Li4

1  Department of Physics, National Cheng Kung University - Tainan 701, Taiwan
2  Department of Photonics & Institute of Electro-Optical Engineering National Chiao Tung University - Hsinchu 300, Taiwan
3  Microelectronics and Information System Research Center National Chiao Tung University - Hsinchu 300, Taiwan
4  Agilent Technol Inc - Jhongli, Taoyuan 320, Taiwan

received 23 September 2004; accepted 10 December 2004
published online 14 January 2005

The sharpness of the image formed by a conventional lens is always limited by the wavelength of light. Recently, Pendry proposed a superlens, with a negative refractive index, such that the resolution is not limited by wavelength. Herein, we report direct experimental evidence of Pendry's superlens breaking the diffraction limit, in the microwave range of the X band (8-12 $\un{GHz}$), with a periodic array of split ring resonators and continuous wires; i.e. a meta-material with negative index of refraction.

42.79.Bh - Lenses, prisms and mirrors.
78.20.Ci - Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity).
41.20.Jb - Electromagnetic wave propagation; radiowave propagation.

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