Experimental realization of breaking diffraction limit by planar negative-index metamaterials in free spaceJ.-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 ), 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.
© EDP Sciences 2005