A great deal of attention has recently been focused on a new class of smart materials—so-called left-handed media—that exhibit highly unusual electromagnetic properties and promise new device applications^{1, 2, 3, 4, 5, 6}. Left-handed materials require negative permeability , an extreme condition that has so far been achieved only for frequencies in the microwave to terahertz range^{7, 8, 9, 10, 11}. Extension of the approach described in ref. 7 to achieve the necessary high-frequency magnetic response in visible optics presents a formidable challenge^{12, 13, 14, 15}, as no material—natural or artificial—is known to exhibit any magnetism at these frequencies. Here we report a nanofabricated medium consisting of electromagnetically coupled pairs of gold dots with geometry carefully designed at a 10-nm level. The medium exhibits a strong magnetic response at visible-light frequencies, including a band with negative . The magnetism arises owing to the excitation of an antisymmetric plasmon resonance. The high-frequency permeability qualitatively reveals itself via optical impedance matching. Our results demonstrate the feasibility of engineering magnetism at visible frequencies and pave the way towards magnetic and left-handed components for visible optics.

1. Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK
2. Institute of Microelectronics Technology, 142432 Chernogolovka, Russia
3. Department of Electronic Engineering, Aston University, Aston Triangle, Birmingham B4 7ET, UK

Correspondence to: A. N. Grigorenko¹ Correspondence and requests for materials should be addressed to A.N.G. (Email: sasha@man.ac.uk).

Received 19 May 2005; Accepted 19 September 2005

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