Abstract

The design principle of split-ring resonators (SRRs) for realizing negative magnetic metamaterial is proposed through theoretical investigation of magnetic properties of SRRs from terahertz (THz) to the visible light region. To describe the frequency dispersion of metal throughout the frequency range, we consider the exact expression of the internal impedance formula. Our results indicate that the design principle should be changed completely at the transition frequency of 100THz. Below 100THz, since the resistance of the SRRs determines the magnetic responses, low-resistance structures are essential. On the other hand, we should design the SRRs’ structures maintaining large geometrical inductance above the 100THz region, because the decrease of the geometrical inductance dominantly reduces the magnetic responses.

© 2007 Optical Society of America

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