Abstract

A left-handed material, a discrete fishnet array confined in a metal waveguide, is reported in our work. Our simulation results show the negative refraction occurring at visible wavelengths. The maximum of a $\mathrm{FOM}=-\mathrm{Re}\left(n\right)∕\mathrm{Im}\left(n\right)$ reaches 0.9 near the wavelength of $640\mathrm{nm}$. For another set of dimensions of the unit cell, the maximum of a FOM equals 1.07 near the $655\mathrm{nm}$ wavelength. It is indicated that this approach is greatly effective for the realization of negative refraction at visible wavelengths. Moreover, the mechanism of resonance as well as the effective inductor-capacitor (LC) circuit model is investigated.

© 2008 Optical Society of America

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