Physics – Optics
Scientific paper
2008-12-06
Optics Express 16 (25) 20974-20980 (2008)
Physics
Optics
12 pages, 5 figures
Scientific paper
10.1364/OE.16.020974
We demonstrate that left-handed resonance transmission from metallic metamaterial, composed of periodically arranged double rings, can be extended to visible spectrum by introducing an active medium layer as the substrate. The severe ohmic loss inside metals at optical frequencies is compensated by stimulated emission of radiation in this active system. Due to the resonance amplification mechanism of recently proposed lasing spaser, the left-handed transmission band can be restored up to 610 nm wavelength, in dependence on the gain coefficient of the active layer. Additionally, threshold gains for different scaling levels of the double-ring unit are investigated to evaluate the gain requirement of left-handed transmission restoration at different frequency ranges.
Cao Jing-Xiao
Dong Zheng-Gao
Li Tiancheng
Liu Hui
Wang Shu-ming
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