Loss compensated negative index material at optical wavelengths |
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| Authors: | Anan Fang Zhixiang Huang Thomas Koschny Costas M Soukoulis |
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| Institution: | 1. Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, IA 50011, USA;2. Key Laboratory of Intelligent Computing and Signal Processing, Anhui University, Hefei 230039, China;3. Department of Materials Science and Technology and Institute of Electronic Structure and Laser, FORTH, University of Crete, 71110 Heraklion, Crete, Greece |
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| Abstract: | We present a computational approach, allowing for a self-consistent treatment of three-dimensional (3D) fishnet metamaterial operating at 710 nm wavelength coupled to a gain material incorporated into the nanostructure. We show numerically that loss-free negative index material is achievable by incorporating gain material inside the fishnet structure. The effective gain coefficient of the combined fishnet-gain system is much larger than its bulk counterpart and the figure-of-merit (FOM = | Re(n)/Im(n) |) increases dramatically with gain. Transmission, reflection, and absorption data, as well as the retrieved effective parameters, are presented for the fishnet structure with and without gain. |
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