Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.187402
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Funding
- U.S. Department of Energy (Basic Energy Science, Division of Materials Sciences and Engineering) [DE-ACD2-07CH11358]
- European Community FET [213390]
- Sandia National Laboratories
- National Natural Science Foundation of China [60931002, 61101064]
- Distinguished Natural Science Foundation [1108085J01]
- Universities Natural Science Foundation of Anhui Province [KJ2011A002]
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We establish a new approach for pump-probe simulations of metallic metamaterials coupled to the gain materials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, we have studied light amplification of arrays of metallic split-ring resonators with a gain layer underneath. We find that the differential transmittance Delta T/T can be negative for split-ring resonators on the top of the gain substrate, which is not expected, and Delta T/T is positive for the gain substrate alone. These simulations agree with pump-probe experiments and can help to design new experiments to compensate for the losses of metamaterials.
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