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Advances in OptoElectronics
Volume 2012, Article ID 347875, 5 pages
Research Article

Conditions of Perfect Imaging in Negative Refraction Materials with Gain

1State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China
2Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, 69978 Tel Aviv, Israel
3Chemical Physics Department, Weizmann Institute of Science, 76100 Rehovot, Israel

Received 29 June 2012; Accepted 3 October 2012

Academic Editor: Alexandra E. Boltasseva

Copyright © 2012 Haowen Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Light propagation is analyzed in a negative refraction material (NRM) with gain achieved by pumping. An inherent spatial “walk-off” between the directions of phase propagation and energy transfer is known to exist in lossy NRMs. Here, the analysis is extended to the case where the NRM acts as an active material under various pumping conditions. It is shown that the condition for perfect imaging is only possible for specific wavelengths under special excitation conditions. Under excessive gain, the optical imaging can no longer be perfect.