Tunable Negative Refraction without Absorption via Electromagnetically Induced Chirality. Kästel, J., Fleischhauer, M., Yelin, S. F., & Walsworth, R. L. Physical Review Letters, 99(7):073602, August, 2007.
Tunable Negative Refraction without Absorption via Electromagnetically Induced Chirality [link]Link  Tunable Negative Refraction without Absorption via Electromagnetically Induced Chirality [pdf]Pdf  doi  bibtex   2 downloads  

Downloads: 2