Dong Zheng-Gao, Liu Hui, Li Tao, Zhu Zhi-Hong, Wang Shu-Ming, Cao Jing-Xiao, Zhu Shi-Ning, Zhang X
Physics Department, Southeast University, Nanjing 211189, People's Republic of China.
Opt Express. 2008 Dec 8;16(25):20974-80. doi: 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.
我们证明，由周期性排列的双环组成的金属超材料的左旋共振传输，可以通过引入一个有源介质层作为基底，扩展到可见光谱范围。在该有源系统中，光频下金属内部严重的欧姆损耗通过受激辐射得到补偿。由于最近提出的激光表面等离激元共振放大机制，左旋传输带可以恢复到波长610nm，这取决于有源层的增益系数。此外，研究了双环单元不同缩放比例下的阈值增益，以评估不同频率范围内左旋传输恢复的增益要求。
