Resonance amplification of left-handed transmission at optical frequencies by stimulated emission of radiation in active metamaterials.
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.
Dong
Zheng-Gao
ZG
Physics Department, Southeast University, Nanjing 211189, People's Republic of China.
Liu
Hui
H
Li
Tao
T
Zhu
Zhi-Hong
ZH
Wang
Shu-Ming
SM
Cao
Jing-Xiao
JX
Zhu
Shi-Ning
SN
Zhang
X
X
D003198:Computer Simulation; D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055096:Optical Devices; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*