We report on the efficient surface plasmon amplification by stimulated emission of radiation (spaser) from a gold nanorod coated with proper gain media. Numerical simulations show that the threshold of the nanorod- based spaser is nearly 1 order of magnitude lower than that of the core-shell nanosphere, which is verified by analysis with electrostatic theory. Furthermore, it is found that the nanorod-based nanosystem possesses unique optical properties such as wavelength tunability and polarization sensitivity.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: November 16, 2010
Revised Manuscript: February 18, 2011
Manuscript Accepted: March 11, 2011
Published: April 1, 2011
Si-Yun Liu, Jiafang Li, Fei Zhou, Lin Gan, and Zhi-Yuan Li, "Efficient surface plasmon amplification from gain-assisted gold nanorods," Opt. Lett. 36, 1296-1298 (2011)