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SPASER Properties of Active Silver Elliptical Nanotubes(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2016年02期
Page:
66-
Research Field:
材料工程
Publishing date:

Info

Title:
SPASER Properties of Active Silver Elliptical Nanotubes
Author(s):
Yu Haiqun; Wu Dajian
Faculty of Science，Jiangsu University，Zhenjiang 212013，China
Keywords:
SPASER; silver nanotube; gain media; finite element method
PACS:
O539
DOI:
10.3969/j.issn.1672-1292.2016.02.011
Abstract:
SPASER（Surface plasmon amplification by stimulated emission of radiation）properties of active silver elliptical nanotubes have been investigated by using the finite element method. When the angle θ between the excitation polarization and the long-axis of the ellipse is fixed at 0°，as the gain coefficient k increases to 0.281 8，a super-resonance can be observed at the wavelength of 639.3 nm in the active elliptical silver nanotube. Meanwhile，the maximal enhancement factor of surface enhanced Raman scattering can reach about 2.56×1018，which is high enough for the single molecule detection. As θ=90°，another super-resonance can be found in the active elliptical silver nanotube at the wavelength of 742.3 nm when the gain coefficient increases to 0.081 7. With decreasing the shell thickness，the gain threshold of the super-resonance of the silver elliptical nanotube with θ=0° decreases while the gain threshold increases for θ=90°. We have further found that when θ=45°，the two super-resonances can be observed in the active elliptical silver nanotube at two critical wavelengths with increasing the gain coefficient.

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Last Update: 2016-06-30