skip to main content

SciTech ConnectSciTech Connect

Title: Efficient surface plasmon amplification in gain-assisted silver nanotubes and associated dimers

SPASER (surface plasmon amplification by stimulated emission of radiation) properties in active SiO{sub 2}–Ag nanotubes and associated dimers have been investigated by using the scattering theory and the finite element method. In the active Ag nanotube, as the gain coefficient of the core increases to a critical value, a super-resonance occurs. The SPASER phenomenon also can be found in the active Ag nanotube dimer. The strong couplings between two nanotubes lead to larger gain threshold for the active Ag nanotube dimer compared with the active Ag nanotube. At the super-resonance, the maximal surface enhanced Raman scattering factor at the “hot spot” in the active Ag nanotube dimer can achieve about 8 × 10{sup 18}, which is large enough for single molecule detection. Furthermore, with increasing the separation between two Ag nanotubes, the gain threshold value for the super-resonance of the active Ag nanotube dimer decreases, while the corresponding super-resonance wavelength increases first and then decreases.
Authors:
;  [1] ;  [2]
  1. Faculty of Science, Jiangsu University, Zhenjiang 212013 (China)
  2. Jiangsu Key Lab on Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023 (China)
Publication Date:
OSTI Identifier:
22402857
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 15; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; DIMERS; FINITE ELEMENT METHOD; GAIN; MOLECULES; NANOTUBES; PLASMONS; RAMAN EFFECT; RESONANCE; SCATTERING; SILICON OXIDES; SILVER; STIMULATED EMISSION; SURFACES