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Title: An active metallic nanomatryushka with two similar super-resonances

The optical properties of a simple metallic nanomatryushka (nanosphere-in-a-nanoshell) with gain have been investigated theoretically. The spaser (surface plasmon amplification by stimulated emission of radiation) phenomena can be observed at two critical wavelengths in the active metallic nanomatryushkas. With increasing the gain coefficient of the middle layer, a similar super surface plasmon (SP) resonance is first found at the ω₋⁺|₁ mode of the active nanoparticles and then breaks down. With further increasing the gain coefficient, another similar super-resonance occurs at the ω₋⁻|₁ mode. The near-field enhancements in the active nanomatryushkas also have been greatly amplified at the critical wavelengths for ω₋⁺|₊ and ω₋⁻|₁ modes. It is further found that the amplifications of SPs in the active Ag–SiO₂–Au nanoshell are strongest in four kinds of nanoshells and hence the largest near fields. The giant near-field enhancement can greatly enhance the Raman excitation and emission.
Authors:
 [1] ;  [2] ; ; ;  [3]
  1. School of Physics and Technology, Nanjing Normal University, Nanjing 210023 (China)
  2. (China)
  3. School of Physics, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22306245
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; EXCITATION; GAIN; GOLD; NANOPARTICLES; OPTICAL PROPERTIES; RAMAN EFFECT; RESONANCE; SILICON OXIDES; SILVER; SIMULATION; STIMULATED EMISSION; SURFACES