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Title: Spaser based on Fano resonance in a rod and concentric square ring-disk nanostructure

This paper reports a spaser based on Fano resonance of a plasmonic nanostructure consisting of a rod and concentric square ring-disk structure coated with a layer of gain media. The amplification of the dark quadrupolar mode at the Fano resonance wavelength causes the spaser with a high Purcell factor of 3.24 × 10{sup 7}, a high signal to noise ratio of 4.4 × 10{sup 6}, and a lower threshold of 0.02086. These significant optical properties are attributed to the greatly enhanced spontaneous emission and depressed radiation loss supported by the strong localized dark mode at the Fano resonance wavelength.
Authors:
; ; ; ; ;  [1] ;  [2]
  1. State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062 (China)
  2. Department of Physics, Tianjin Polytechnic University, Tianjin 300387 (China)
Publication Date:
OSTI Identifier:
22257736
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; GAIN; NANOSTRUCTURES; OPTICAL PROPERTIES; RESONANCE; SIGNAL-TO-NOISE RATIO