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Title: Spectral investigation of nonlinear local field effects in Ag nanoparticles

The capability of Ag nanoparticles to modulate their optical resonance condition, by optical nonlinearity, without an external feedback system was experimentally demonstrated. These optical nonlinearities were studied in the vicinity of the localized surface plasmon resonance (LSPR), using femtosecond pump-and-probe spectroscopy with a white-light continuum probe. Transient transmission changes ΔT/T exhibited strong photon energy and particle size dependence and showed a complex and non-monotonic change with increasing pump light intensity. Peak position and change of sign redshift with increasing pump light intensity demonstrate the modulation of the LSPR. These features are discussed in terms of the intrinsic feedback via local field enhancement.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. School of Pure and Applied Sciences, University of Tsukuba, Tsukuba (Japan)
  2. (Japan)
  3. Faculty of Engineering, Hokkaido University, Sapporo (Japan)
  4. National Institute for Materials Science, Tsukuba (Japan)
Publication Date:
OSTI Identifier:
22399293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 11; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; MODULATION; NANOPARTICLES; NONLINEAR PROBLEMS; PARTICLE SIZE; PHOTONS; PLASMONS; PROBES; RED SHIFT; RESONANCE; SURFACES; TRANSIENTS; VISIBLE RADIATION