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Electric field enhancement and concomitant Raman spectral effects at the edges of a nanometre-thin gold mesotriangle
Panikkanvalappil Ravindranathan Sajanlal,
Published in
2010
Volume: 20
   
Issue: 11
Pages: 2108 - 2113
Abstract
The local electric field enhancement at various regions of an individual nanometre-thin gold mesotriangle has been demonstrated both numerically and experimentally. This work provides, for the first time, direct experimental evidence of localized enhancement of Raman signals at three edges of nanometre-thin gold mesotriangles at single particle level, using Raman microscopy. Raman images were collected from mesotriangles of ∼11 μm edge length and ∼30 nm thickness, using adsorbed crystal violet as the probe molecule. Spatial distribution and the extent of electric field enhancement around a single mesotriangle are investigated theoretically by finite-difference time-domain (FDTD) simulations. Confocal Raman studies provided direct proof for the substantial electrical field enhancement at the edges and corners compared to the face of the mesotriangle. The simulated electric field enhancement was in the order, corner > edge > surface, which is in complete agreement with the experimental results. © 2010 The Royal Society of Chemistry.
About the journal
JournalJournal of Materials Chemistry
ISSN09599428
Open AccessNo
Concepts (21)
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    Confocal raman
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    Crystal violet
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    Edge length
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    Electric field enhancement
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    Electrical field
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    Experimental evidence
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    FINITE-DIFFERENCE TIME-DOMAIN SIMULATION
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    Local electric field
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    NANOMETRES
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    Probe molecules
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    RAMAN IMAGES
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    Raman microscopy
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    RAMAN SIGNAL
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    Single particle
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    Spatial distribution
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    SPECTRAL EFFECTS
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    ELECTRIC FIELD MEASUREMENT
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    Finite difference time domain method
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    Gold
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    Raman spectroscopy
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    Electric fields