Configuring Au and Ag nanorods for sensing applications

  • Peña-Rodríguez O
  • Pal U
  • Rodríguez-Iglesias V
 et al. 
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Abstract

We have studied optimum configurations of Au and Ag nanorods for optical
sensing applications. From the analysis of the resonance condition
by means of the quasistatic approximation, it was found that sensitivity
is controlled by two main factors: the aspect ratio of the nanorods
and their composition (the metal's bulk plasma wavelength), and it
depends linearly on both. The finding was confirmed quantitatively
using T-matrix calculations, even for particles with a radius of
40 nm, where the quasistatic approximation is no longer valid. For
ease of detection, the intensity of the surface plasmon resonance
band of the nanostructures was included along with its full-width
at half-maximum in the correction factor C, which on multiplying
with the sensitivity (Δλ_{SPR}/Δn_m) gives a
figure of merit. It has been demonstrated that the metal nanorods,
especially the larger ones, have better optical sensitivity than
the nanostructures of nanobox- or nanoshell-like geometries, which
have been reported to be the best optical sensors for these metals.

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Authors

  • Ovidio Peña-Rodríguez

  • Umapada Pal

  • Vladimir Rodríguez-Iglesias

  • Luis Rodríguez-Fernández

  • Alicia Oliver

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