Assessing the location of surface plasmons over nanotriangle and nanohole arrays of different size and periodicity

Debby Correia-Ledo, Kirsty F. Gibson, Anuj Dhawan, Maxime Couture, Tuan Vo-Dinh, Duncan Graham, Jean-Francois Masson

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The increasing popularity of surface plasmon resonance (SPR) and surface enhanced Raman scattering (SERS) sensor design based on nanotriangle or nanohole arrays, and the possibility to manufacture substrates at the transition between these plasmonic substrates, makes them ideal candidates for the establishment of structure property relationships. This work features near diffraction-limited Raman images and finite-difference time-domain (FDTD) simulations of nanotriangle and nanohole array substrates, which clearly demonstrate that the localization of the hot spot on these SERS substrates is significantly influenced by the ratio of diameter/periodicity (D/P). The experimental and simulation data reveal that the hot spots are located around nanotriangles (D/P = 1), characteristic of localized SPR. Decreasing the D/P ratio to 0.75-0.7 led to the creation of nanohole arrays, which promoted the excitation of a propagating surface plasmon (SP) delocalized over the metal network. The optimal SERS intensity was consistently achieved at this transition from nanotriangles to nanoholes, for every periodicity (650 nm to 1.5 mu m) and excitation wavelength (633 and 785 nm) investigated, despite the presence or absence of a plasmonic band near the laser excitation. Further decreasing the D/P ratio led to excitation of a localized SP located around the rim of nanohole arrays for D/P of 0.5-0.6, in agreement with previous reports. In addition, this manuscript provides the first evidence that the hot spots are positioned inside the hole for D/P of 0.4, with the center being the region of highest electric field and Raman intensity. The compelling experimental evidence and FDTD simulations offer an overall understanding of the plasmonic properties of nanohole arrays as SERS and SPR sensors, which is of significant value in advancing the diversity of applications from such surfaces,

LanguageEnglish
Pages6884-6892
Number of pages9
JournalJournal of Physical Chemistry C
Volume116
Issue number12
DOIs
Publication statusPublished - 29 Mar 2012

Fingerprint

Plasmons
plasmons
periodic variations
Raman scattering
Surface plasmon resonance
surface plasmon resonance
Raman spectra
Substrates
excitation
Laser excitation
sensors
Sensors
data simulation
rims
simulation
Diffraction
Metals
Electric fields
Wavelength
electric fields

Keywords

  • surface plasmon resonance (SPR)
  • surface enhanced Raman scattering
  • SERS
  • plasmonic substrates

Cite this

Correia-Ledo, Debby ; Gibson, Kirsty F. ; Dhawan, Anuj ; Couture, Maxime ; Vo-Dinh, Tuan ; Graham, Duncan ; Masson, Jean-Francois. / Assessing the location of surface plasmons over nanotriangle and nanohole arrays of different size and periodicity. In: Journal of Physical Chemistry C. 2012 ; Vol. 116, No. 12. pp. 6884-6892.
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Assessing the location of surface plasmons over nanotriangle and nanohole arrays of different size and periodicity. / Correia-Ledo, Debby; Gibson, Kirsty F.; Dhawan, Anuj; Couture, Maxime; Vo-Dinh, Tuan; Graham, Duncan; Masson, Jean-Francois.

In: Journal of Physical Chemistry C, Vol. 116, No. 12, 29.03.2012, p. 6884-6892.

Research output: Contribution to journalArticle

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