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SERS enhancements via periodic arrays of gold nanoparticles on silver film structures

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Abstract

We discuss surface enhanced Raman spectroscopy (SERS) structures aimed at providing robust and reproducible enhancements. The structures involve periodic arrays of gold nanospheres near silver film structures that may also be patterned. They enable one to excite Bloch wave surface plasmon polaritons (SPPs) that can also couple to local surface plasmons (LSPs) of the nanospheres, leading to the possibility of multiplicative enhancements. If the magnitude of the average electric field, ∣E∣, between the particles is enhanced by g such that ∣E∣ = gE 0∣, ∣E 0∣ being the incident field, realistic finite-difference time-domain simulations show that under favorable circumstances g ≈ 0.6 g SPP g LSP, where g SPP and g LSP are enhancement factors associated with the individual components. SERS enhancements for the structures can be as high as O(g 4) = 108.

©2009 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. Proposed SERS substrates (a) Structure I (b) Structure II. See text for details.
Fig. 2.
Fig. 2. (a) Reflection spectra for structure I without (red linepoints) and with (blue) particles present calculated via FDTD. Steady state electric field intensities at λ0 = 633 nm for the unit cell corresponding to Fig. 1(a) (b) without particles, (c) with particles, and (d) with particles and PMLs. See text for discussion.
Fig. 3.
Fig. 3. (a) Reflection spectra for structure II with d = 0 nm (red linespoints) and d = 40 nm (blue). Inset corresponds to structure II with PMLs. Steady state electric field intensities (b) for the m = 1 BW-SPP with no particles present, (c) d = 40 nm with particles present, and (d) d = 0 with particles present. (All intensities > 30 ∣E0 2 are saturated in yellow)

Equations (1)

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λ0Pm(εAg(λ0)εdielectricεAg(λ0)+εdielectric)1/2 .
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