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. Author manuscript; available in PMC: 2014 Apr 4.
Published in final edited form as: J Phys Chem Lett. 2013 Mar 22;4(7):1193–1196. doi: 10.1021/jz4005043

Figure 1.

Figure 1

In blue: The normalized extinction cross-section Cext from Eq. 2. Extinction by gold spheres of 5 nm radius in aqueous suspension as a function of the wavelength of the incident light. In red: The normalized Raman enhancement, G(λ) Eq. 4 vs excitation wavelength for gold spheres of radius much smaller than the wavelength evaluated for a Raman shift of 0 nm.