title: Double-resonance plasmon substrates for surface-enhanced Raman scattering with enhancement at excitation and stokes frequencies.
abstract: We report a surface-enhanced Raman scattering (SERS) substrate with plasmon resonances at both excitation and Stokes frequencies. This multilayer structure combines localized surface plasmons on the nanoparticles with surface plasmon polaritons excited on a gold film. The largest SERS enhancement factor for a gold device is measured to be 7.2 x 10(7), which is more than 2 orders of magnitude larger than that measured on a gold nanoparticle array on a glass substrate. The largest SERS enhancement for a silver device is measured to be 8.4 x 10(8).
authors.affiliation: School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, Massachusetts 02138, USA.
authors.forename: Yizhuo
authors.initials: Y
authors.lastname: Chu
authors.forename: Mohamad G
authors.initials: MG
authors.lastname: Banaee
authors.forename: Kenneth B
authors.initials: KB
authors.lastname: Crozier