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17 August 2014 The contribution of plasmon-enhanced photoluminescence to the SERS background
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We report single-photon plasmon-enhanced photoluminescence from nanostructured gold surfaces by controlling the extent of the spectral overlaps of the excitation energy hωo, the surface plasmon resonance band (with peak resonance energy hωSPR), and the critical points ΔX and ΔL, of the joint density of states of the d and sp bands, near the X- and Lsymmetry points of the electronic band structure, respectively. For hωoX (hωoX), the peak photoluminescence intensity is strongly enhanced for a strong spectral overlap of hωo~hωSPR, and weakly enhanced for a weak spectral overlap. We show that the background continuum accompanying surface-enhanced Raman scattering (SERS) spectra from benzenethiol and 4-mercaptopyridine self-assembled monolayers chemisorbed on the nanostructured gold surfaces originates from plasmon-enhanced photoluminescence. The background continuum from silver nanostructures exhibits very different characteristics, which originates from SERS of oxide and amorphous carbon on silver surfaces.
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Loan Le Thi Ngoc, Justyna Wiedemair, Albert van den Berg, and Edwin T. Carlen "The contribution of plasmon-enhanced photoluminescence to the SERS background", Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91632S (17 August 2014);

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