The contribution of plasmon-enhanced photoluminescence to the SERS background
- Le Thi Ngoc, Loan
- Wiedemair, Justyna
- van den Berg, Albert
- Carlen, Edwin
DOIAbstract
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 hωo~ΔX (hωo<ΔX), 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 monolay...
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