The contribution of plasmon-enhanced photoluminescence to the SERS background

Loan Le Thi Ngoc; Justyna Wiedemair; Albert van den Berg; Edwin T. Carlen

doi:10.1117/12.2061688

17 August 2014 The contribution of plasmon-enhanced photoluminescence to the SERS background

Loan Le Thi Ngoc, Justyna Wiedemair, Albert van den Berg, Edwin T. Carlen

Proceedings Volume 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII; 91632S (2014) https://doi.org/10.1117/12.2061688
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

We report single-photon plasmon-enhanced photoluminescence from nanostructured gold surfaces by controlling the extent of the spectral overlaps of the excitation energy hω_o, the surface plasmon resonance band (with peak resonance energy hω_SPR), and the critical points Δ_X and Δ_L, 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 hω_o~Δ_X (hω_o<Δ_X), the peak photoluminescence intensity is strongly enhanced for a strong spectral overlap of hωo~hω_SPR, 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.

Citation Download Citation

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); https://doi.org/10.1117/12.2061688

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KEYWORDS

Nanostructuring

Gold

Luminescence

Silver

Surface enhanced Raman spectroscopy

Metals

Molecules

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