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Optimization of SERS-active substrates for near-field Raman spectroscopy

Abstract : As a first step towards near-field Raman, we chose to study surface enhanced Raman scattering (SERS)-active substrates to cope with the weakness of Raman scattering (small cross-section and low concentration). We concentrated our work on localized surface plasmon (LSP) since they turned out to play a great part in SERS and we put forward the relation between LSP resonance and Raman enhancement. Roughness of our samples is controlled either by annealing process or electron-beam lithography (EBL); this latter technique proved to best suit to our study. Substrates are characterized by extinction spectroscopy which determines the LSP resonance and then Raman spectrum of a probe molecule, trans-1,2-bis(4-pyridyl)ethylene (BPE) is recorded. We show that maximum of enhancement is obtained when the LSP resonance is red-shifted (50 nm) compared to the excitation laser line (632.8 nm).
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Contributor : Jean-Baptiste VU VAN Connect in order to contact the contributor
Submitted on : Tuesday, November 19, 2019 - 12:02:05 PM
Last modification on : Sunday, June 26, 2022 - 4:44:23 AM

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Johan Grand, Serguei Kochtcheev, Jean-Louis Bijeon, Marc Lamy de La Chapelle, Pierre-Michel Adam, et al.. Optimization of SERS-active substrates for near-field Raman spectroscopy. Synthetic Metals, Elsevier, 2003, 139 (3), pp.621-624. ⟨10.1016/S0379-6779(03)00276-5⟩. ⟨hal-02370060⟩



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