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Surface Enhanced Coherent Anti-Stokes Raman Scattering on Nanostructured Gold Surfaces

Steuwe C, Kaminski CF, Baumberg JJ, Mahajan S, "Surface Enhanced Coherent Anti-Stokes Raman Scattering on Nanostructured Gold Surfaces", Nano Letters 2011 11 (12), 5339-5343, DOI: 10.1021/nl202875w | pdf


Abstract

Coherent anti-Stokes Raman spectroscopy (CARS) is a well-known tool in multiphoton imaging and nonlinear spectroscopy. In this work we combine CARS with plasmonic surface enhancement on reproducible nanostructured surfaces. We demonstrate strong correlation between plasmon resonances and surface-enhanced CARS (SECARS) intensities on our nanostructured surfaces and show that an enhancement of ∼105 can be obtained over standard CARS. Furthermore, we find SECARS to be >103 times more
sensitive than surface-enhanced Raman Spectroscopy (SERS). We also demonstrate SECARS imaging of molecular monolayers. Our work paves the way for reliable single molecule Raman spectroscopy and fast molecular imaging on plasmonic surfaces.