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The actual surface area of a gold-coated conductive layer over the laser nano-textured surface of sapphire is determined using an electrochemical cyclic voltammetry. The method is down scaled to measure the sensing surface area of 200 × 200 μm2 on a laser-ablated ripple sensor used for surface-enhanced Raman spectroscopy/scattering (SERS). Ripple SERS sensors made on different substrates of high refractive...
Surface enhanced Raman scattering (SERS) measurements have been carried out at different focusing conditions using objective lenses of different numerical apertures. The experimentally observed dependence of SERS intensity of thiophenol-coated Ag nano-islands shows a close-to-linear scaling with the collection aperture. The linear relationship breaks down for large numerical apertures, which suggests...
Femtosecond laser fabrication is used to make complex micro-/nano-scale structures: though-holes in optical fiber and textured indium tin oxide films. Formation mechanisms of ripples on the horizontal and vertical surfaces/walls are discussed.
We propose a novel substrate for SERS bio-sensing composed of an hexagonal array of gold nanorods embedded in an anodically-oxidized alumina substrate, reaching a surface field enhancement up to 220 times.
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