Surface enhanced infrared absorption (SEIRA) observed on different metal surface structures

Physics

Scientific paper

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Ion And Electron Beam-Assisted Deposition, Ion Plating

Scientific paper

Surface enhanced infrared absorption (SEIRA) spectroscopy is a novel method providing a significantly decreased limit of detection to conventional IR spectroscopy. The extent of spectral enhancement due to the presence of metal island layers is dependent on the surface morphology of the rough metal film. An improved two-staged deposition process is introduced enabling better control of the surface topology of the metal film. By modifying the angle of deposition a directional orientation of the growth process can be achieved approaching a needle-like shape of metal islands. With oblique metal deposition a significantly reduced background absorption of the metal film is obtained resulting in a decreased spectral noise. The strongest surface enhancement effect was obtained with metal layers deposited under a 18° angle.

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