Universal infrared absorption spectroscopy using uniform electromagnetic enhancement
American Chemical Society
337 - 342
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Infrared absorption spectroscopy has greatly benefited from the electromagnetic field enhancement offered by plasmonic surfaces. However, because of the localized nature of plasmonic fields, such field enhancements are limited to nanometer-scale volumes. Here, we demonstrate that a relatively small, but spatially uniform field enhancement can yield a superior infrared detection performance compared to the plasmonic field enhancement exhibited by optimized infrared nanoantennas. A specifically designed CaF2/Al thin film surface is shown to enable observation of stronger vibrational signals from the probe material, with wider bandwidth and a deeper spatial extent of the field enhancement as compared to such plasmonic surfaces. It is demonstrated that the surface structure presented here can enable chemically specific and label-free detection of organic monolayers using surface-enhanced infrared spectroscopy, indicating a great potential in highly sensitive yet cost-effective biomolecular sensing applications.
Infrared absorption spectroscopy
Surface-enhanced infrared absorption
Electromagnetic field enhancement
Surface-enhanced infrared absorptions
Surface-enhanced infrared spectroscopy
Published Version (Please cite this version)http://dx.doi.org/10.1021/acsphotonics.5b00680
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