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 nm-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 optimized 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. Also, a low cost hand held infrared absorption measurement setup is demonstrated using a miniature bolometric sensor and a mobile phone. A specifically designed grating in combination with an IR light source yields an IR spectrometer covering 7-12 um range, with about 100 cm-1 resolution. Combining the enhancing substrates with the spectroscopy setup, low cost, high sensitivity mobile infrared sensing is enabled. The results have implications in homeland security and environmental monitoring as well as chemical analysis.
Aykutlu Dana, Sencer Ayas, Gokhan Bakan, Erol Ozgur, Hasan Guner, and Kemal Celebi, "Infrared absorption spectroscopy and sensing of protein monolayers using high performance enhancing substrates and a mobile phone
(Conference Presentation)," Proc. SPIE 9930, Biosensing and Nanomedicine IX, 99300M (Presented at SPIE Nanoscience + Engineering: August 30, 2016; Published: 3 November 2016); https://doi.org/10.1117/12.2237253.5164183644001.
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