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Proceedings Paper

Infrared absorption spectroscopy and sensing of protein monolayers using high performance enhancing substrates and a mobile phone (Conference Presentation)
Author(s): Aykutlu Dana; Sencer Ayas; Gokhan Bakan; Erol Ozgur; Hasan Guner; Kemal Celebi
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Paper Abstract

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.

Paper Details

Date Published: 3 November 2016
PDF: 1 pages
Proc. SPIE 9930, Biosensing and Nanomedicine IX, 99300M (3 November 2016); doi: 10.1117/12.2237253
Show Author Affiliations
Aykutlu Dana, Bilkent Univ. (Turkey)
Sencer Ayas, Bilkent Univ. (Turkey)
Gokhan Bakan, Bilkent Univ. (Turkey)
Erol Ozgur, Bilkent Univ. (Turkey)
Hasan Guner, Bilkent Univ. (Turkey)
Kemal Celebi, Bilkent Univ. (Turkey)

Published in SPIE Proceedings Vol. 9930:
Biosensing and Nanomedicine IX
Hooman Mohseni; Massoud H. Agahi; Manijeh Razeghi, Editor(s)

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