Shining New Light on Old Principles: Localization of Evanescent Field Interactions at Infrared–Attenuated Total Reflection Sensing Interfaces

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Abstract:

A combined experimental and spectral ray tracing approach for identifying and evaluating evanescent field interactions with discrete surface deposits along a horizontal attenuated total reflection (HATR) element is presented. By experimentally depositing poly(styrene-co-butadiene) (PSCB) residues at fixed intervals along the measurement surface of a HATR crystal, distinct regions of evanescent field interaction with the surface deposits along the multi-reflection waveguide are visualized via infrared absorption features of PSCB. The infrared–attenuated total reflection (IR-ATR) measurements were confirmed by spectral ray tracing analysis simulating transmission–absorption spectra after modeling the polymeric surface deposits as thin-film IR absorbing cylinders. The presented analytical procedures and simulations provide a generic strategy for identifying and evaluating "active" sensing regions along ATR elements. Additionally, the simulated ATR setup along with the presented spectral ray tracing procedures provide a virtual platform aiding the development, optimization, and integration of deep-sea IR-ATR sensor probes with submersible mid-infrared spectrometers for in situ marine monitoring applications, which was the initial motivation for these studies.

Keywords: DEEP-SEA SENSING; HATR; HORIZONTAL ATTENUATED TOTAL REFLECTION; INFRARED EVANESCENT FIELD SENSING; INFRARED-ATTENUATED TOTAL REFLECTION SPECTROSCOPY; IR-ATR; MARINE SPECTROSCOPY; MID-INFRARED CHEMICAL SENSORS; SPECTRAL RAY TRACING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370206777670585

Affiliations: Georgia Institute of Technology, School of Chemistry and Biochemistry, Applied Sensors Laboratory, Boggs Chemistry Building, 770 State St., Atlanta, Georgia 30332-0400

Publication date: June 1, 2006

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