Fiber-Optic Evanescent Wave Spectroscopy in the Middle Infrared

Raichlin, Yosef; Katzir, Abraham

doi:10.1366/000370208783575456

Cited by 91 publications

(52 citation statements)

References 51 publications

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“…They are based on IR transparent fibers, such as chalcogenide glasses, fluoride glasses, silica-based glasses, thallium halides, and silver halides. (49) Like in an ATR setup, the interaction between the sample and the light happens via the evanescent field. Generally, fiber waveguides show a higher sensitivity than ATR sensors as they have more reflections than an ATR sensor.…”

Section: Number Of Reflectionsmentioning

confidence: 99%

“…This sensitivity can be further increased by changing the shape of the fiber: a tapered fiber will show more reflections on the same length of the fiber, bending the fiber decreases the angle of incidence in the fiber and thereby increases the effective thickness of the measurement, and by forming the fiber into a loop, the number of reflections can further be increased. (49) Selective layers can be used to enrich the analyte close to the surface of the fiber and thereby increase the sensitivity. (50) Like ATR elements, fiber evanescent wave sensors (FEWSs) can be employed in flow cell setups, as well as in remote setups, where additional fibers guide the light from the light source to the FEWS and back to the detector.…”

Section: Number Of Reflectionsmentioning

confidence: 99%

“…(50) Like ATR elements, fiber evanescent wave sensors (FEWSs) can be employed in flow cell setups, as well as in remote setups, where additional fibers guide the light from the light source to the FEWS and back to the detector. (49) …”

Section: Number Of Reflectionsmentioning

confidence: 99%

See 2 more Smart Citations

Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Ramer

Lendl

2013

Encyclopedia of Analytical Chemistry

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Attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectroscopy is now the most widespread implementation of mid‐infrared (MIR) spectroscopy. While the FTIR technique allows the fast and stable collection of MIR spectra, the ATR technique allows mechanically stable, robust, and quick sampling. ATR‐FTIR spectroscopy is routinely used in industrial and research laboratories. The ATR‐FTIR technique finds application in, e.g. biology, medicine, forensics, process analytical chemistry and organic chemistry. Even though ATR spectroscopy is often treated as a routine technique, it has several intricacies that users should be aware of to avoid measurement errors and artifacts. In this article, starting from the theoretical underpinnings of ATR spectroscopy, we aim to give novices in ATR‐FTIR spectroscopy the knowledge to successfully use this technique and to avoid common errors. The theoretical treatment of ATR spectroscopy is complemented by practical information about the routine and advanced uses of ATR spectroscopy. Furthermore, the reader will find descriptions of future trends in ATR‐FTIR and evanescent wave spectroscopy. Finally, a list of literature for further reading and a list of vendors of ATR accessories and their product lines are given to facilitate using the ATR technique.

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Section: Number Of Reflectionsmentioning

confidence: 99%

Section: Number Of Reflectionsmentioning

confidence: 99%

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Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Ramer

Lendl

2013

Encyclopedia of Analytical Chemistry

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“…These new techniques require the development of materials that can effectively collect and transmit the infrared signal but which can also be shaped into appropriate optical components. The recent development of infrared Fiber Evanescent Wave Spectroscopy (FEWS) is an example of such technologies [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Opto-electrophoretic detection of bio-molecules using conducting chalcogenide glass sensors

Yang¹,

Fah²,

Reynolds³

et al. 2010

Opt. Express

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Novel telluride glasses with high electrical conductivity, wide infrared transparency and good resistance to crystallization are used to design an opto-electrophoretic sensor for detection and identification of hazardous microorganisms. The sensor is based on an attenuated total reflectance element made of Ge-As-Te glass that serves as both an optical sensing zone and an electrode for driving the migration of bio-molecules within the evanescent wave of the sensor. An electric field is applied between the optical element and a counter electrode in order to induce the migration of bio-molecules carrying surface charges. The effect of concentration and applied voltage is tested and the migration effect is shown to be reversible upon switching the electric field. The collected signal is of high quality and can be used to identify different bacterial genus through statistical spectral analysis. This technique therefore provides the ability to detect hazardous microorganisms with high specificity and high sensitivity in aqueous environments. This has great potential for online monitoring of water quality.

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“…So far, FTIR absorption spectroscopy of living cells has been performed using synchrotron radiation [21,22], ATR [23,24,25,26], or evanescent field of the infrared fiber [27]; while the surface plasmon has been mostly used for detecting structural modifications in cells. Combination of surface plasmon resonance with spectroscopy can be particularly useful in the study of drug penetration into cells, since it can measure not only the spectroscopic signature of drug but the cell reaction to this drug as well.…”

Section: Introductionmentioning

confidence: 99%

Infrared Surface Plasmon Spectroscopy of Living Cells

Yashunsky¹,

Zilberstein²,

Marciano³

et al. 2010

AIP Conference Proceedings

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We report a spectroscopic technique that combines the Fourier-Transform Infrared Spectroscopy with the Surface Plasmon Resonance. This tool enables sensitive infrared spectroscopy of liquid and solid objects in the attenuated total reflectance mode. The FTIR-SPR technique is similar to FTIR-ATR technique but has higher sensitivity due to resonance amplification of the surface electric field. The label-free FTIR-SPR technique is especially advantageous for living cell studies since it combines spectroscopic information inherent to FTIR with structural information provided by the Surface Plasmon Resonance. We discuss the FTIR-SPR technique for label-free studies of cell sedimentation and spreading on substrate and for surface plasmon spectroscopy.PACS 05. 52.35.Mw, 96.50.Fm.

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Fiber-Optic Evanescent Wave Spectroscopy in the Middle Infrared

Cited by 91 publications

References 51 publications

Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Attenuated Total ReflectionFourier Transform Infrared Spectroscopy

Opto-electrophoretic detection of bio-molecules using conducting chalcogenide glass sensors

Infrared Surface Plasmon Spectroscopy of Living Cells

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