Trace analysis of water pollutants by photothermal phase shift spectroscopy with an integrated optical microinterferometer

The application of photothermal interferometry and near-field thermal lensing as analytical tools in liquids is described. Using the transverse setup, the smallest detection volumes are achieved. The setups of both sensor systems are miniaturized, so adjustment and external influences are minimized. The sensitivities of both systems are demonstrated with the textile dye Reactive Red as an analyte. © 1997 Society of Photo-Optical Instrumentation Engineers.Subject terms: photoacoustic and photothermal science and engineering; photothermal interferometry; thermal lens; photothermal effect; trace analysis; white light source; lasers; microinterferometer.Paper PPS-14

show abstract

“…A passive demodulation system was used, which was developed by the authors and described in previous work. 7,8 …”

Section: Pi Systemmentioning

confidence: 99%

Miniaturized photothermal sensors as analytical tools for detection of very small volumes in chemical process control

Seidel

Faubel

1997

Opt. Eng

View full text Add to dashboard Cite

show abstract

“…where (13) (16) where is known as the Rayleigh range, determining the divergence of the beam, the beam amplitude, j the imaginary unit, and the wave vector.…”

Section: Fringe Signal Acquisition and Phase Detectionmentioning

confidence: 99%

Microfluidics and Integrated Optics Glass Sensor for In-Line Microprobing of Nuclear Samples

Schimpf

Canto

Bucci

et al. 2012

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

We study the miniaturization of Thermal Lens Spectrometry (TLS) towards Lab-on-chip integration in order to reduce the volume of fluid assays in nuclear process control. TLS is of great interest in this context since it combines the advantages of optical detection methods with an inherent suitability for smallscale samples. After validating the experimental principle in a classical thermal lens crossed-beam setup, we show the integration of a Young-interferometer with a microcapillary on a glass substrate, reducing the necessary sample size to 400 nl. The interferometer translates the photothermally induced refractive index change in the fluid to a phase shift of the fringe pattern, which can then be detected by a camera. Measurements of Co(II) in ethanol yield a detection limit of = 5 10 4 M for the crossed-beam setup and = 6 10 3 M for the integrated sensor. At an interaction length of 10 m, it detects a minimum absorbance of = 1 2 10 4 in a probed volume of 14 pl.

show abstract

“…Both configurations have been implemented in instruments like focal point displacement sensors [10], deflection sensors [11], [12], interferometers [13], or Shack-Hartmann sensors [14].…”

Section: Introductionmentioning

confidence: 99%

Microfluidics and integrated optics glass sensor for in-line microprobing of nuclear samples

Schimpf

Canto

Bucci

et al. 2011

2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

View full text Add to dashboard Cite

We study the miniaturisation of Thermal Lens Spectrometry (TLS) towards Lab-on-chip integration in order to reduce the volume of fluid assays in nuclear process control. TLS is of great interest in this context since it combines the advantages of optical detection methods with an inherent suitability for small-scale samples. After validating the experimental principle in a classical thermal lens crossed-beam setup, we show the integration of a Young-interferometer with a microcapillary on a glass substrate, reducing the necessary sample size to 400 nl. The interferometer translates the photothermally induced refractive index change in the fluid to a phase shift of the fringe pattern, which can then be detected by a camera. Measurements of Co(II) in ethanol yield a detection limit of c = 5 × 10 −4 M for the crossed-beam setup and c = 6 × 10 −3 M for the integrated sensor. At an interaction length of 10 µm, it detects a minimum absorbance of AU = 6 × 10 −5 in a probed volume of 10 pl.

show abstract

Trace analysis of water pollutants by photothermal phase shift spectroscopy with an integrated optical microinterferometer

Cited by 16 publications

References 14 publications

Miniaturized photothermal sensors as analytical tools for detection of very small volumes in chemical process control

Miniaturized photothermal sensors as analytical tools for detection of very small volumes in chemical process control

Microfluidics and Integrated Optics Glass Sensor for In-Line Microprobing of Nuclear Samples

Microfluidics and integrated optics glass sensor for in-line microprobing of nuclear samples

Contact Info

Product

Resources

About