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Related Experiment Videos

Noninvasive picoliter volume thermometry based on backscatter interferometry.

K Swinney1, D J Bornhop

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, USA.

Electrophoresis
|July 24, 2001
PubMed
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This study introduces a simple on-chip interferometric backscatter detector for sensitive, noninvasive thermometry. It achieves high temperature resolution in sub-nanoliter volumes using refractive index changes.

Area of Science:

  • Optical Physics
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Accurate temperature measurement in small volumes is crucial for various scientific fields.
  • Existing thermometry methods often require invasive probes or larger sample volumes.
  • Refractive index (RI) changes with temperature, offering a potential basis for noninvasive sensing.

Purpose of the Study:

  • To develop and demonstrate a sensitive, noninvasive thermometry method using an on-chip refractive index detector.
  • To achieve high temperature resolution in sub-nanoliter volumes.
  • To validate the on-chip interferometric backscatter detector (OCIBD) for precise temperature measurements.

Main Methods:

  • Utilized an on-chip interferometric backscatter detector (OCIBD) with a simple optical configuration.

Related Experiment Videos

  • Employed an unfocused laser interacting with a silica chip containing an etched hemispherical channel.
  • Monitored fringe positional changes, which correlate with fluid refractive index (RI) and thus temperature.
  • Tested the system on a N-(2-hydroxyethyl)piperazine-(2-ethanesulfonic acid) (HEPES) solution in a 188 x 10(-12) L probe volume.

    • Main Results:

    • Demonstrated sensitive, noninvasive thermometry with a temperature resolution of 9.9 x 10(-4) degrees C.
    • Achieved this resolution in a sub-nanoliter probe volume (188 x 10(-12) L).
    • The OCIBD system showed high sensitivity to RI changes, enabling precise temperature variation detection.

    Conclusions:

    • The OCIBD is a viable and effective tool for sensitive, noninvasive thermometry in small fluid volumes.
    • The system's simplicity and high sensitivity make it suitable for applications requiring precise temperature monitoring.
    • This technology opens possibilities for advanced studies in microfluidics and biological systems.