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Tuning D* with modified thermal detectors.

M N Simcock1, M L Myrick

  • 1University of South Carolina, Columbia, South Carolina 29208, USA.

Applied Spectroscopy
|January 16, 2007
PubMed
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Modified thermopile detectors coated with polymer films show reduced spectral detectivity (D*) but offer tailored spectral responses for improved analytical precision. This advancement enhances optical systems for applications like multivariate optical computing and photometry.

Area of Science:

  • Sensor Technology
  • Optical Spectroscopy
  • Materials Science

Background:

  • Thermopile detectors are widely used for optical sensing.
  • Tailoring spectral response is crucial for specific analyte detection.
  • Existing detectors may lack specificity for certain analytical methods.

Purpose of the Study:

  • To fabricate and characterize a modified thermopile detector with a polymer film coating.
  • To investigate how polymer film absorbance influences spectral detectivity.
  • To enhance the precision of optical systems for applications like multivariate optical computing and photometry.

Main Methods:

  • Coating a silicon thermopile detector with a metal mirror and a polymer film.
  • Utilizing a textured surface to eliminate interference effects.

Related Experiment Videos

  • Measuring spectral detectivity (D*) at a 10 Hz modulation frequency.

    • Main Results:

    • The modified detector's spectral detectivity is primarily determined by the polymer film's absorbance.
    • Maximum detectivity with a 1-micrometer-thick film reached 20% of the original detector's detectivity at 10 Hz.
    • Estimated thermal diffusion length in the polymer at 10 Hz was 40 micrometers.

    Conclusions:

    • The modified thermopile detector enables tailored spectral responses for improved analytical precision.
    • Detectivity can be approximated by the product of the underlying detector's D* and the film's absorbance at low frequencies.
    • This approach offers a method to enhance optical systems for specific analyte detection.