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Related Experiment Videos

Thermal lens micro optical systems.

Manabu Tokeshi1, Jun Yamaguchi, Akihiko Hattori

  • 1Integrated Chemistry Project, Kanagawa Academy of Science and Technology (KAST), KSP East 307, 3-2-1 Sakado, Takatsu, Kawasaki, Kanagawa 213-0012, Japan.

Analytical Chemistry
|January 15, 2005
PubMed
Summary
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Two miniaturized fiber-optic thermal lens systems were developed for sensitive detection. The systems achieved low limits of detection (LOD) for chemical analysis, demonstrating their analytical potential.

Area of Science:

  • Analytical Chemistry
  • Optical Physics
  • Spectroscopy

Background:

  • Miniaturized optical systems offer advantages in portability and cost-effectiveness.
  • Thermal lens spectrometry is a sensitive technique for analyzing trace analytes.
  • Integrating optical fibers into thermal lens systems enhances miniaturization and simplifies instrumentation.

Purpose of the Study:

  • To design and evaluate two distinct miniaturized fiber-optic thermal lens systems.
  • To assess the performance of these systems using chemical standards.
  • To determine the limit of detection (LOD) for specific analytes.

Main Methods:

  • Development of two fiber-optic thermal lens systems utilizing different laser sources and SELFOC microlenses.
  • System 1: 532 nm diode-pumped solid-state laser (excitation), 635 nm laser diode (probe).

Related Experiment Videos

  • System 2: 658 nm and 780 nm laser diodes (excitation and probe).
  • Performance evaluation using standard solutions of sunset yellow (SY) and nickel(II) phthalocyaninetetrasulfonic acid tetrasodium salt (NiP).
  • Detection involved a pinhole, interference filter, and photodiode.

    • Main Results:

    • The first system achieved an LOD of 3.7 x 10(-8) M for sunset yellow.
    • The second system achieved an LOD of 7.7 x 10(-9) M for nickel(II) phthalocyaninetetrasulfonic acid tetrasodium salt.
    • The experimental LOD values were consistent with theoretical predictions based on photothermal parameters.

    Conclusions:

    • The developed miniaturized fiber-optic thermal lens systems are effective for sensitive chemical analysis.
    • These systems demonstrate excellent performance with low limits of detection.
    • The integration of fiber optics and microlenses provides a robust platform for portable analytical instrumentation.