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Related Experiment Videos

Optical waveguide absorption sensor using a single coupling prism.

T Okamoto1, M Yamamoto, I Yamaguchi

  • 1RIKEN (The Institute of Physical and Chemical Research), Hirosawa, Wako, Saitama, Japan. okamoto@optsun.riken.go.jp

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|October 12, 2000
PubMed
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We developed a novel optical waveguide sensor for liquid absorption measurement. This sensor achieves 17x higher sensitivity than conventional methods using a leaky guided mode.

Area of Science:

  • Optoelectronics
  • Spectroscopy
  • Chemical Sensing

Background:

  • Optical waveguide sensors are crucial for analyzing liquid samples.
  • Existing methods like attenuated total reflection (ATR) have limitations in sensitivity.
  • Precise measurement of absorption relies on sensitive detection techniques.

Purpose of the Study:

  • To propose and demonstrate a novel optical waveguide sensor for enhanced absorption measurement of liquid samples.
  • To investigate the use of a leaky guided mode for improved sensing performance.
  • To develop a theoretical model for analyzing the sensor's behavior.

Main Methods:

  • Fabrication of an optical waveguide sensor comprising a coupling prism, cladding layer, and waveguide layer.
  • Utilizing a leaky guided mode to generate dips in the reflectance spectrum.

Related Experiment Videos

  • Correlating the depth of spectral dips with the extinction coefficient of liquid samples.
  • Investigating the effect of cladding layer thickness on sensor sensitivity.
  • Developing a theoretical model to explain sensor operation.

    • Main Results:

    • The sensor's sensitivity is tunable via the cladding layer thickness.
    • The depth of reflectance dips directly relates to the sample's extinction coefficient.
    • A simple theoretical model accurately describes the sensor's behavior.
    • Experimental results demonstrated a 17-fold increase in sensitivity compared to conventional ATR methods.

    Conclusions:

    • The proposed optical waveguide sensor effectively measures liquid sample absorption.
    • Leaky guided modes offer significantly enhanced sensitivity for optical sensing applications.
    • This technology presents a promising advancement for sensitive and accurate liquid analysis.