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Microresonator array for high-resolution spectroscopy.

Gustav Schweiger1, Ralf Nett, Thomas Weigel

  • 1Department of Mechanical Engineering, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, Bochum, Germany. Schweiger@lat.rub.de

Optics Letters
|September 18, 2007
PubMed
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Researchers developed a novel spectroscopic device using an array of spherical microresonators. This system achieves high-resolution wavelength identification by analyzing light patterns, offering a miniaturized solution for spectroscopy.

Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Materials Science

Background:

  • Miniaturized spectroscopic devices are crucial for high-resolution analysis.
  • Spherical microresonators offer unique optical properties for sensing applications.

Purpose of the Study:

  • To investigate the potential of an array of spherical microresonators as a miniaturized, high-resolution spectroscopic device.
  • To demonstrate wavelength identification using evanescently coupled light patterns.

Main Methods:

  • Sixteen polymethyl methacrylate microspheres were arranged on an optical waveguide (microscope slide).
  • A tunable narrowband laser excited an evanescent wave on the slide, interacting with the microresonator array.
  • A CCD camera recorded the wavelength-dependent intensity pattern generated by the evanescent field.

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Main Results:

  • The evanescent field created a distinct intensity pattern sensitive to the laser's wavelength.
  • The calibrated pattern allowed for precise wavelength identification.
  • A high spectral resolution of R ~ lambda/Deltalambda = 7 x 10(4) was achieved.

Conclusions:

  • An array of spherical microresonators can function as a miniaturized, high-resolution spectroscopic instrument.
  • This approach offers a novel method for wavelength determination based on optical intensity patterns.
  • The demonstrated resolution highlights the potential for advanced spectroscopic applications.