Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Measurement of the Internal Structure of an Optical Waveguide Embedded in a Flexible Optical Circuit Board by Enhancing the Signal Contrast of a Confocal Microscope

  • Lee, Won-Jun (Department of Information and Communication Engineering, INHA University) ;
  • Kim, Dae-Chan (Department of Information and Communication Engineering, INHA University) ;
  • O, Beom-Hoan (Department of Information and Communication Engineering, INHA University) ;
  • Park, Se-Geun (Department of Information and Communication Engineering, INHA University) ;
  • Lee, El-Hang (Department of Information and Communication Engineering, INHA University) ;
  • Lee, Seung-Gol (Department of Information and Communication Engineering, INHA University)
  • Received : 2011.02.09
  • Accepted : 2011.02.23
  • Published : 2011.03.25
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Abstract

In this study, the internal structure of an optical waveguide embedded in a flexible optical circuit board is observed with a confocal microscope. In order to increase the light reflection from an internal material interface with a very small index difference, and thus enhance the signal contrast, a theta microscopy scheme has been integrated into a conventional confocal microscope, and a high NA oil-immersion lens has been used. The interface reflectivity is increased from roughly 0.0015% to 0.025% by the proposed method, and the internal structure can thus be successfully measured.

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