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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Characterization of high-Q optical microcavities using confocal microscopy.

Rajan P Kulkarni1, Scott E Fraser, Andrea M Armani

  • 1Division of Biology, M/C 139-74 California Institute of Technology, Pasadena, CA 91125, USA.

Optics Letters
|December 17, 2008
PubMed
Summary

Confocal microscopy now quantifies optical resonant cavity Q factor by measuring fluorescent signals from surface defects. This noninvasive technique offers an alternative to traditional linewidth measurements for defect characterization.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microscopy

Background:

  • Confocal microscopy traditionally images circuits and material defects qualitatively.
  • Previous studies lacked quantitative defect analysis in optical microcavities.
  • Surface scattering is a primary loss mechanism affecting microcavity performance.

Purpose of the Study:

  • To develop a noninvasive method for quantitative assessment of optical resonant cavity Q factor.
  • To correlate fluorescent signal intensity with surface scattering defects.
  • To establish confocal microscopy as a tool for quantitative optical microcavity characterization.

Main Methods:

  • Utilized confocal microscopy to image optical resonant cavities.
  • Measured fluorescent signal intensity to quantify surface scattering defects.
  • Determined cavity Q factor using both confocal microscopy and conventional linewidth measurements.

Main Results:

  • Fluorescent signal intensity directly correlates with the number of surface scattering defects.
  • Quantitative Q factor values obtained from confocal microscopy align with linewidth measurements.
  • Demonstrated that Q factor can be determined noninvasively via fluorescent defect analysis.

Conclusions:

  • Confocal microscopy provides a noninvasive route to quantitatively determine optical resonant cavity Q factor.
  • This method bypasses the need for traditional, potentially invasive, linewidth measurements.
  • Offers a valuable new technique for characterizing optical microcavities and understanding loss mechanisms.