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Integrated optical microcavities for enhanced evanescent-wave spectroscopy.

E Krioukov, D J W Klunder, A Driessen

|November 21, 2007

Summary

Integrated optical microcavities (MCs) enhance fluorescence excitation by 40 times. This technology enables sensitive detection of tiny molecule amounts for advanced spectroscopy and sensing applications.

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Area of Science:

Optics
Spectroscopy
Nanotechnology

Background:

Optical microcavities (MCs) are key components in photonics.
High-Q whispering-gallery modes in MCs enable efficient optical energy storage.
Enhanced optical fields can probe molecules in the MC cladding.

Purpose of the Study:

To investigate the use of integrated optical microcavities for enhanced optical spectroscopy and sensing.
To demonstrate enhanced fluorescence excitation using an optical microcavity.

Main Methods:

Experimental demonstration of fluorescence excitation using an integrated optical microcavity.
Comparison of fluorescence excitation between a microcavity and a straight waveguide.
Utilizing whispering-gallery modes for optical field enhancement.

Main Results:

Achieved a 40-fold increase in fluorescence excitation compared to a straight waveguide.
Demonstrated enhanced fluorescence excitation using an integrated optical microcavity for the first time.
Detected fluorescence signals from as few as 20 molecules due to the MC's small size (15 microm radius).

Conclusions:

Integrated optical microcavities significantly enhance fluorescence excitation.
The ultrasmall size and high-Q modes of MCs enable highly sensitive molecular detection.
MCs show great potential for advanced optical spectroscopy and sensing applications.