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15 May 2001 Integrated optical microcavities for spectroscopy
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Proceedings Volume 4277, Integrated Optics Devices V; (2001)
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States
The potential of integrated optical micro cavities (MC) for use in enhanced optical spectroscopy has been studied. The MC devices can sustain high morphological enhancement of optical field due to excitation of high-Q whispering gallery modes. The evanescent near field of the MC can be used to excite spectroscopic signal of molecules pout on top of the MC. Estimation shows that both local excitation field and emitted field can be increased y 2-3 orders of magnitude in the MC on resonance. In total, a gain of 4-8 orders of magnitude in the Raman/fluorescent signal of a molecule near the MC can be expected. In addition, the MC delivers a tunable and measurable enhancement, which is a real benefit in terms of enhanced optical microspectroscopy on-chip. High-Finesse integrated optics cylindrical micro cavities capable of significant field enhancement have been fabricated. Use of various waveguide/MC coupling schemes and design parameters allowed optimization of the devices for the largest intra-cavity power. The result for different micro cavities show prominent enhancement of intra-cavity field correlating with its mode spectrum. The characterization of MC and measurements performed demonstrate feasibility of the MC-based device for optical spectroscopy.
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Evgueni Krioukov, Dion J.W. Klunder, Jan Greve, Alfred Driessen, and Cees Otto "Integrated optical microcavities for spectroscopy", Proc. SPIE 4277, Integrated Optics Devices V, (15 May 2001);

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