Ultra-high-Q microcavity operation in H2O and D2O

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Optical microcavities provide a possible method for boosting the detection sensitivity of biomolecules. Silica-based microcavities are important because they are readily functionalized, which enables unlabeled detection. While silica resonators have been characterized in air, nearly all molecular detections are performed in solution. Therefore, it is important to determine their performance limits in an aqueous environment. In this letter, planar microtoroid resonators are used to measure the relationship between quality factor and toroid diameter at wavelengths ranging from visible to near-IR in both H2O and D2O, and results are then compared to predictions of a numerical model. Quality factors (Q) in excess of 10(8), a factor of 100 higher than previous measurements in an aqueous environment, are observed in both H2O and D2O. (C) 2005 American Institute of Physics.
Publisher
AMER INST PHYSICS
Issue Date
2005-10
Language
English
Article Type
Article
Keywords

MICROSPHERES; CAVITIES; SHIFT; CHIP

Citation

APPLIED PHYSICS LETTERS, v.87, no.15

ISSN
0003-6951
DOI
10.1063/1.2099529
URI
http://hdl.handle.net/10203/88711
Appears in Collection
ME-Journal Papers(저널논문)
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