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 and , and results are then compared to predictions of a numerical model. Quality factors in excess of , a factor of 100 higher than previous measurements in an aqueous environment, are observed in both and .
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10 October 2005
Research Article|
October 07 2005
Ultra-high- microcavity operation in and
A. M. Armani;
A. M. Armani
Department of Applied Physics,
California Institute of Technology
, Pasadena, California 91125
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D. K. Armani;
D. K. Armani
Department of Applied Physics,
California Institute of Technology
, Pasadena, California 91125
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B. Min;
B. Min
Department of Applied Physics,
California Institute of Technology
, Pasadena, California 91125
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K. J. Vahala;
K. J. Vahala
a)
Department of Applied Physics,
California Institute of Technology
, Pasadena, California 91125
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S. M. Spillane
S. M. Spillane
Quantum Science Research,
Hewlett-Packard Laboratories
, Palo Alto, California 94304
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a)
Author to whom correspondence should be addressed; electronic mail: vahala@caltech.edu. Related work can be located at http://www.vahala.caltech.edu
Appl. Phys. Lett. 87, 151118 (2005)
Article history
Received:
April 25 2005
Accepted:
September 08 2005
Citation
A. M. Armani, D. K. Armani, B. Min, K. J. Vahala, S. M. Spillane; Ultra-high- microcavity operation in and . Appl. Phys. Lett. 10 October 2005; 87 (15): 151118. https://doi.org/10.1063/1.2099529
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