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Ultra-high-Q microcavity operation in H2O and D2O

Armani, A. M. and Armani, D. K. and Min, B. and Vahala, K. J. and Spillane, S. M. (2005) Ultra-high-Q microcavity operation in H2O and D2O. Applied Physics Letters, 87 (15). Art no 151118. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:ARMapl05

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Abstract

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.


Item Type:Article
Additional Information:©2005 American Institute of Physics (Received 25 April 2005; accepted 8 September 2005; published online 7 October 2005) The authors would like to thank Prof. George Whitesides at Harvard University for his suggestion to investigate D2O. This work was supported by the DARPA Center for Opto-Fluidics at the California Institute of Technology.
Record Number:CaltechAUTHORS:ARMapl05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ARMapl05
Alternative URL:http://dx.doi.org/10.1063/1.2099529
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1055
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:15 Dec 2005
Last Modified:26 Dec 2012 08:42

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