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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 19 — Sep. 17, 2007
  • pp: 12011–12016

Refractometric sensor based on whispering-gallery modes of thin capillaries

Vanessa Zamora, Antonio Díez, Miguel V. Andrés, and Benito Gimeno  »View Author Affiliations


Optics Express, Vol. 15, Issue 19, pp. 12011-12016 (2007)
http://dx.doi.org/10.1364/OE.15.012011


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Abstract

Whispering-gallery modes resonances of submicron wall thickness capillaries exhibit very large wavelength shifts as a function of the refractive index of the medium that fills the inside. The sensitivity to refractive index changes is larger than in other optical microcavities as microspheres, microdisks and microrings. The outer surface where total internal reflection takes place remains always in air, enabling the measure of refractive index values higher than the refractive index of the capillary material. The fabrication of capillaries with submicron wall thickness has required the development of a specific technique. A refractometer with a response higher than 390 nm per refractive index unit is demonstrated. These sensors are readily compatible with microfluidic systems.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(230.4000) Optical devices : Microstructure fabrication
(230.5750) Optical devices : Resonators
(240.6690) Optics at surfaces : Surface waves
(290.3030) Scattering : Index measurements

ToC Category:
Optical Devices

History
Original Manuscript: July 19, 2007
Revised Manuscript: August 17, 2007
Manuscript Accepted: August 18, 2007
Published: September 5, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Vanessa Zamora, Antonio Díez, Miguel V. Andrés, and Benito Gimeno, "Refractometric sensor based on whispering-gallery modes of thin capillarie," Opt. Express 15, 12011-12016 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-19-12011


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