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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 5 — Jun. 6, 2013

Real-time polarimetric optical sensor using macroporous alumina membranes

Jesús Álvarez, Carlos Serrano, Daniel Hill, and Juan Martínez-Pastor  »View Author Affiliations


Optics Letters, Vol. 38, Issue 7, pp. 1058-1060 (2013)
http://dx.doi.org/10.1364/OL.38.001058


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Abstract

We report on the demonstration of real-time refractive index sensing within 60 μm thick free-standing macroporous alumina membranes with pore diameters of 200 nm. The free-standing macroporous alumina membranes allow the analytes to flow through the pores for targeted delivery, resulting in fast sensing responses. The polarimetric measurement platform exploits the optical anisotropy of the membranes in monitoring the refractive index variations of the analytes that fill the pores, providing highly sensitive and real-time measurements. The experimental characterization of the membranes’ birefringence at wavelengths of 808, 980, and 1500 nm showed a decrease in birefringence for shorter wavelengths caused by the depolarization process that takes place when polarized light passes through a porous medium. Volumetric sensing experiments performed at the same wavelengths demonstrated detection limits of 8.1×106, 5.2×106, and 6×106 refractive index units at wavelengths of 808, 980, and 1500 nm, respectively.

© 2013 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(130.6010) Integrated optics : Sensors
(260.1440) Physical optics : Birefringence
(260.3060) Physical optics : Infrared
(260.5430) Physical optics : Polarization
(280.1415) Remote sensing and sensors : Biological sensing and sensors

ToC Category:
Physical Optics

History
Original Manuscript: February 11, 2013
Revised Manuscript: February 25, 2013
Manuscript Accepted: February 25, 2013
Published: March 20, 2013

Virtual Issues
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Jesús Álvarez, Carlos Serrano, Daniel Hill, and Juan Martínez-Pastor, "Real-time polarimetric optical sensor using macroporous alumina membranes," Opt. Lett. 38, 1058-1060 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-38-7-1058


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