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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 14 — May. 10, 2012
  • pp: 2752–2758

On the sensitivity of generic porous optical sensors

Tom G. Mackay  »View Author Affiliations


Applied Optics, Vol. 51, Issue 14, pp. 2752-2758 (2012)
http://dx.doi.org/10.1364/AO.51.002752


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Abstract

A porous material was considered as a platform for optical sensing. It was envisaged that the porous material was infiltrated by a fluid that contains an agent to be sensed. Changes in the optical properties of the infiltrated porous material provide the basis for detection of the agent to be sensed. Using a homogenization approach based on the Bruggeman formalism, wherein the infiltrated porous material was regarded as a homogenized composite material, the sensitivity of such a sensor was investigated. For the case of an isotropic dielectric porous material of relative permittivity ϵa and an isotropic dielectric fluid of relative permittivity ϵb, it was found that the sensitivity was maximized when there was a large contrast between ϵa and ϵb; the maximum sensitivity was achieved at midrange values of porosity. Especially high sensitivities may be achieved for ϵb close to unity when ϵa1, for example. Furthermore, higher sensitivities may be achieved by incorporating pores that have elongated spheroidal shapes.

© 2012 Optical Society of America

OCIS Codes
(160.1245) Materials : Artificially engineered materials
(260.2065) Physical optics : Effective medium theory
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: January 12, 2012
Revised Manuscript: February 15, 2012
Manuscript Accepted: February 20, 2012
Published: May 10, 2012

Virtual Issues
Vol. 7, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Tom G. Mackay, "On the sensitivity of generic porous optical sensors," Appl. Opt. 51, 2752-2758 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-14-2752


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