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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 11 — Jun. 1, 2013
  • pp: 1951–1953

Surface plasmon resonance optical cavity enhanced refractive index sensing

A. Giorgini, S. Avino, P. Malara, G. Gagliardi, M. Casalino, G. Coppola, M. Iodice, P. Adam, K. Chadt, J. Homola, and P. De Natale  »View Author Affiliations

Optics Letters, Vol. 38, Issue 11, pp. 1951-1953 (2013)

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We report on a method for surface plasmon resonance (SPR) refractive index sensing based on direct time-domain measurements. An optical resonator is built around an SPR sensor, and its photon lifetime is measured as a function of loss induced by refractive index variations. The method does not rely on any spectroscopic analysis or direct intensity measurement. Time-domain measurements are practically immune to light intensity fluctuations and thus lead to high resolution. A proof of concept experiment is carried out in which a sensor response to liquid samples of different refractive indices is measured. A refractive index resolution of the current system, extrapolated from the reproducibility of cavity-decay time determinations over 133 s, is found to be about 105RIU. The possibility of long-term averaging suggests that measurements with a resolution better than 107RIU/Hz are within reach.

© 2013 Optical Society of America

OCIS Codes
(230.5750) Optical devices : Resonators
(240.6680) Optics at surfaces : Surface plasmons
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Optics at Surfaces

Original Manuscript: April 4, 2013
Revised Manuscript: May 9, 2013
Manuscript Accepted: May 9, 2013
Published: May 30, 2013

A. Giorgini, S. Avino, P. Malara, G. Gagliardi, M. Casalino, G. Coppola, M. Iodice, P. Adam, K. Chadt, J. Homola, and P. De Natale, "Surface plasmon resonance optical cavity enhanced refractive index sensing," Opt. Lett. 38, 1951-1953 (2013)

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