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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 4 — Feb. 15, 2010
  • pp: 3226–3237

On-chip temperature compensation in an integrated slot-waveguide ring resonator refractive index sensor array

Kristinn B. Gylfason, Carl Fredrik Carlborg, Andrzej Kaźmierczak, Fabian Dortu, Hans Sohlström, Laurent Vivien, Carlos A. Barrios, Wouter van der Wijngaart, and Göran Stemme  »View Author Affiliations

Optics Express, Vol. 18, Issue 4, pp. 3226-3237 (2010)

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We present an experimental study of an integrated slot-waveguide refractive index sensor array fabricated in silicon nitride on silica. We study the temperature dependence of the slot-waveguide ring resonator sensors and find that they show a low temperature dependence of −16.6 pm/K, while at the same time a large refractive index sensitivity of 240 nm per refractive index unit. Furthermore, by using on-chip temperature referencing, a differential temperature sensitivity of only 0.3 pm/K is obtained, without individual sensor calibration. This low value indicates good sensor-to-sensor repeatability, thus enabling use in highly parallel chemical assays. We demonstrate refractive index measurements during temperature drift and show a detection limit of 8.8 × 10−6 refractive index units in a 7 K temperature operating window, without external temperature control. Finally, we suggest the possibility of athermal slot-waveguide sensor design.

© 2010 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(130.6010) Integrated optics : Sensors
(230.5750) Optical devices : Resonators

ToC Category:
Integrated Optics

Original Manuscript: October 20, 2009
Revised Manuscript: January 20, 2010
Manuscript Accepted: January 29, 2010
Published: February 1, 2010

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

Kristinn B. Gylfason, Carl F. Carlborg, Andrzej Kazmierczak, Fabian Dortu, Hans Sohlström, Laurent Vivien, Carlos A. Barrios, Wouter van der Wijngaart, and Göran Stemme, "On-chip temperature compensation in an integrated slot-waveguide ring resonator refractive index sensor array," Opt. Express 18, 3226-3237 (2010)

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