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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 21 — Oct. 17, 2007
  • pp: 13649–13650

Surface plasmon interferometer in silicon-on-insulator: novel concept for an integrated biosensor: Comment

R. Levy and S. Ruschin  »View Author Affiliations


Optics Express, Vol. 15, Issue 21, pp. 13649-13650 (2007)
http://dx.doi.org/10.1364/OE.15.013649


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Abstract

We discuss inaccuracies associated with neglecting radiation modes in the calculation of waveguide mode propagation and sensitivity in “Surface plasmon interferometer in silicon-on-insulator: novel concept for an integrated biosensor” [Opt. Express 14, 7063-7072 (2006)]. Numeric calculation shows that due to the short length of the proposed waveguide structure, radiation modes cannot be ignored. When radiation modes are added to the calculation, sensitivity values decrease from above 10,000 dB/RIU to below 1000 dB/RIU. The influence of the radiation modes in such a short structure is due to the recapture of optical power from radiation modes by the output guide, thus reducing the contrast in the interference and the sensitivity.

© 2007 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Integrated Optics

History
Original Manuscript: June 25, 2007
Revised Manuscript: August 1, 2007
Manuscript Accepted: July 29, 2007
Published: October 4, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

Citation
R. Levy and S. Ruschin, "Surface plasmon interferometer in silicon-on-insulator: novel concept for an integrated biosensor: Comment," Opt. Express 15, 13649-13650 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-21-13649


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References

  1. P. Debackere, S. Scheerlinck, P. Bienstman, and R. Baets, "Surface plasmon interferometer in silicon-on-insulator: novel concept for an integrated biosensor," Opt. Express 14, 7063-7072 (2006). [CrossRef] [PubMed]
  2. R. Levy and S. Ruschin, "SPR waveguide sensor based on transition of modes at abrupt discontinuity," Sens. Actuators B  124, 459-465 (2007). [CrossRef]
  3. R. Levy and S. Ruschin, "SPR waveguide sensor based on combined sensing of phase and amplitude changes," Proc. SPIE 6475, 6475OR (2007). [CrossRef]
  4. J. Ctyroky, J. Homola, P. V. Lambeck, S. Musa, H. J. W. M. Koekstra, R. D. Harrris, J. S. Wilkinson, B. Usievich, and N. M. Lyndin, "Theory and modeling of optical waveguide sensors utilizing surface plasmon resonance," Sens. Actuators B 54, 66-73 (1999). [CrossRef]
  5. J. Ctyrokyâ, J. Homola, and M. Skalskyâ, "Modelling of surface plasmon resonance waveguide sensor by complex mode expansion and propagation method," Opt. Quantum Electron. 29, 301-311 (1997) [CrossRef]

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