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IEEE Journal of Lightwave Technology
Volume 18 Number 5, May 2000

Table of Contents for this issue

Complete paper in PDF format

Sensitivity Enhancement in Evanescent Optical Waveguide Sensors

G. J. Veldhuis, O. Parriaux, H. J. W. M. Hoekstra and P. V. Lambeck

Page 677.

Abstract:

It is shown, that the sensitivity of the effective refractive index on the cladding index in evanescent optical waveguide sensors, can be larger than unity. This implies that the attenuation of a guided wave propagating in a waveguide immersed in an absorptive medium can be made larger than that of a free-space wave propagating through the same medium. The conditions and physical explanation for this puzzling behavior are identified and as a practical application, an absorption sensor, based on a suspended silicon slab waveguide,is proposed where the sensitivity is enhanced by a factor of 1.35.

References

  1. R. G. Heideman, G. J. Veldhuis, E. W. H. Jager and P. V. Lambeck, "Fabrication and packaging of integrated chemo-optical sensors", Sensors Actuators, vol. B35-36, pp.  234-240, 1996.
  2. B. J. Luff, J. S. Wilkinson, J. Piehler, U. Hollenbach, J. Ingenhoff and N. Fabricius, "Integrated optial Mach-Zehnder biosensor", J. Lightwave Technol., vol. 16, pp.  583-592, 1998.
  3. A. Bernard and H. R. Bosshard, "Real-time monitoring of antigen-antibody recognition on a metal oxide surface by an optical grating coupler sensor", Eur. J. Biochem., vol. 230, pp.  416-423, 1995.
  4. K. Tiefenthaler and W. Lukosz, "Sensitivity of grating couplers as integrated-optical chemical sensors", J. Opt. Soc. Amer. B, vol. 6, pp.  209-220, 1989.
  5. G. J. Veldhuis, J. H. Berends, R. G. Heideman and P. V. Lambeck, "An integrated optical Bragg-reflector used as chemo-optical sensor", Pure Appl. Opt., pp.  L23-L26, 1998.
  6. G. J. Veldhuis and P. V. Lambeck, "Highly-sensitive passive integrated optical spiral-shaped waveguide refractometer", Appl. Phys. Lett., vol. 71, pp.  2895-2897,  1997.
  7. A. Bradenburg and R. Edelhäuser, "Integrated optical gas sensors using organically modified silicates as sensitive films", Sensors Actuators B, vol. 11, pp.  361-374, 1993.
  8. O. Parriaux and G. J. Veldhuis, "Normalized analysis for the sensitivity optimization of integrated optical evanescent wave sensors", J. Lightwave Technol., vol. 16, pp.  573-582, 1998.
  9. K. Chan, H. Ito and H. Inaba, "An optical-fiber-based gas sensor for remote absorption measurement of low-level CH4 gas in the near-infrared region", J. Lightwave Technol., vol. LT-2, pp.  234-237, 1984.
  10. H. Kogelnik and T. Tamir, Topics in Applied Physics, New York: Springer-Verlag, 1975,vol. 7,ch. 2.
  11. Enschede The Netherlands:
  12. L. I. Schiff, Quantum Mechanics, New York: McGraw-Hill, 1955, ch. 7, pp.  151 -155.