Sensitivity enhancement in evanescent optical waveguidesensors

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Veldhuis, G.J. and Parriaux, O. and Hoekstra, H.J.W.M. and Lambeck, P.V. (2000) Sensitivity enhancement in evanescent optical waveguidesensors. Journal of Lightwave Technology, 18 (5). pp. 677-682. ISSN 0733-8724

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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
Item Type:Article
Copyright:©2000 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/15214
Official URL:http://dx.doi.org/10.1109/50.842082
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