Comparison of sensitivity of optical waveguide chemical sensors between TM and TE modes

DeKui Qing; Ichirou Yamaguchi

doi:10.1117/12.347731

7 May 1999 Comparison of sensitivity of optical waveguide chemical sensors between TM and TE modes

DeKui Qing, Ichirou Yamaguchi

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347731
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

To investigate the dependence of the sensitivity of optical waveguide sensors on the polarization of guided modes, we have analyzed their absorption coefficients for both TE and TM modes by group index method [D.-K. Qing, X-. M. Chen, K. Itoh, M. Murabayashi: J. Lightwave Technol. 14, pp. 1907-1917, 1996]. As field distributions of TE and TM modes are different, the absorption coefficient for TE and TM modes are different. For open clad type evanescent wave sensors, whose mode is more favorable depends on whether the refractive index of the measurand is lower or higher than that of the substrate; for buffered clad type evanescent wave sensors, This depends on the role of the buffer layer; for sensing layer type evanescent wave sensors, TE mode has larger sensitivity than TM mode; for guided wave sensors, both TE and TM mode are suitable for highly sensitive sensors.

Citation Download Citation

DeKui Qing and Ichirou Yamaguchi "Comparison of sensitivity of optical waveguide chemical sensors between TM and TE modes", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347731

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