Abstract

We obtain lossy mode resonances by the coupling of light from a multimode optical waveguide to a $\mathrm{Ti}{\mathrm{O}}_2/\mathrm{PSS}$ coating deposited with the layer-by-layer method. The resonances can be generated in a wide wavelength range from the ultraviolet to the infrared region of the optical spectrum. The transmission spectrum is monitored as a function of the number of bilayers deposited, and the experimental results agree with the theoretical predictions. Moreover, each of the resonances owns a particular sensitivity to the external refractive index. This permits us to use the sensor as a refractometer with multiple- wavelength monitorization.

© 2010 Optical Society of America

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