Conclusions
In this chapter we have illustrated a new method for the determination of the refractive index of liquid samples, based on Cerenkov second harmonic generation from suitable planar waveguides. The method allows the determination of the refractive index in the near infrared by detection in the visible. Although the sensor proposed requires a nonlinear material, it can be fabricated by standard, rather simple techniques.
The same method can be exploited in an inverse way to obtain a full optical characterisation of second-order nonlinear waveguides, even if single-mode.
We have reported preliminary experimental results that demonstrate the reliability of the method described. Suitable waveguides will be designed for the refractometer proposed, with particular attention to sensitivity optimisation. Moreover, the possibility of full integration with a semiconductor laser will be considered. Indeed, waveguides, both linear and nonlinear, are likely to play a major role in sensor applications, and in particular in refractometry, especially in the prospect of fully integrated devices.
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Ramponi, R., Marangoni, M., Osellame, R. (2002). Optical Waveguide Refractometers. In: Martellucci, S., Chester, A.N., Mignani, A.G. (eds) Optical Sensors and Microsystems. Springer, Boston, MA. https://doi.org/10.1007/0-306-47099-3_4
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DOI: https://doi.org/10.1007/0-306-47099-3_4
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