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Light travels through the system via the cantilever that also acts as a waveguide and it is collected in the opposite side.
Different regions with their respective refractive indices that the light travels through.
When the medium between the cantilever waveguide and the output waveguide is water (or buffer solution) instead of air, the optical output is increased due to the reduced refractive index difference.
SEM image of two free-hanging cantilevers in the microfluidic channel.
(Color online) Comparison between calculated and measured values of the sensitivity. When operated in the most sensitive region, a cantilever deflection of can be resolved.
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