Abstract
A highly sensitive integrated optical biosensor based on the cascade of a
Fabry–Perot cavity laser and a microring resonator is investigated theoretically and
experimentally. The free spectral ranges of the microring and the laser cavity are
designed to be about the same in order to apply intensity interrogation. The variation
of the refractive index of the fluidic sample results in a large shift in the envelope
function of the total transmission spectrum of the sensor, and consequently, a large
change in the transmitted power. The simple light-source-integrated sensing scheme
achieved a high sensitivity of 1000 dB/RIU in the preliminary experiment, demonstrating
its principle and potential for low-cost practical applications.
© 2012 IEEE
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