Antiresonant guiding fibers and waveguides for biological and distributed sensing applications
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In our current work, we propose, design and experimentally demonstrate a novel, simple, distributed refractometric sensor based on unique spectral properties of antiresonant-guiding photonic crystal fibers for measuring temperature gradients. The sensor can measure accurately the temperature gradient irrespective of its profile. Both simulation and experimental results are illustrated in this work. In the second phase, we propose a novel optofluidic biosensor in which detection is based on a shift in the transmission spectrum due to the contrast in refractive index between the carrier fluid and the target biomaterial. The sensor can function using free-space illumination without the need for fiber or waveguide coupled input/output signals. Our analysis demonstrates that the spectral shift is linearly proportional to the difference in refractive index between the carrier fluid and the biomaterial. We show that the transmission minima and detection sensitivity can be estimated using an analytical expression based on a 1D photonic bandgap analysis. Detectible shifts in the transmission spectra can be achieved with nanoscale accumulation of biomaterial within the sensor.