Abstract
A photonic crystal fiber sensor is created by infiltrating liquid with
higher refractive index than background silica into two adjacent air holes
situated in different layers. When the refractive index of the liquid is decreased
to that of silica by heating, the two liquid rods and the solid core form
a three-parallel-waveguide structure, which enables efficient mode energy
coupling between the two eigenmodes and results in an interference fringe
pattern. Theoretical analysis has been carried out to reveal the modes involved
in the interference. Moreover, the temporal stability of the device is enhanced
by inserting short sections of ultraviolet curable glue at both ends of the
liquid, followed by solidification, to prevent the liquid–air interface
fluctuation. The temperature sensitivity achieved is ~-8.8$ nm/°C, in the range between 45 and
50 °C.
© 2012 IEEE
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