Abstract
We present a liquid refractive index (RI) sensor based on step-index
multimode polymer optical fiber with a micro-hole drilled by the femtosecond laser.
The experimental results show that in the RI operation range of 1.333-1.473, the
sensor has a good linear loss (dB) response to the liquid RI in the micro-holes and
a high sensitivity of 18 dB/RIU approximately. The experimental results are
explained with the mode of the refraction loss caused by the hole-core interface and
connection loss caused by the gap of the holes. The sensor has many advantages
including high sensitivity and low cost.
© 2014 Chinese Optics Letters
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