Abstract
We present a brief review of our recent works on refractive index sensors based on highly birefringent microfibers. Microfibers with birefringence in the order of 10−2 have been fabricated by heating and tapering the rectangular or elliptic cladding raw fibers. Ultra-sensitive refractive index sensor with sensitivity as high as 195,348 nm/RI around RI=1.35887 has been implemented by inserting the microfiber into a Sagnac loop. Application for relative humidity sensing has been also demonstrated.
© 2014 Optical Society of America
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