Title :
Nonadiabatically Tapered Microfiber Sensor With Ultrashort Waist
Author :
Wen Bin Ji ; Yung Chuen Tan ; Bo Lin ; Swee Chuan Tjin ; Kin Kee Chow
Author_Institution :
Dept. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
We investigated a nonadiabatically tapered microfiber refractive index sensor with an ultrashort waist length. Free spectral range (FSR) is one common issue in the interferometry-based sensors. Such sensors will not work properly once the resonant wavelengths shift over one cycle. It was found that the temperature and pulling speed are the crucial parameters to achieve a desired tapering profile. By setting a cooler tapering temperature and fast pulling speed, we successfully fabricated ultrashort microfibers with a waist length of only 2.4 mm and total length of 5.5 mm. The resulting FSR is ~80 nm and the maximum sensitivity achieved for such short microfiber is 25 667 nm/RIU.
Keywords :
fibre optic sensors; light interferometry; micro-optics; microsensors; optical fibre fabrication; refractive index; FSR; free spectral range; interferometry-based sensors; maximum sensitivity; nonadiabatically tapered microfiber refractive index sensor; pulling speed; resonant wavelengths; size 2.4 mm; size 5.5 mm; tapering profile; tapering temperature; ultrashort microfiber fabrication; ultrashort waist length; Fabrication; Optical fiber sensors; Optical fibers; Optical interferometry; Optimized production technology; Refractive index; Sensitivity; Optical fiber; microfiber; non-adiabatic; short taper;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2353931
