title: Semicircular fiber-based high-sensitivity displacement sensor.
abstract: A semicircular fiber (SCF) was fabricated by flame-heated treatment for displacement sensing application. By launching a laser beam into the SCF, interference was created at the output port of the structure due to fiber-bending-induced birefringence. Experiments indicate that the resonant wavelength was shifted to shorter wavelengths with increasing transverse displacement. Displacement sensitivity increases with the decrease of the bending radius of the SCF. A high sensitivity of 1100 nm/mm was obtained for the SCF with a bending radius of 0.57 mm.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Baojun
authors.initials: B
authors.lastname: Li