Title :
Palladium-Coated Silica Microfiber Knots for Enhanced Hydrogen Sensing
Author :
Xi Wu ; Fuxing Gu ; Heping Zeng
Author_Institution :
Shanghai Key Lab. of Modern Opt. Syst., Univ. of Shanghai for Sci. & Technol., Shanghai, China
Abstract :
Pd-coated microfiber knot resonators (MKR) are fabricated for hydrogen sensing by measuring the shift and absorption at the resonant wavelengths of the microfiber knots. Compared with existing fiber-optic hydrogen sensors, the Pd-coated MKRs exhibit enhanced sensitivity using small interaction lengths, because the recirculation of resonant light within the MKRs significantly accumulate the hydrogen-Pd interaction. It is found that microfiber diameter of the knot is a critical factor to achieve high sensitivity.
Keywords :
antireflection coatings; chemical sensors; fibre optic sensors; hydrogen; optical fibre fabrication; optical resonators; palladium; silicon compounds; H2; Pd-SiO2; Pd-coated microfiber knot resonators; fiber-optic hydrogen sensors; hydrogen-Pd interaction; interaction lengths; microfiber diameter; palladium-coated silica microfiber knots; resonant light recirculation; resonant wavelength absorption; resonant wavelength shift; sensitivity; Hydrogen; Optical fiber sensors; Optical fibers; Optical resonators; Sensitivity; Microfiber knots; hydrogen sensors; interferometers; microfiber knots; palladium;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2415191
