Fiber inline interferometric refractive index sensors fabricated by femtosecond laser and fusion spl

• 作 者: 于鹰宇 姜澜 李本业 曹志涛 王素梅
• 机 构: Nanomanufacturing Fundamental Research Joint Laboratory of National Science Foundation of China,Scho
• 出 处: Chinese Optics Letters
• 发表日期: 2013年11期
• 关键词: refractive splicing subsequent grating etching paired fabrication cladding reson

A fiber inline interferometric refractive index(RI) sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 μm are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to～361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is ～20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.

The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel The sensitivity in the RI range from 1.33 to 1.35 is up to ~ 361.29 nm / RIU at the microchannel width of 8 μm. The sensitivity is ~ 20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors.