Avoided-crossing-based ultrasensitive photonic crystal fiber refractive index sensor

作者：Han, Tingting; Liu, Yan-ge^*; Wang, Zhi; Zou, Bing; Tai, Boyin; Liu, Bo

来源：Optics Letters, 2010, 35(12): 2061-2063.

DOI：10.1364/OL.35.002061

• BANDGAP FIBERS

We propose and demonstrate an ultrasensitive photonic crystal fiber refractive index sensor by introducing the avoided-crossing effect in a bent-controlled fluid-filled photonic-bandgap fiber (FF-PBGF). By controlling the bend radius of the FF-PBGF, resonant couplings between the fundamental core mode and the cladding modes are realized and transmission notches are observed in the transmission band of the FF-PBGF. By changing the refractive index or temperature of the bent FF-PBGF, a sensitivity of 32,400 nm per refractive index unit (or 13.1 nm/degrees C) is achieved, which is the highest for a fiber device to date, to our best knowledge.

• 出版日期2010-6-15
• 单位南开大学