Key laboratory of Opto-electronic Information and Technology, Ministry of Education and Institute of Modern Optics, Nankai University, Tianjin 300071, China.
Opt Lett. 2010 Jun 15;35(12):2061-3. doi: 10.1364/OL.35.002061.
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.
我们提出并演示了一种基于光子晶体光纤（PCF）的折射率传感器，该传感器通过在弯曲控制的填充液体光子带隙光纤（FF-PBGF）中引入避免交叉效应来实现。通过控制 FF-PBGF 的弯曲半径，可以实现基模与包层模之间的共振耦合，并在 FF-PBGF 的传输带中观察到传输陷波。通过改变弯曲 FF-PBGF 的折射率或温度，可以实现 32400nm/RIU（或 13.1nm/°C）的超高灵敏度，这是迄今为止光纤器件中的最高值。
