Department of Electronics, Carleton University, 1125 Colonel By Drive, Ottawa, Canada.
Nanotechnology. 2012 Nov 9;23(44):444012. doi: 10.1088/0957-4484/23/44/444012. Epub 2012 Oct 18.
A novel technique for increasing the sensitivity of tilted fibre Bragg grating (TFBG) based refractometers is presented. The TFBG sensor was coated with chemically synthesized silver nanowires ~100 nm in diameter and several micrometres in length. A 3.5-fold increase in sensor sensitivity was obtained relative to the uncoated TFBG sensor. This increase is associated with the excitation of surface plasmons by orthogonally polarized fibre cladding modes at wavelengths near 1.5 μm. Refractometric information is extracted from the sensor via the strong polarization dependence of the grating resonances using a Jones matrix analysis of the transmission spectrum of the fibre.
提出了一种提高倾斜光纤布拉格光栅（TFBG）折射率传感器灵敏度的新方法。在 TFBG 传感器上涂覆了直径约 100nm、长度为数微米的化学合成银纳米线。与未涂覆 TFBG 传感器相比，传感器的灵敏度提高了 3.5 倍。这种增加与在近 1.5μm 波长处正交偏振光纤包层模式激发表面等离激元有关。通过使用光纤传输谱的琼斯矩阵分析，从传感器中提取折射信息，该分析利用了光栅共振的强烈偏振依赖性。
