Caucheteur Christophe, Shevchenko Yanina, Shao Li-Yang, Wuilpart Marc, Albert Jacques
Electromagnetism and Telecom Unit, Université de Mons, Mons, Belgium.
Opt Express. 2011 Jan 17;19(2):1656-64. doi: 10.1364/OE.19.001656.
The generation of surface plasmon resonances (SPRs) in gold-coated weakly tilted fiber Bragg gratings (TFBGs) strongly depends on the state of polarization of the core guided light. Recently, it was demonstrated that rotating the linear state of polarization of the guided light by 90° with respect to the grating tilt allows to turn the SPR on and off. In this work, we measure the Jones matrix associated to the TFBG transmission properties in order to be able to analyze different polarization-related parameters (i.e. dependency on wavelength of polarization dependent loss and first Stokes parameter). As they contain the information about the SPR, they can be used as a robust and accurate demodulation technique for refractometry purposes. Unlike other methods reported so far, a tight control of the input state of polarization is not required. The maximum error on refractive index measurement has been determined to be ~1 10(-5) refractive index unit (RIU), 5 times better than intensity-based measurements on the same sensors.
在镀金的弱倾斜光纤布拉格光栅（TFBG）中表面等离子体共振（SPR）的产生强烈依赖于纤芯导光的偏振态。最近，有研究表明，将导光的线性偏振态相对于光栅倾斜旋转90°，可以开启和关闭SPR。在这项工作中，我们测量与TFBG传输特性相关的琼斯矩阵，以便能够分析不同的偏振相关参数（即偏振相关损耗和第一斯托克斯参数对波长的依赖性）。由于它们包含有关SPR的信息，因此可以用作一种强大而准确的用于折射测量目的的解调技术。与迄今为止报道的其他方法不同，该方法不需要严格控制输入偏振态。已确定折射率测量的最大误差约为1×10⁻⁵折射率单位（RIU），比在相同传感器上基于强度的测量结果好5倍。
