Zhang Xingwang, Zhou Guangya, Shi Peng, Du Han, Lin Tong, Teng Jinghua, Chau Fook Siong
Opt Lett. 2016 Mar 15;41(6):1197-200. doi: 10.1364/OL.41.001197.
Complex refractive index sensing is proposed and experimentally demonstrated in optofluidic sensors based on silicon photonic crystal nanobeam cavities. The sensitivities are 58 and 139 nm/RIU, respectively, for the real part (n) and the imaginary part (κ) of the complex refractive index, and the corresponding detection limits are 1.8×10(-5) RIU for n and 4.1×10(-6) RIU for κ. Moreover, the capability of the complex refractive index sensing method to detect the concentration composition of the ternary mixture is demonstrated without the surface immobilization of functional groups, which is impossible to realize with the conventional refractive index sensing scheme.
在基于硅光子晶体纳米光束腔的光流体传感器中提出并通过实验证明了复折射率传感。对于复折射率的实部（n）和虚部（κ），灵敏度分别为58和139 nm/RIU，并且对于n的相应检测限为1.8×10^(-5) RIU，对于κ为4.1×10^(-6) RIU。此外，展示了复折射率传感方法在不进行官能团表面固定的情况下检测三元混合物浓度组成的能力，这是传统折射率传感方案无法实现的。
