Kim Yoon-Chang, Masson Jean-Francois, Booksh Karl S
Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA.
Talanta. 2005 Oct 31;67(5):908-17. doi: 10.1016/j.talanta.2005.04.022. Epub 2005 Aug 24.
Single-crystal sapphire-fiber optic sensors based on surface plasmon resonance (SPR) for refractive index (RI) measurements of aqueous and hydrothermal water solutions are described. Accurate measurement of RIs is essential to efficient operation and control of broad range of engineering processes. Some of these processes are carried out with harsh environments, such as high-temperature, high pressure, and chemical corrosion. These extreme physical conditions are proving a limiting factor in application of the conventional silica-based optical sensors. Single-crystal sapphire is an ideal material for sensor applications, where reliable performance is required in the extreme environment conditions. With regard to the liquid species detection, most applications of SPR sensors are designed to function near the refractive index of water (1.3330RI). The RI changes of aqueous solution can be easily monitored by silica-fiber (RI, 1.4601 at 550nm) based SPR sensor. However, the sapphire waveguide has a prohibitively high RI (1.7708 at 546nm) for unmodified monitoring of the RI changes of aqueous solutions. For that purpose, a practical SPR probe geometry has been applied to the ability to tune the SPR coupling wavelength/angle pair with sapphire-fiber based SPR probe.
描述了基于表面等离子体共振（SPR）的单晶蓝宝石光纤传感器，用于测量水溶液和热液水溶液的折射率（RI）。准确测量折射率对于广泛的工程过程的高效运行和控制至关重要。其中一些过程是在恶劣环境下进行的，如高温、高压和化学腐蚀。这些极端的物理条件正成为传统硅基光学传感器应用的限制因素。单晶蓝宝石是传感器应用的理想材料，在极端环境条件下需要可靠的性能。关于液体种类检测，SPR传感器的大多数应用设计为在水的折射率（1.3330RI）附近起作用。基于二氧化硅光纤（550nm处的RI为1.4601）的SPR传感器可以轻松监测水溶液的RI变化。然而，蓝宝石波导的折射率过高（546nm处为1.7708），无法直接监测水溶液的RI变化。为此，一种实用的SPR探头几何结构已应用于基于蓝宝石光纤的SPR探头调谐SPR耦合波长/角度对的能力。
