Martínez Javier, Ródenas Airán, Aguiló Magdalena, Fernandez Toney, Solis Javier, Díaz Francesc
Opt Lett. 2016 Jun 1;41(11):2493-6. doi: 10.1364/OL.41.002493.
A novel fiber-coupled indium tin oxide (ITO) coated glass slide sensor for performing surface plasmon polariton chemical monitoring in the ∼3.5 μm mid-infrared (IR) range is reported. Efficient mid-IR fiber coupling is achieved with 3D laser written waveguides, and the coupling of glass waveguide modes to ITO surface plasmon polaritons (SPPs) is driven by the varying phase matching conditions of different aqueous analytes across the anomalous dispersion range determined by their molecular fingerprints. By means of using both a mid-IR fiber supercontinuum source and a diode laser, the excitation of SPPs is demonstrated. The sensor sensitivity is tested by discriminating CH from OH features of ethanol in water solutions, demonstrating an instrumental ethanol limit of detection of 0.02% in a wide concentration range of at least 0%-50%. The efficient optical monitoring of mid-IR SPPs in smart glass could have a broad range of applications in biological and chemical sensing.
报道了一种新型的光纤耦合氧化铟锡（ITO）涂层玻璃载玻片传感器，用于在约3.5微米的中红外（IR）范围内进行表面等离激元极化子化学监测。利用三维激光写入波导实现了高效的中红外光纤耦合，并且玻璃波导模式与ITO表面等离激元极化子（SPP）的耦合是由不同水性分析物在其分子指纹所确定的反常色散范围内变化的相位匹配条件驱动的。通过使用中红外光纤超连续谱源和二极管激光器，演示了SPP的激发。通过区分水溶液中乙醇的CH和OH特征来测试传感器的灵敏度，结果表明在至少0%-50%的宽浓度范围内仪器对乙醇的检测限为0.02%。智能玻璃中对中红外SPP的高效光学监测在生物和化学传感方面可能有广泛的应用。
