College of Optoelectronics Engineering, Key Laboratory of Optoelectronic Devices and Systems, Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China.
Opt Lett. 2013 May 1;38(9):1370-2. doi: 10.1364/OL.38.001370.
A wavelength-multiplexing phase-sensitive surface plasmon resonance (SPR) imaging sensor offering wide dynamic detection range and microarray capability is reported. Phase detection is accomplished by performing self-interference between the s- and p- polarizations within the signal beam. A liquid crystal tunable filter is used to sequentially select the SPR excitation wavelength from a white light source. This wavelength-multiplexing approach enables fast detection of the sensor's SPR phase response over a wide range of wavelengths, thereby covering literally any regions of interest within the SPR dip and thus maintaining the highest sensitivity point at all times. The phase-sensitive approach is particularly important for imaging SPR sensing applications because of its less stringent requirements for intensity signal-to-noise ratio, which also means the possibility of using uncooled modest resolution analog-to-digital conversion imaging devices. Experimental results demonstrate a resolution of 2.7×10(-7) RIU with a dynamic range of 0.0138 RIU.
一种波长复用相敏表面等离子体共振（SPR）成像传感器，具有宽动态检测范围和微阵列功能，被报道。通过在信号光束内实现 s 偏振和 p 偏振之间的自干涉来完成相位检测。液晶可调谐滤波器用于从白光光源中顺序选择 SPR 激发波长。这种波长复用方法能够在宽波长范围内快速检测传感器的 SPR 相位响应，从而覆盖 SPR 下降中的任何感兴趣区域，从而始终保持最高灵敏度点。相敏方法对于成像 SPR 传感应用非常重要，因为它对强度信号噪声比的要求较低，这也意味着可以使用非制冷的中等分辨率模拟到数字转换成像设备。实验结果表明，分辨率为 2.7×10(-7) RIU，动态范围为 0.0138 RIU。
