Improvement of the sensitivity of the surface plasmon resonance sensors based on multi-layer modulation techniques
Improvement of the sensitivity of the surface plasmon resonance sensors based on multi-layer modulation techniques
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DOI：
10.1016/j.optcom.2014.09.001
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发表时间：
2015-01
影响因子：
2.4
通讯作者：
Xihong Zhao;Yu Chu-Su;W. Tsai;Ching-Ho Wang;Tsung-Liang Chuang;Chii-Wann Lin;Yu-Chia Tsao;Mu-Shiang Wu
中科院分区：
文献类型：
--
作者：
Xihong Zhao;Yu Chu-Su;W. Tsai;Ching-Ho Wang;Tsung-Liang Chuang;Chii-Wann Lin;Yu-Chia Tsao;Mu-Shiang Wu
本研究将多层调制技术应用于SPR光纤传感器中，通过调节SPR谐振波长来提高SPR光纤传感器的灵敏度。溅射过程在材料表面沉积20 nm的TiO 2、11 nm的SiO2和30 nm的金膜以改变折射率。在不考虑折射率溶液（1.32和1.36）的情况下，单层金薄膜和多层金薄膜调制的SPR光纤的波长解调灵敏度分别为1.08×10 - 5 RIU和1.74×10 - 6 RIU。结果表明，采用850 nm光源对SPR光纤传感器进行实时分析时，折射率为1.32和1.36的溶液之间的差异显著。单层金膜和多层调制的SPR光纤强度解调灵敏度分别为1.08×10 - 3RIU和1.73×10 - 4 RIU，表明多层调制技术可以提高SPR光纤传感器的灵敏度。该传感器结构紧凑，具有更宽的折射率检测范围和更高的灵敏度，在其他合适波长的生物分析中具有潜在的应用价值。
In this study, a multi-layer modulation technique was used in an SPR optical fiber sensor to enhance the sensitivity of the SPR optical fiber sensor by adjusting the SPR resonant wavelength. The sputtering process deposited 20 nm of TiO2, 11 nm of SiO2and 30 nm of gold film on the material surface to change the refractive index. Regardless of the different refractive index solutions (1.32 and 1.36), the sensitivities in wavelength interrogation of the SPR optical fiber with the single gold thin film and multi-layers modulation were 1.08×10−5RIUs and 1.74×10−6RIUs, respectively. The results showed the significant differences between the different refractive index solutions of 1.32 and 1.36 using the 850 nm light source to analyze the SPR optical fiber sensor in real-time. The sensitivities in intensity interrogation of the SPR optical fiber with the single gold thin film and multi-layers modulation were 1.08×10−3RIUs and 1.73×10−4RIUs, respectively, which indicated that the multi-layer modulation techniques could enhance the sensitivity of the SPR optical fiber sensor. The compact size of the multi-layer SPR fiber sensor had a wider detecting range of the refractive index and higher sensitivity, which had the potential for other applications in biological analysis with suitable wavelength.