论文标题
基于双共振的超高敏感表面等离子共振传感器
Ultra-high Sensitive Surface Plasmon Resonance Based Sensor with Dual Resonance
论文作者
论文摘要
我们表明，对于优化的入射角，基于SPR的光传感器在近红外区域表现出双重共振，传感器变得异常高敏感。两种共振均与环境折射率相反，将差异移位增加了许多折叠。还使用模态分析和相匹配条件来解释双共振和相反光谱偏移背后的物理原因。双重共振的存在非常容易受到入射角的影响，这促进了传感器在从气体样本到生物学标本的范围内工作，分别为460 um/riU和290 um/riU。所考虑的传感器在不改变其几何参数的情况下检测生物化学物质和气体的前景更广泛。
We show that for the optimized angle of incidence, the SPR based optical sensors exhibit dual resonance in the near-infrared region around which the sensor becomes exceptionally high sensitive. Both the resonances show opposite spectral shift with an ambient refractive index, increasing the differential shift by many folds. The physical reason behind the dual resonance and opposite spectral shifts are also explained using the modal analysis and the phase-matching condition. The presence of dual resonance is highly susceptible to the angle of incidence, which facilitates the sensors to work in a wide range from gaseous specimen to biological ones with extremely high sensitivity of 460 um/RIU and 290 um/RIU, respectively. The considered sensor has broader prospects for the detection of bio-chemicals and gases without changing its geometrical parameters.
