Tahmasebpour M, Bahrami M, Asgari A
Appl Opt. 2014 Sep 20;53(27):6307-16. doi: 10.1364/AO.53.006307.
A metallic subwavelength grating structure built on a thin gold film is studied for surface plasmon resonance (SPR) detection of refractive index variations of biological buffer solutions. By employing finite element analysis as a numerical method, characteristics of the angle interrogated SPR sensor were calculated and discussed in a broad operating wavelength varying from visible to near-infrared (NIR). The effects of grating structural parameters such as grating depth, grating period, and grating fill factor in different operating wavelengths have been evaluated on the sensor performance parameters of sensitivity, full width at half-minimum, minimum reflectance at resonance, and resonance angle. Numerical results indicate that adjusting grating geometrical parameters can enhance the performance parameters of the sensor especially in the NIR wavelengths. The enhanced sensor performance parameters for optimizing grating geometry have been explored in detail for visible and NIR wavelengths of 633 and 984 nm, respectively. These findings are important for developing localized surface plasmon sensors with enhanced performance.
研究了一种基于薄金膜构建的金属亚波长光栅结构，用于生物缓冲溶液折射率变化的表面等离子体共振（SPR）检测。通过采用有限元分析作为数值方法，在从可见光到近红外（NIR）的宽工作波长范围内计算并讨论了角度询问SPR传感器的特性。评估了不同工作波长下光栅深度、光栅周期和光栅填充因子等光栅结构参数对传感器性能参数（灵敏度、半高宽、共振时的最小反射率和共振角）的影响。数值结果表明，调整光栅几何参数可以提高传感器的性能参数，特别是在近红外波长范围内。分别针对633和984 nm的可见光和近红外波长，详细探讨了优化光栅几何结构时增强的传感器性能参数。这些发现对于开发性能增强的局域表面等离子体传感器具有重要意义。
