Local plasmatic resonance existing around nanoscale metallic structures is closely related to the refractive index of the surrounding media. Gold Lamellae layers embedded in gratings are ideal to populate the plasmatic resonances locally with much higher concentration than the simple gratings, leading to enhanced sensitivity to the testing materials. Based on our earlier success in replicating dielectric lamellae layers, this paper reports our further work in converting the dielectric lamellae layers into gold ones and the study of their optical property as refractive index sensors. To prove the local surface plasmatic resonance be responsible for absorbing the light, the gratings without the lamellae layer were also tested for comparison. Both numerical simulation using the finite difference time domain method and optical measurements have demonstrated the enhanced sensitivity by the gratings with lamellae layers, although structural optimization is still needed. With the furth...

中文翻译：

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带有和不带有薄片层的光栅光学传感特性的比较研究

存在于纳米级金属结构周围的局部等离子体共振与周围介质的折射率密切相关。嵌入光栅中的金薄片层是局部填充等离子体共振的理想选择，其浓度要比简单光栅高得多，从而提高了对测试材料的敏感性。基于我们在复制介电薄片层方面取得的较早成功，本文报道了我们在将介电薄片层转换为金膜层以及作为折射率传感器的光学性能方面进行的进一步研究。为了证明局部表面等离子体共振负责吸收光，还对没有薄片层的光栅进行了比较测试。使用有限差分时域方法进行的数值模拟和光学测量均表明，尽管仍需要进行结构优化，但具有薄层的光栅具有更高的灵敏度。随着...