Key Laboratory of Artificial Micro- and Nano- structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan, China.
Opt Lett. 2011 Sep 1;36(17):3326-8. doi: 10.1364/OL.36.003326.
We experimentally report a magnetic plasmonic metamaterial, which is constructed with a metal ring-shaped disk array supported by a dielectric layer on a metal film for high sensitive refractive index sensing. An ultrasensitive refractive index sensitivity of about 1842 nm per refractive index unit is achieved through the reflection spectrum measurement. We attribute the high sensitivity to greatly enhanced electric field intensity and its large spatial overlapping with the surrounding medium to sense. The present plasmonic structure provides an effective way for high sensitive chip-based biochemical sensors and integrated devices.
我们通过实验报告了一种磁性等离子体超材料，它由一个金属环形盘阵列构成，该阵列由一个介质层支撑在金属薄膜上，用于高灵敏的折射率传感。通过反射光谱测量，实现了约 1842nm/RIU 的超高折射率灵敏度。我们将这种高灵敏度归因于大大增强的电场强度及其与周围介质的大空间重叠，从而实现了对折射率的感应。这种等离子体结构为高灵敏的基于芯片的生物化学传感器和集成器件提供了一种有效的方法。
