论文标题
基于磁等离子体在简单的金属深纳米根阵列中基于磁等离子体的高灵敏度折射率传感的实验证明
Experimental demonstration of high sensitivity refractive index sensing based on magnetic plasmons in a simple metallic deep nanogroove array
论文作者
论文摘要
实验构造和证明了具有高纵横比的高性能广角折射率传感器，具有高纵横比的简单（1D）金属深纳米元素阵列。磁等离子体（MP）的激发表现出1D深凹槽阵列，指的是入射电磁波的有效耦合，在深凹槽内引起了强烈的磁反应。利用对周围介电介质极为敏感的MP共振，我们成功地实现了高达$ \ sim $ 1300 nm/riU的折射率敏感性（RIS），该折射率比大多数实验设计的等离子传感器高的红外线区域中高。重要的是，从无关的MP共振受益于深处凹槽内部磁场的强烈限制和在凹槽开口处的强电场定位，我们展示了在宽带红外区域有效的广角传感能力，其线性依赖于折射率的变化，其线性依赖于极好的线性。这样的基于MP的传感器，以及其简单的一维平坦性质和易于制造的易用性，具有实践设计高灵敏，成本效益和紧凑的传感设备的巨大潜力。
A high-performance wide-angle refractive index sensor based on a simple onedimensional (1D) metallic deep nanogroove array with high aspect ratio is experimentally fabricated and demonstrated. The 1D deep groove array is featured by the excitation of magnetic plasmon (MP), referring to an effective coupling of incident electromagnetic waves with a strong magnetic response induced inside the deep grooves. Utilizing the MP resonances that are extremely sensitive to the surrounding dielectric medium, we successfully achieve a refractive index sensitivity (RIS) up to $\sim$1300 nm/RIU, which is higher than that of most experimentally designed plasmonic sensors in infrared region. Importantly, benefiting from angle-independent MP resonances with strong confinement of magnetic field inside the deep grooves and strong electric field localization at the groove openings, we demonstrate wide-angle sensing capability valid in a broadband infrared region with an excellent linear dependence on the change of refractive index. Such a MP-based sensor, together with its simple 1D flat nature and ease of fabrication, has great potential for practical design of high sensitive, cost-effective and compact sensing devices.
