论文标题
通过薄金属膜上的高K等离子来增强后坐力光学力
Enhancement of recoil optical forces via high-k plasmons on thin metallic films
论文作者
论文摘要
在表面或波导附近发射器上作用的后坐力光学依赖于近场的方向性和动量的保护。它具有光学力中不常见的理想特性，例如通过大量颗粒的广泛照明能力而无需聚焦，或通过光的极化动态切换。不幸的是，这些后坐力通常非常弱，并且在小的偶极颗粒中未被实验观察到。从理论上讲，一些作品通过涉及双曲表面或超材料的复杂纳米结构来证明这些力对这些力的增强，从而使制造和实验性演示变得复杂。在这项工作中，我们通过简单地使用薄金属膜，从理论和数字上显示出侧后座力的增强，从而支持超高的摩肌等离子模式。这些模式所携带的高摩肌在偶极子上赋予了相应的大型后坐力，在非常简单的几何形状中通过几个数量级增强了力，使其更接近实际应用。
The recoil optical force that acts on emitters near a surface or waveguide relies on near-field directionality and conservation of momentum. It features desirable properties uncommon in optical forces, such as the ability to produce it via wide-area illumination of vast numbers of particles without the need for focusing, or being dynamically switchable via the polarization of light. Unfortunately, these recoil forces are usually very weak and have not been experimentally observed in small dipolar particles. Some works theoretically demonstrate orders-of-magnitude enhancement of these forces via complex nano-structuring involving hyperbolic surfaces or metamaterials, complicating the fabrication and experimental demonstration. In this work, we theoretically and numerically show enhancement of the lateral recoil force by simply using thin metallic films, which support ultra-high-momentum plasmonic modes. The high-momentum carried by these modes impart a correspondingly large recoil force on the dipole, enhancing the force by several orders of magnitude in a remarkably simple geometry, bringing it closer to practical applications.
