Lateral recoil optical forces on nanoparticles near nonreciprocal surfaces
Lateral recoil optical forces on nanoparticles near nonreciprocal surfaces
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DOI：
10.1103/physrevb.107.035417
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发表时间：
2022-03
影响因子：
3.7
通讯作者：
N. K. Paul;J. S. Gómez-Díaz
中科院分区：
文献类型：
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作者：
N. K. Paul;J. S. Gómez-Díaz
我们研究了施加在纳米粒子上的横向反冲力，这些纳米粒子位于等离子体平台附近，具有面内非互易响应。为了这个目的，我们首先开发了一个全面的理论框架的基础上结合非互易绿色的功能，然后推导出近似的解析表达式来模拟横向反冲力的瑞利近似内的洛伦兹力，展示其明确的依赖于系统的色散关系，并揭示了管理它们的机制。特别是，一个占主导地位的横向反冲力分量出现由于平台支持的非互易表面等离子体的动量不平衡。该力可以比其他反冲力分量大几个数量级，仅沿着或逆着外部偏置的方向作用，并且与入射平面波的方向、偏振和波长准独立。使用漂移偏置的石墨烯超颖表面，一个平台，也提出了排序纳米粒子作为其大小的函数，探讨了横向反冲力。非互易等离子体系统可以使新的场所捕获，绑定和操纵纳米粒子，并减轻传统光镊的一些挑战。
: We investigate lateral recoil forces exerted on nanoparticles located near plasmonic platforms with in-plane nonreciprocal response. To this purpose, we first develop a comprehensive theoretical framework based on the Lorentz force within the Rayleigh approximation combined with nonreciprocal Green’s functions and then derive approximate analytical expressions to model lateral recoil forces, demonstrating their explicit dependence on the dispersion relation of the system and unveiling the mechanisms that govern them. In particular, a dominant lateral recoil force component appears due to the momentum imbalance of nonreciprocal surface plasmons supported by the platform. This force can be orders of magnitude larger than other recoil force components, acts only along or against the direction of the external bias, and is quasi-independent of the direction, polarization, and wavelength of the incident plane wave. Lateral recoil forces are explored using drift-biased graphene metasurfaces, a platform that is also proposed to sort nanoparticles as a function of their size. Nonreciprocal plasmonic systems may enable new venues to trap, bind, and manipulate nanoparticles and to alleviate some of the challenges of conventional optical tweezers.