Optical field and attractive force at the subwavelength slit.
Optical field and attractive force at the subwavelength slit.
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亚波长狭缝处的光场和吸引力。
DOI：
10.1364/oe.24.015972
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发表时间：
2016
期刊：
影响因子：
3.8
通讯作者：
V. Nesterov
中科院分区：
文献类型：
--
作者：
D. Shapiro;D. Nies;O. Belai;M. Wurm;V. Nesterov
在最近的工作中，预测了两块金属板之间存在一种新颖的光诱导吸引力。当横磁模式传播通过两个金属体之间的亚波长狭缝时，该力是由表面等离子体激元的相互作用产生的，表面等离子体激元在金属处被激发。在本文中，针对完美金属和黄金，对该磁场进行了分析和数值计算。找到了与波长相比的窄缝和宽缝的已知极限情况之间的幅度和相位瞬态曲线。由于新波导模式的出现，曲线出现振荡。完美金属的解析解与有限元法对金的计算结果一致。光诱导吸引力的简单渐近公式可以在窄缝的极限内找到。
In recent works, a novel light-induced attractive force was predicted between two metal plates. This force arises by the interaction of surface plasmons which are excited at the metal when a transverse magnetic mode propagates through a subwavelength slit between two metal bodies. In this paper, the analytical and numerical calculations of this magnetic field are presented for the perfect metal and for gold. The amplitude and the phase transient curves between the known limiting cases of narrow and wide slits compared to the wavelength are found. The curve is shown to oscillate due to the emergence of new waveguide modes. The analytic solution for the perfect metal is in agreement with the computation for gold by means of the finite element method. The simple asymptotic formula for the light-induced attractive force is found in the limit of a narrow slit.