"Near-field-induced optical force on a metal particle and C_<60>: Real-time and real-space electron dynamics simulation"
"Near-field-induced optical force on a metal particle and C_<60>: Real-time and real-space electron dynamics simulation"
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“金属粒子和 C_<60> 上的近场感应光力：实时和真实空间电子动力学模拟”
DOI：
10.1103/physreva.82.043411
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
T. Iwasa and K. Nobusada
中科院分区：
文献类型：
--
作者：
Ken-ichi Saitow;Tomoharu Yamamura;H. Kono;T. Iwasa and K. Nobusada
在实时和实空含时密度泛函理论的框架内，结合非均匀光-物质相互作用形式，充分考虑多极相互作用，计算了由近场诱导的1 mm大小的金属粒子的光力，并计算了其光场分布.高度局部化的近场使这些分子非均匀地极化。屏蔽电荷部分地抵消了分子中的局部感应极化电荷。极化和屏蔽电荷通常分别对吸引力和排斥力有贡献，并且这些电荷之间的合理平衡导致作为近场频率的函数的光学力中的几个峰值。共振激发并不一定最大限度地诱导净力，并且施加在分子上的力强烈地依赖于它们的电子结构的细节。在金属颗粒中的光学力大于在。我们还发现，光学力的线性依赖于近场的强度。
Optical forces induced by a near field are calculated for a 1-mm-sized metal particle mimicked by a jellium model and forin the framework of real-time and real-space time-dependent density-functional theory combined with a nonuniform light-matter interaction formalism, fully taking account of multipole interaction. A highly localized near field nonuniformly polarizes these molecules. The locally induced polarization charges in the molecules are partly canceled by the screening charges. The polarization and screening charges generally contribute to the attractive and repulsive forces, respectively, and a sensible balance between these charges results in several peaks in the optical force as a function of the frequency of the near field. The resonance excitation does not necessarily maximally induce the net force, and the force exerted on the molecules strongly depends on the details of their electronic structures. The optical force is larger in the metal particle than in. We also found that the optical force depends linearly on the intensity of the near field.