Chen Antao, Wang Jiajie, Han Yiping, Cui Zhiwei, Yu Meiping
Opt Express. 2018 Oct 1;26(20):26766-26775. doi: 10.1364/OE.26.026766.
In this paper, the nondiffracting Bessel beam sources are implemented in finite-difference time-domain (FDTD) method. The high-order scattered-field algorithm of the FDTD (SF-FDTD (2, 4)) method is employed to investigate the scattering of particles illuminated by Bessel beams. In the SF-FDTD (2, 4) method, the scattered fields of the whole region are calculated directly by time stepping and the incident fields are obtained by the vector expressions of the diffraction-free Bessel beam. Some numerical results are included to illustrate the validity and capability of the proposed method. This study is expected to provide a new efficient method to investigate the interactions between nondiffracting beams and complex particles.
本文采用时域有限差分（FDTD）方法实现了无衍射贝塞尔光束源。运用FDTD的高阶散射场算法（SF - FDTD(2, 4)方法）来研究贝塞尔光束照射下粒子的散射情况。在SF - FDTD(2, 4)方法中，通过时间步长直接计算整个区域的散射场，而入射场则由无衍射贝塞尔光束的矢量表达式得到。文中给出了一些数值结果以说明所提方法的有效性和能力。本研究有望为研究无衍射光束与复杂粒子之间的相互作用提供一种新的有效方法。
