Geometrical interpretation of negative radiation forces of acoustical Bessel beams on spheres.
Geometrical interpretation of negative radiation forces of acoustical Bessel beams on spheres.
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DOI：
10.1103/physreve.84.035601
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
Likun Zhang;P. Marston
中科院分区：
文献类型：
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作者：
Likun Zhang;P. Marston
许多研究人员预测了以贝塞尔光束为中心的球体上的声学或光学辐射力与光束传播方向相反的情况。我们开发了任意阶螺旋光束和普通贝塞尔光束的声学和光学辐射力之间的类比，以深入了解负辐射力。辐射力以散射场的不对称性、散射功率、吸收功率和贝塞尔光束的锥角来表示，并且与散射的分波系数有关。仅当相对于向前半球的散射抑制向后半球的散射时，才会出现负力。吸收的功率会降低负辐射力。
Various researchers have predicted situations where the acoustical or optical radiation force on a sphere centered on a Bessel beam is opposite the direction of beam propagation. We develop the analogy between acoustical and optical radiation forces of arbitrary-order helicoidal and ordinary Bessel beams to gain insight into negative radiation forces. The radiation force is expressed in terms of the asymmetry of the scattered field, the scattered power, the absorbed power, and the conic angle of the Bessel beam and is related to the partial-wave coefficients for the scattering. Negative forces only occur when the scattering into the backward hemisphere is suppressed relative to the scattering into the forward hemisphere. Absorbed power degrades negative radiation forces.