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Tailoring the gradient and scattering forces for longitudinal sorting of generic size chiral particles

Optics Letters
  • Hongxia Zheng, Xiao Li, Jack Ng, Huajin Chen, and Lin Zhifang
  • received 05/21/2020; accepted 07/08/2020; posted 07/09/2020; Doc. ID 398216
  • Abstract: Based on the concepts of conservative and nonconservative optical forces (COF and NCOF), we analyze the physical mechanism of longitudinal chirality sorting in some simple optical fields. It is demonstrated, both numerically and analytically for particle of arbitrary size, that the sorting relies solely on the NCOF, which switches its direction when particle chirality is reversed. For particles larger than half of the optical wavelength λ, the NCOF far surpasses its counterpart COF, enabling the longitudinal chirality sorting. When the particle is much smaller than λ, however, the COF outweighs the NCOF, destroying the sorting mechanism. A scenario is thus proposed that suppresses the COF and restores the dominance of the NCOF, extending the applicability of the longitudinal chirality sorting to small particles
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