This paper investigates the internal field scattering of multilayered chiral spherical particles by a zero- order Bessel beam. Based on the Generalized Lorenz-Mie Theory (GLMT). An expression for the internal field of chiral spheres with multilayer structure at incidence of a zero-order Bessel beam is derived by Sphere Vector Wave Function (SVWFS). Using the iterative method for multilayered sphere scattering, the internal field coefficients for each region within the multilayered chiral spheres were obtained. A detailed analysis was conducted about the Bessel beam’ cone angle and chiral value of each part of the multilayered spheres on the total internal electric field and polarization components. The results indicate that as the cone angle increases, the total internal electric field of the multilayered chiral spheres gradually decreases, with the maximum electric field intensity shifting toward the center of the sphere. As the chiral parameter of the outer layer increases, the total internal electric field intensity within the chiral sphere first increases and then decreases. With the increase of the chiral parameter of the inner layer, the distribution range of the maximum electric field intensity becomes narrower. The findings of this study provide theoretical insights into the internal field scattering characteristics of chiral multilayered particles, which are of significant value for the optical manipulation of chiral multilayered particles.
This study investigates the electric field of chiral particle when double Hermite-Gaussian (HG) beam scattering. By combining Mie theory with the method of complex point sources, electric and magnetic fields of HG are obtained in terms of Spherical Vector Wave Function (SVWFs). By employing coordinate rotation theorem, the expansion of a single HG is extended to that of arbitrary incident dual HG. Expanding the electromagnetic fields within various regions of chiral particles using boundary conditions allows for the derivation of scattering coefficients for internal fields of chiral spheres under dual-beam scattering. We conducted numerical simulations of inner electric field and analyzed variations in internal intensity of chiral spheres. The research findings indicate that when beam propagates to the sphere at different angles, the maximum value of electric field according to vector superposition of two beams. Moreover, when dual Hermite-Gaussian beams propagate in opposite directions, the distribution of the total internal electric field exhibits high symmetry. As the chirality parameter increases, the internal electric field within the chiral particles first increases and then decreases. These research findings will provide valuable insights for the development of chiral particle identification techniques and the application of dual-beam optical manipulation techniques.
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