ObjectiveWith advancements in optical technology, the investigation of light-field-particle interactions has gained significant momentum. Such studies find widespread applications in optical manipulation, precision laser ranging, laser gas spectroscopy, and related fields. In optical manipulation techniques, employing two or more laser beams proves more effective for capturing and manipulating particles compared to using a single beam alone. Furthermore, as the demand grows for manipulating particles with intricate structures, there is a need to delve into the radiation e force characteristics of double Gaussian beams on non-uniform chiral particles. This research aims to deepen our understanding of how optical fields influence particles, thereby offering fresh perspectives on manipulating and utilizing non-uniform chiral layered particles at both micro- and nano-scales.
MethodBased on the generalized Lorentz-Mie theory (GLMT) and spherical vector wave functions (SVWFs), the expansion of the total incident field of a double Gaussian beam is derived using the coordinate addition theorem. The incident field coefficients and scattering coefficients of each region of the multilayer chiral sphere are obtained by enforcing boundary continuity and employing multilayer sphere scattering theory. The radiation force acting on non-uniform chiral layered particles within a double Gaussian beam is then derived through application of the electromagnetic momentum conservation theorem.
Results and DiscussionsThe correctness of the theory and programs in this paper is proven by comparison with existing literature. The influence of various parameters on the radiation force is analyzed in detail, such as the incident angle, polarization angle, beam waist width, beam center position, and internal and external chiral parameters. The results indicates that compared to a single Gaussian beam, counter-propagating Gaussian standing waves exhibit significant advantages in capturing or confining inhomogeneous chiral layered particles, offering enhanced particle manipulation capabilities. Additionally, by selecting an appropriate polarization state of the incident light, a delicate balance can be achieved among these parameters, effectively stabilizing the capture of inhomogeneous chiral particles.
ConclusionsThis study employs the generalized Lorenz-Mie theory and the principle of electromagnetic momentum conservation to derive analytical expressions for the transverse and axial radiation forces exerted by dual Gaussian beams on multi-layered chiral particles propagating in arbitrary directions. The research provides an in-depth analysis of how standing wave beams affect the radiation force behavior of non-uniform chiral particles. Numerical analysis reveals significant influences of beam waist, particle size, chiral parameters, polarization angle and mode, as well as particle refractive index on both transverse and axial radiation forces. This research is crucial for analyzing and understanding the optical properties of complex-shaped multilayer biological cells and has significant applications in the micromanipulation of multilayer biological structures.