Fig. 4: Computed optical trap stiffness and force contributions as a function of Si NP diameter.
From: Optical trapping with optical magnetic field and photonic Hall effect forces
Trapping stiffness coefficients of the Si nanoparticle in the x- and y-directions in the Gaussian beam shown in Fig. 3a as a function of nanoparticle diameter. The color is encoded to indicate the changing contributions transitioning from dipole force of Eqs. (1), and (2) to transverse scattering force dominated case as the particle’s size increases. Positive values of κy mean repulsion that pushes the particle away from the central region of the Gaussian beam in the y-direction.
