Reconfigurable manipulation of perovskite nanoparticles with a cusp-catastrophe Bessel beam

Exploring reconfigurable axial trapping within perovskite nanoparticles can advance our understanding of their dynamic behaviors, but fine research tools are needed for precise control and modulation. We present a method to study the interaction between perovskite particles and optical fields at the single-particle level, proposing an autofocusing cusp-catastrophe Bessel beam (CCBB) with reconfigurable multiple foci along the propagation direction. The CCBB displays multiple autofocusing with quasi-diffraction-free features. The geometric parameters of the beam can precisely control the quasi-diffraction-free distances, the focus positions, the peak intensities, the trapping forces, etc. Our theoretical proposal for the CCBB has been experimentally corroborated through the generation of the CCBB. We further apply the CCBB to trap ${\mathrm{Cs}}_3{\mathrm{Cu}}_2{I}_5$ perovskite particles ranging from micrometers to nanometers at multiple longitudinal foci and evaluate the trapping forces at the respective focus. The CCBB offers a potent tool for optical trapping and manipulation, playing a pivotal role in uncovering the interactions between perovskite materials and optical fields.