At a Z-depth of -1.5 µm, corresponding to a higher power density of 14 MW/cm 2 , a concentric ring-like structure was observed in approximately 70% of the cases, with most of the particles not contributing to any specific pattern in the optical matter (Figure ). In about 30% of the experiments, a cubic-shaped structure appeared at the center of the optical matter, with the cubic lattice parameters being calculated from the observed structure (Figure ). At a Z-depth of -2.5 µm, hexagonal packing structures began to form at the center of the optical matter, though fewer particles contributed to the hexagonal arrangement, with the corresponding hexagonal unit cell parameters extracted (Figure ). Finally, at a Z-depth of -3.5 µm, the OM exhibited a well-ordered hexagonal packing structure with an ABA pattern, representing the highest packing density observed.