Fig. 5
From: Crossover from positive to negative optical torque in mesoscale optical matter
Optical interactions among NPs in optical matter arrays. a GMT-Langevin dynamics simulations of a 7-NP array where NP optical interactions are turned off. b The interactions are turned on causing rotation of the array. c Scattering cross-sections and optical torque for a 12 NP optical matter array built on an equilateral trigonal lattice with variable lattice spacing, while the illumination wavelength is fixed at 800 nm and in a medium with refractive index n = 1.33. The scattering peak at Δ = 647 nm corresponds to the 01 LP mode predicted by Eq. (1). d Scattering cross-sections and optical torque of the same array for different incident wavelengths. The lattice spacing is fixed at 600 nm. The scattering peak at λ = 747 nm corresponds to the 01 LP mode while the peak at λ = 432 nm corresponds to the 11 mode
