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. Author manuscript; available in PMC: 2022 Nov 1.
Published in final edited form as: Nat Mater. 2022 Mar 24;21(5):540–546. doi: 10.1038/s41563-022-01210-8

Fig. 2 ∣. Creation of colloid crystal monolayers with cluster and spin dynamics studies via HANDS manipulation.

Fig. 2 ∣

a, Schematic of colloidal clusters being trapped in acoustic wells by applying SAWs in the x and y directions. b, Illustration of the generation of colloidal crystal monolayer by vertical focusing of particles with applied harmonic SAWs. c, Fluorescent imaging of colloidal crystal monolayers using 2 μm polystyrene particles formed by HANDS manipulation. Scale bar, 5 μm. d, Illustration of the spin directions, controlled by the phase difference (Δϕ = ϕx − ϕy) between X-SAWs and Y-SAWs. Scale bar, 5 μm. e, Characterization of the spin speed as a function of the phase difference at different excitation signal amplitudes ranging from 4 to 8 V. f, Comparison of the spin speed of colloidal crystal monolayers with different particle numbers and configurations.