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Particle shape and medium chirality are two key features recently used tocontrol anisotropic colloidal self-assembly and dynamics in liquid crystals.Here, we study magnetically responsive gourd-shaped colloidal particlesdispersed in cholesteric liquid crystals with periodicity comparable or smallerthan the particle's dimensions. Using magnetic manipulation and opticaltweezers, which allow one to position colloids near the confining walls, wemeasured the elastic repulsive interactions of these particles with confiningsurfaces and found that separation-dependent particle-wall interaction force isa non-monotonic function of separation and shows oscillatory behavior. We showthat gourd-shaped particles in cholesterics reside not on a singlesedimentation level, but on multiple long-lived metastable levels separated bya distance comparable to cholesteric periodicity. Finally, we demonstratethree-dimensional laser tweezers assisted assembly of gourd-shaped particlestaking advantage of both orientational order and twist periodicity ofcholesterics, potentially allowing new forms of orientationally andpositionally ordered colloidal organization in these media.

Magnetically responsive gourd-shaped colloidal particles in cholesteric liquid crystals