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We simulate colloids (radius $R \sim 1\mu$m) trapped at the interface betweena cholesteric liquid crystal and an immiscible oil, at which the helical order(pitch p) in the bulk conflicts with the orientation induced at the interface,stabilizing an ordered array of disclinations. For weak anchoring strength W ofthe director field at the colloidal surface, this creates a template, favoringparticle positions eitheron top of or midway between defect lines, depending on$\alpha = R/p$. For small $\alpha$, optical microscopy experiments confirm thispicture, but for larger $\alpha$ no templating is seen. This may stem from theemergence at moderate W of a rugged energy landscape associated with defectreconnections.

Colloidal templating at a cholesteric - oil interface: Assembly guided by an array of disclination lines