Controlled Propulsion of

Abtract—There is currently much interest in controlled motion of micro-/nano-bots that may navigate fluids and tissue, so that they can ultimately deliver chemicals or aid medical diagnosis and therapy. This necessarily entails symmetry breaking to enable locomotion in low-Reynolds number fluid environments. Whether a bottom-up or top-down engineering approach is used, chiral symmetries play a special role from molecules to micron length-scales and naturally facilitate directed diffusion and propulsion. A vacuum shadow-growth method (glancing angle deposition, GLAD) permits the fabrication of chiral colloida