Solid-liquid-solid process for forming free-standing gold nanowhisker superlattice by interfering femtosecond laser irradiation

► Perfectly aligned gold nanowhisker superlattice was fabricated via solid-liquid-solid process induced by interfering femtosecond laser. ► The shape is defined by liquid motion and not by crystallographic growth although its structure is polycrystalline. ► The smallest curvature radius of its vertex was 3.4 nm, and the period of the nanowhisker superlattice was 2.2 μm. ► The processing speed exceeds 1 cm2/s.