The video shows a representative deployable micro-trap after 3 h of incubation, containing trapped bacteria moving inside it. The movie was captured with an optical microscope (OLYMPUS CKX41) equipped with a camera (OLYMPUS SC50) and displayed in real time.
(a) Schematic of the rectifying funnel apertures and optical microscopy image of a micro-trap, scale bar 50 μm. Red dots: bacteria emphasized from a frame of the Supplementary Video 1. (b) Computer aided design 3D model of a micro-trap rendered in semi-transparent material, similar to the one used in the experiments, cut vertically into two halves to show the internal funnel structures. The inner volume of the structures calculated from this model is 1.72 nL. (c) SEM picture of a micro-trap. Scale bar, 80 μm. (d) 3D micro-traps on glass before detachment. Top panel: SEM image; lower panel: optical image. Scale bars, respectively, 500 μm and 5 mm. (e) Suspension of micro-traps in water. Scale bar, 1 cm.