Figure 1
From: Optical tweezing and binding at high irradiation powers on black-Si
(a–e) Fluorescence micrographs of 2-dimmensional (2D) trapping behavior of polystyrene beads (d = 500 nm) on a metal-free black silicon (MFBS) substrate (light intensity I = 320 kW/cm2). Laser irradiation area is expressed as a blue circle (focus diameter, 3 μm). 0 s (a) means the time before starting laser irradiation, and the time in the images (b–e) shows laser irradiation time. Scale bar is 1 μm. (e) A representative scanning electron microscope (SEM) image of the MFBS surface.
