Fig. 1: Light-mill design and performance.
From: An optically driven microstructure for torque measurement in rotary molecular motors
a An array of light-mill structures. b Close-up view on a single light-mill. c–f Brightfield images of light-mills. The four-arm design (d) is shown along with variants with three (c), five (e) and six (f) arms. The structures are held in position by an optical trap but are free to rotate around their axis. All scalebars are 1 μm. g Angular speed of the light-mills in (c–f) as a function of the laser power. h Ratio between the oscillating coefficient and the constant term of the optical torque (see Eq. (2)) as a function of power
