We demonstrate a simplified method of rotational control of objects trapped within optical tweezers that does not require high-order modes, interferometric precision, or computer-controlled optical modulators. Inserting a rectangular aperture into the optical beam results in a focused spot that also has rectangular symmetry. We show that an asymmetric object trapped in the beam has its angular orientation fixed such that rotation of the aperture results in a direct rotation of the particle.
© 2002 Optical Society of America
Anna T. O'Neil and Miles J. Padgett, "Rotational control within optical tweezers by use of a rotating aperture," Opt. Lett. 27, 743-745 (2002)