Patent ID: 7838819
Filing Date: 2010-11-23
Classification: G02B

Abstract:
1. An apparatus of generating optical tweezers with transverse momentum, for providing first optical tweezers with a first momentum on a test piece, the apparatus comprising: a laser source, for outputting a laser beam; a diffractive optical element (DOE), having a first phase-delay picture, wherein the laser beam forms a diffraction pattern after passing the first phase-delay picture; a lens, for receiving and focusing the diffraction pattern on the test piece to form the first optical tweezers with the first momentum; wherein the lens has an optical axis intersecting the DOE at an optical intersection point, a geometric center of the phase-delay picture has a displacement vector relative to the optical intersection point and a direction of the first momentum is related to a direction of the displacement vector; and the phase delay φ(x, y) of each point (x, y) on the first phase-delay picture of the DOE satisfies: φ(x, y)=(f