A single-fiber optical tweezers with laterally adjustable capture position

Abstract

The invention belongs to the field of optical fiber technology research, and particularly relates to a pair of single-optical-fiber optical tweezers with transversely adjustable capture positions. The single-optical-fiber optical tweezers with the transversely adjustable capture positions comprise an ordinary standard single-mode optical fiber for communication, an optical fiber light source and a mode rotating device, wherein a tail fiber of the optical fiber light source is in staggered connection with the single-mode optical fiber; an LP11 mode optical beam is excited out in a fiber core of the single-mode optical fiber; after the other end of the single-mode optical fiber is connected with the mode rotating device, the tail end is prepared into an inclined conical tip, and the cone angle of an inclined space is alpha; and the distribution direction of profile light spots of the LP11 mode light beam is rotated through the mode rotating device, so an emergent light field formed by the LP11 mode light beam converged through the inclined optical fiber conical tip rotates along with the rotation of the distribution direction. The single-optical-fiber optical tweezers have the advantages that the new functions of the optical-fiber optical tweezer technology used in extreme working environment are expanded; the single-optical-fiber optical tweezers can realize the controllable adjustment on microparticle capturing transverse positions, and can be widely applied in the field of biomedical research.

Description

technical field [0001] The invention belongs to the field of optical fiber technology research, in particular to a single optical fiber optical tweezers with laterally adjustable capturing positions. Background technique [0002] As a tool for studying scientific phenomena in the microcosm, optical tweezers were first proposed by Ashkin and his colleagues at Bell Laboratories in the United States in 1986 [Optics Letters,18(5):288-290,1986]. Optical tweezers technology uses laser beams to achieve non-mechanical contact capture and manipulation of particles on the scale of microns and nanometers, without mechanical damage to the particles, and thus hardly affects the surrounding biological environment of the particles. In addition, biological particles themselves have good penetrability to light, making optical tweezers technology especially suitable for living or in vivo manipulation of biological particles. At the same time, optical tweezers can detect the small interaction...

AI Technical Summary

Problems solved by technology

After the axial position is adjustable, it is natural to think of preparing a single-fiber optical tweezers with adjustable lateral displacement. However, in view of the axisymmetric nature of the fiber itself, the optical field distribution after the beam converges at the fiber end is still symmetrical about the fiber axis. Therefore, in Lateral movement near capture position is always difficult to achieve

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