Method for generating vortex light with rotation angular momentum and vortex light array with rotation angular momentum

Abstract

The invention discloses a method for generating vortex light with rotation angular momentum and a vortex light array with rotation angular momentum. On the basis of the shaping principle that a phase plate with rotation phase distribution is irradiated by a collimated light beam to generate a vortex light beam, the azimuth angle of a rotation phase and a proportional constant are multiplied, the rotation order of the rotation phase is in an ultrahigh level, and therefore the light which is similar to a line in light intensity distribution is generated in the observation (or imaging) plane perpendicular to the optical axis direction. Because the light is generated by the rotation phase and has rotation angular momentum, the light is called as the vortex light. The light beam can move particles on the observation plane perpendicular to the optical axis direction in a non-mechanical-moving mode. Multiple rotation phases modulated by blazed gratings are overlapped and distributed on the same phase plate, so that vortex light arrays arrayed in parallel are generated. The generated light beam has a unique optical characteristic, the generating method is simple and flexible, and the method can be used for the fields of optical tweezers technologies, light beam shaping and laser application.

Description

technical field [0001] The invention belongs to the fields of beam shaping, beam application and optical tweezers technology. The method of beam shaping is used to generate vortex light or vortex light array, which can be used for laser to move particles on the imaging plane without mechanical manipulation, laser processing, or new beam property analysis. etc., the present invention specifically relates to a method of generating vortex rays and arrays of vortex rays with rotational angular momentum. Background technique [0002] In recent years, with the development of beam shaping technology and micro-nano technology, optical tweezers technology has received extensive attention and practical applications in many fields such as physics, electronics, chemistry, materials, metallurgy, medicine, and biology. Optical tweezers technology is a technology that uses highly focused laser beams to fix, move, stretch, or rotate to manipulate tiny objects at the micron, nanometer, or ev...

AI Technical Summary

Problems solved by technology

However, the above methods all have problems such as short particle control distance and harsh conditions for forming the control beam.

Although the rotation phase or polarization characteristics of the beam can be used to rotate the particle in the observation plane perpendicular to the beam propagation direction, such as the vortex beam[4] and the circularly polarized beam[5], but this type of beam can only rotate the particle and cannot Particles move in a straight line on the viewing plane

Although it is possible to move particles along the waveguide by using an optical waveguide placed on the observation plane [6], the fabrication and optical coupling of the optical waveguide are still very difficult problems

Since the cross-sectional size of the optical waveguide is at the micron or submicron level, and the selection of materials needs to consider the refractive index of the solution instead of the refractive index of air, on the other hand, the efficient and convenient optical coupling between the light beam of the external light source and the optical waveguide is still It is one of the current technical bottlenecks, therefore, the application of optical waveguides for optical tweezers is still restricted

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