Method and device for generating radial or angled polarization self-focusing Airy beam

Abstract

The invention relates to a method and a device for generating a radial or angled polarization self-focusing Airy beam. The method includes regulating polarization states of a collimating Gaussian beam to obtain a linear polarization Gaussian beam polarizing along a certain direction; performing light splitting to obtain a transmission beam, emitting the obtained transmission beam vertically to a spatial light modulator loaded with a phase information graph and then emitting the beam out in a reflecting manner after phase modulation; performing light splitting to obtain a reflected beam, subjecting the reflected beam to Fourier transformation and then converging the reflected beam by a convex lens so as to obtain a linear polarization self-focusing Airy beam through an annular stop at the focus point of the convex lens; and finally carrying out radial or angled polarization conversion to obtain the radial or angled polarization self-focusing Airy beam. By the method, self focusing can be carried out without any optical focusing elements, the light intensity in front of the focus point is low, the light intensity at the focus point is increased, energy is concentrated, and accurate positioning is achieved. The method can be applied to the fields of particle arrestance, biological medicines and the like, and belongs to the technical field of applied optics. In addition, the device is simple in structure and high in stability and is adjustable.

Description

technical field [0001] The invention relates to a method and a device for generating radially or angularly polarized self-focusing Airy beams. The generated beams can be used in the fields of particle capture, biomedicine, etc., and belong to the field of applied optics technology. Background technique [0002] Circularly symmetric Airy beams have aroused great interest and widespread attention due to their unique self-focusing properties, also known as self-focusing Airy beams. The so-called self-focusing refers to the focusing of the beam during the transmission process in free space or medium due to its own transmission properties without the aid of focusing optical elements. At the same time, the self-focusing phenomenon of the Airy beam is also very special. The light intensity of the beam is low before focusing, but the light intensity increases rapidly at the focus, and the energy is accelerated and concentrated. The maximum light intensity at the focus can reach the ...

AI Technical Summary

Problems solved by technology

The self-focusing Airy beam is a solid beam at the focal point. When it is specifically applied to the optical confinement of particles, it can only capture those particles whose refractive index is larger than the surrounding medium at the focal point, and is not suitable for capturing particles whose refractive index is smaller than the surrounding medium.

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