Small core diameter ultra-high numerical aperture cone optical fiber optical tweezers and manufacturing method thereof

Abstract

The present invention discloses a pair of small core and ultra-large numerical aperture taper fiber tweezers and a fabricating method thereof. The present invention is a pair of small core and ultra-large numerical aperture taper fiber tweezers, using the small core and ultra-large numerical aperture fiber to be processed, with the end of the fiber polished into a cone shape and the angle of the cone tip formed between 30 degrees and 120 degrees, and connected by means of the thermal thawing diffusion numerical aperture matching technology. Due to the large numerical aperture at the fiber tip, a divergent optical field is formed to cause a larger gradient force potential well of the optical field, thereby overcoming the deadweight of particles, realizing the single fiber three-dimensional trap of minute particles and such operations like fixing, moving, and transporting the trapped particles and so on. The small core and ultra-large numerical aperture taper fiber tweezers in the present invention can be used for trapping living biological cells or moving and assembling minute particles.

Description

(1) Technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a small core diameter superhigh numerical aperture cone optical fiber optical tweezers technology. (2) Background technology [0002] In 1986, Askin (Optics Letters, 11, 288-290, 1986) introduced a single laser beam into a high numerical aperture objective lens to form a three-dimensional optical potential well, realizing the three-dimensional space control of tiny particles. A strong focused laser is used to simultaneously form a gradient force potential well in the x-y plane and along the z-axis direction, thereby stably trapping particles. Since the optical trap is formed using only one laser beam, it is called a single-beam gradient force optical trap, which is commonly referred to as optical tweezers. [0003] At present, people can use optical tweezers to capture, sort, manipulate and bend the cytoskeleton of cells, organelles and chromosomes, overco...

AI Technical Summary

Problems solved by technology

However, in terms of structure, this kind of parabolic microstructure single-fiber needlepoint optical tweezers has the problem of insufficient structural strength due to the thin tip.

On the other hand, it is difficult to maintain the consistency of optical and mechanical properties of this microstructured single-fiber needle-shaped optical tweezers during batch processing.

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