Nanoparticle conveyor based on multi-fiber optical tweezers

Abstract

The invention provides a nanoparticle conveyor based on multi-fiber optical tweezers. The nanoparticle conveyor is characterized by consisting of a single-core optical fiber, a plurality of single-core optical fibers positioned in the same plane, a microsphere lens and micro-nano particles. According to the invention, the microsphere lens is captured based on the free transmission light beams generated by the plurality of single-core optical fibers, and the transverse controllable movement of the microsphere lens near the capturing position is realized by changing the power of the introduced light. Three-dimensional capture of the micro-nano particles is realized by utilizing a strong convergent light beam formed by a light beam introduced into the optical fiber vertical to the plane afterpassing through the microsphere lens; fano resonance and surface plasma resonance phenomena are generated by the specially-made particles in a specific optical band; the micro-nano particles mainly show metal characteristics and are ejected out, and finally, the micro-nano particles can be accurately captured and ejected by changing the optical power in the optical fiber used for capturing the microsphere lens and the wavelength of the optical wave in the optical fiber used for capturing the micro-nano particles. The device is mainly used for propelling and transporting micro-nano particles.

Description

[0001] (1) Technical field [0002] The invention relates to a nanoparticle transporter based on multi-fiber optical tweezers, which is mainly used for light manipulation and propulsion of micronanoparticles such as biomolecules, biological cells, drug particles, nanoclusters, colloidal particles, and medium particles, and belongs to field of optical fiber technology. [0003] (2) Background technology [0004] 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, ...

AI Technical Summary

Problems solved by technology

Fiber optic tweezers with this structure need to be corroded multiple times during the processing process, the steps are complicated, the processing time is long, and the yield is low; the processing process requires the use of toxic substances such as hydrofluoric acid, which has high requirements for the processing environment.

[0007] Some researchers put forward a series of reports [Chinese patents CN102147500A, CN101950049A, CN 101907742A, CN101893736A, CN101881858A], and proposed single optical tweezers technology based on multi-core optical fiber. However, the single-fiber optical tweezers with adjustable lateral displacement of particles have not been solved yet.

Since then, the optical tweezers based on circular multi-core optical fiber proposed by Yuan Libo et al., the publication number is CN101236275; It can realize the functions of capturing particles, positioning them in space, and rotating them in space. They all face the problem of how to control the force of multi-beam optical traps. It is more complicated to analyze the light field of a single multi-core optical fiber converging at the fiber end. The control accuracy of the particles is greatly reduced. Due to the complex core structure of the multi-core optical fiber, it is very difficult to control the optical power distribution between the light source injection and multiple cores.

[0008] In the related patent research on particle transport, the current related reports [Chinese patents CN101950049 B, CN101907742B, CN101893736B, CN101881858B], although the proposed method of particle transport is feasible, but the control precision of particles is not high enough, many devices are actually It is difficult to operate at the nanometer level, and the capture of particles is not flexible and accurate enough, and the adjustability is not enough

[0009] In addition, the multi-core optical fiber or ring core proposed in the report has high cost of drawing and is not easy to purchase

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