Research On The Method Of Manufacturing Photopolymer Fiber Optical Tweezers

In recent years,optical tweezers technology has played an undeniable role in non-contact manipulation of micro and nanoscale particles,such as biological cells,and has been widely applied in scientific fields such as atomic physics and biomedicine.Among them,the optical tweezers system based on fiber has attracted attention in fields such as optical fiber sensing and medical treatment due to its easy integration and simple operation.The ability of fiber optical tweezers to capture and manipulate particles is closely related to the geometric characteristics of the fiber probe tip.Therefore,the manufacturing method of fiber optical tweezers determines what functions can be achieved by fiber optical tweezers.At present,various mature manufacturing methods for fiber optical tweezers mainly include polishing,chemical etching,hot melt pulling,ball sticking,focused ion beam processing,two-photon lithography,and optical growth.Among them,the manufacturing method of fiber optical tweezers probes based on photopolymerization reaction is highly favored by scientists due to its simple operation,fast manufacturing,and easy reproduction.However,this type of manufacturing method currently only produces fiber probes with two-dimensional capture capabilities,greatly limiting its application scenarios.Based on the close relationship between the shape of photopolymerization products and the beam,this article uses fiber optic interference to obtain the Bessel-like beam induced photopolymerization and manufacture a fiber probe with three-dimensional capture capability.The main work of this article is as follows:In this paper,a fabrication method of photopolymer fiber optical tweezers probe based on Bessel-like beam is proposed.The single-multi mode fiber is obtained by welding a segment of step index multimode fiber with large core diameter at the front end of the single mode fiber,and the Bessel-like beam emitted from the fiber is used to initiate photopolymerization reaction.According to the characteristics of photopolymerization reaction and the special optical field of Bessel-like beam,this method can obtain a photopolymer probe with strong beam convergence ability,so as to realize a three-dimensional optical trap.In theory,optical simulation proves that the proposed fabrication method of fiber optical tweezers probe is feasible.In experiment,the fiber optical tweezers made by this method can realize the three-dimensional trapping of particles.In addition,the influence of the optical power intensity and the distribution of optical field of Bessel-like beam and the duration of photopolymerization reaction on the shape of the probe was investigated by the control variable method,and the three-dimensional particle capture was successfully completed by using the fiber optical tweezers probes manufactured under different parameters.In this paper,a Bessel-like beam based fiber optical tweezers probe manufacturing method is proposed for the first time to realize the all-fiber optical growth fiber optical tweezers manufacturing probe method,and to manufacture the photopolymer fiber optical tweezers with 3D capturing ability.