Fiber Micro-optics Technology And Its Application Based On Micro-axicon Structure

Since the development of microfabrication technology,the micro-scale optical surface structure has been continuously designed and applied in medical,communications,electronics and other fields,in the optical discipline on the birth of the micro-optics this cutting-edge branch of the discipline.Micro optics is an optical function device and a surface microstructure on the scale of micrometer scale,and the optical fiber can make the optical path easy and easy to use,and the combination of optical fiber and micro optics can further expand the application field of micro optics.In this paper,we focus on the theoretical analysis and numerical simulation of the optical fiber micro-optical element,especially the fiber-optic cone structure,and study the preparation process to process the high-precision fiber cone structure.Through the fiber-cone structure,We have successfully applied it to laser direct writing,laser diode coupling,optical tweezers,subwavelength focusing,and contribute to the application and development of fiber micro optics.This paper mainly has the following contents:First of all,this paper briefly introduces the background and development course of optical fiber micro-optical technology,and focuses on the focusing characteristics of the Bibel light beam.Then,the focusing process of the micro-cone structure of the fiber is deduced and the numerical simulation is carried out.The existing micro-cone structure processing method is introduced.The high-precision fiber micro-cone structure is fabricated by the mechanical grinding method.And the outgoing beam was measured,laying the foundation for the next step in the actual expansion of the application.Secondly,this paper introduces the processing method of the existing micro-cone lens,and then elaborates our preparation process of making the miniature cone lens with the laser direct writing technique based on the grinding cone fiber,and analyzes the grinding process Cone fiber angle,the distance between the grinding cone fiber and the UV resin,the UV laser power and the exposure time on the final forming microlens.Finally,we successfully applied the technique to the microlens array and the production of the microlens.In this paper,the present situation of laser diode and fiber coupling is briefly analyzed,and the efficiency and advantages and disadvantages of several coupling methods are compared.The fabrication of fiber microlens by laser direct writing method is proposed for laser diode coupling and detailed The process of simulating the model in Zemax is described.The fabrication process of fiber microlens is introduced,and the actual coupling efficiency is measured and optimized.Then,the research status of optical tweezers is introduced,and the advantages and disadvantages of space-type optical tweezers and optical fiber tweezers are analyzed.In this paper,we combine the bending independence and rotational linearity of the LP21 model and the excellent focusing performance of the fiber cone structure.A new four-spot optical tweezers system is built and the optical fiber tweezers are used to capture,move and rotate the particles.In addition,we have also actively tried the dual-fiber optical tweezers system to achieve the suspension of biological cells and three-dimensional control.In this paper,the research status of subwavelength focusing is studied.Based on the theory of angle spectrum synthesis,the double cone subwavelength focusing structure with fiber is proposed.The structure is analyzed and simulated numerically,and a complete set The double-cone structure was prepared by using a knife-edge method to measure the focused spot and a good sub-wavelength focusing effect was measured.Finally,the research work of this paper is briefly summarized and the prospect of optical fiber micro-optics is made.