Single-fiber optical tweezers based on air defect microcavity

Abstract

The invention provides single-fiber optical tweezers based on an air defect microcavity. The device is characterized in that a conduction mode field 5 of a single-core optical fiber 3 is modulated through an air defect micro-cavity 2 to form a multi-stage divergent beam 6, then a strong convergent beam 7 is formed after total internal reflection occurs at a conical fiber end 4 and an external solution interface, and finally a plurality of convergent points 11 capable of capturing micro-nano particles 12 are formed on an optical axis. And an evanescent field capable of continuously transporting particles is formed on the surface of the tapered fiber end 4, so that the functions of particle transportation and multi-particle capture are integrated in a single optical fiber. In addition, the position and the number of the convergent points 11 can be adjusted by changing the optical wavelength, and the purpose of dynamically regulating and controlling the capture position or the motion state of the micro-nano particles 12 is achieved. The device can be used for light control and regulation of biological or medium micro-nano small particles, has the characteristics of integration, miniaturization, stabilization and the like, and has wide application prospects in the fields of multi-potential-well light capture, particle light stretching, particle light oscillation and the like.

Description

(1) Technical field [0001] The invention relates to a single-fiber optical tweezers based on an air defect microcavity. It is mainly used for the dynamic regulation of the motion state of tiny particles such as biomolecules, biological cells, nanoclusters, colloidal particles, and medium particles, including but not limited to capture, transport, oscillation, and ejection, etc., and belongs to the field of optical fiber technology. (2) Background technology [0002] After years of development, fiber optic tweezers have become an important research branch of optical tweezers. With the deepening of research on fiber optic tweezers, different optical manipulation objects have put forward higher requirements for the manipulation performance of fiber optic tweezers. In order to meet the functional requirements of optical micromanipulation in various situations, structured fiber optic tweezers have attracted the attention of researchers, and a variety of successful cases have been...

AI Technical Summary

Problems solved by technology

The patent (CN201110047640.4) proposes a particle transport device based on a hollow fused-core capillary fiber. However, due to the evanescent wave in the fiber, the optical force that can be provided from the fiber core to the cladding varies with the distance from the fiber The fiber core distance is getting smaller and smaller, so this device has low particle capture and transport capabilities

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