A kind of experimental device and method for particle multiple branching for vacuum optical tweezers system

Abstract

The invention discloses an experimental device and method for multiple initiation and branching of particles used in a vacuum optical tweezers system. An ultrasonic transducer is installed on the electric translation table, and a substrate is fixed on the ultrasonic transducer; a metal box is arranged on the side of the electric translation table, and a movable bottom plate is installed inside the metal box, and the bottom surface of the movable bottom plate and the inner bottom surface of the metal box Connected with a spring, the upper cavity of the metal box above the top surface of the movable bottom plate is filled with particles; the focused beam is in the vacuum cavity, and the focus of the focused beam is between the side of the ultrasonic transducer and the metal box and is located between the substrate and the metal box directly below; the end of the substrate close to the metal box is used as the adsorption end, and the adsorption end is processed into a sharpened tip shape, and the metal box is provided with a notch on the side wall close to the adsorption end facing the substrate. The invention increases the number of microparticle initiations in the vacuum optical tweezers system from tens to thousands, further ensures the stability of the overall experimental system, and has practical application value.

Description

technical field [0001] The present invention relates to a device and a method for particle branching in optical tweezers, in particular to an experimental device and method for multiple particle branching experiments in a vacuum optical tweezers system. Background technique [0002] In 1971, American physicist Ashkin and others used a lens to weakly focus a beam of laser light propagating vertically upwards, and used optical methods to stabilize glass particles with a diameter of 20um for the first time. In 1986, he discovered that after strongly focusing a single laser beam, particles can be stably captured without relying on gravity. This technique was named optical tweezers. In 2018, Ashkin won the Nobel Prize in Physics for his invention of optical tweezers. The principle of optical tweezers is that the strongly focused laser beam produces a force that always points to the focus on the medium particle, and its magnitude is proportional to the electric field gradient, so...

AI Technical Summary

Problems solved by technology

[0009] In view of the current optical tweezers research, the total number of times of the current direct starting method in the cavity is generally on the order of ten, the number of starting times is small, and the particle capture stability, measurement continuity and measurement accuracy of the optical tweezers system are insufficient. In view of the current situation, the present invention proposes a device and method for multiple particle initiation experiments in the vacuum optical tweezers system, which can increase the number of particle initiations in the vacuum optical tweezers system from tens of times to thousands of times, and further It ensures the stability of the overall experimental system and has practical application value

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