Device for simultaneously demonstrating light diffraction effect and mechanical effect

A technology of light diffraction and effect, applied in the field of optics, can solve the problem of not being able to demonstrate the diffraction effect and mechanical effect of light at the same time

Inactive Publication Date: 2018-12-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the demonstrations of both optical effects are separate and require the use of two different devices
There is currently no system capable of simultaneously demonstrating the diffraction and mechanical effects of light

Method used

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  • Device for simultaneously demonstrating light diffraction effect and mechanical effect
  • Device for simultaneously demonstrating light diffraction effect and mechanical effect
  • Device for simultaneously demonstrating light diffraction effect and mechanical effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment 1 demonstrates the diffraction effect of light.

[0041] see figure 1 A device for simultaneously demonstrating light diffraction effects and mechanical effects includes a laser 1, a microscope, and the microscope includes a microscope objective lens 7, a sample cell 11, a stage 8 and an illumination source 9, and the illumination source 9 is located on the stage of the microscope 8 below.

[0042] A first thin lens 2, a second thin lens 3, and a first 45-degree total reflection mirror 4 are arranged in sequence corresponding to the light exit of the laser 1, and a second 45-degree total reflection mirror is arranged corresponding to the first 45-degree total reflection mirror 4 5. Corresponding to the second 45 degree total reflection mirror 5, a dichromatic mirror 6 is provided; the dichromatic mirror 6 is at an angle of 45 degrees, and the light-emitting end of the dichromatic mirror 6 corresponds to the microscopic objective lens 7 of the microscope...

Embodiment 2

[0057] This embodiment 2 demonstrates the mechanical effect of light.

[0058] The overall structure of the experimental device is the same as in Example 1.

[0059] When being used for the demonstration of the mechanical effect of light, the sample cell 11 is placed on the stage 8, and the suspension of micron balls is placed in the sample cell 11, and the micron balls are polystyrene microspheres with a diameter of 5 microns; see figure 2 , by fine-tuning the microscopic objective lens 7 so that the focal point of the microscopic objective lens 7 is 5 microns away from the bottom surface of the sample cell 11 .

[0060] The fundamental mode Gaussian beam emitted by the laser 1 is expanded by the first thin lens 2 and the second thin lens 3, and the beam is raised by the first 45-degree total reflection mirror 4 and the second 45-degree total reflection mirror 5, and the parallel beam is The dichroic mirror 6 is reflected into the microscopic objective lens 7 of the microsc...

Embodiment 3

[0064] Embodiment 3 simultaneously demonstrates the diffraction effect and the mechanical effect of light.

[0065] The overall structure of the experimental device is the same as in Example 1.

[0066] When used to demonstrate the diffraction effect and mechanical effect of light at the same time, the sample cell 11 is placed on the stage 8, and the suspension of micron balls is placed in the sample cell 11, and the micron balls are polystyrene microspheres with a diameter of 1 micron; The working distance of the microscopic objective lens 7 is 100 microns, and the thickness of the sample pool 11 is smaller than the working distance of the microscopic objective lens 7 .

[0067] The fundamental mode Gaussian beam emitted by the laser 1 is expanded by the first thin lens 2 and the second thin lens 3, and the beam is raised by the first 45-degree total reflection mirror 4 and the second 45-degree total reflection mirror 5, and the parallel beam is The dichroic mirror 6 reflect...

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Abstract

The invention relates to a device for simultaneously demonstrating a light diffraction effect and a mechanical effect. The device comprises an optical tweezers system composed of a laser, a first thinlens, a second thin lens, a first 45-degree full-reflecting mirror, a second 45-degree all-reflecting mirror, a dichroic mirror, a microscope objective, a sample cell, and an objective table along the optical path, and a microscopic imaging system composed of an illumination light source, an objective table, a sample cell, a microscope objective lens and a dichroic mirror along an optical path. After the laser beam passes through the objective lens, the size of the light outlet of the objective lens is small, the light beam is diffracted, and a diffraction ring light spot can be observed on the sample cell glass slide. In addition, due to the fact that the numerical aperture of the objective lens is very high, each laser diffraction bright strip is subjected to strong convergence throughthe objective lens, a light gradient force can be applied to the micron particles, and the particles are bound in bright strips. According to the invention, the micron particles can be orderly arranged according to the laser diffraction pattern, the display degree for directly understanding the light diffraction effect and the mechanical effect is high, and the device has important significance for understanding the mechanism formed by optical tweezers.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a device for demonstrating light diffraction effects and mechanical effects. Background technique [0002] Light has energy and momentum, and the momentum of light is the basic property of light. The light carrying momentum interacts with matter, and there will be an exchange of momentum between them, which is manifested as the force exerted by light on the object, and the force acting on the object can cause the object to move, which is called the mechanical effect of light. A typical application of photomechanical effect is optical tweezers technology. In 1986, Ashkin and others realized the three-dimensional trapping of biological cells by using a strong converging laser beam. This invention is called a single gradient force optical trap or optical tweezers. The invention of optical tweezers has enriched and promoted the development of the optical field, highli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B23/22
CPCG09B23/22
Inventor 钟敏成刘爱银
Owner HEFEI UNIV OF TECH
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