Medium nanoparticle assembling and fixing method based on optical tweezers system

A nanoparticle and fixing method technology, which is applied in the field of optical manipulation, can solve the problems of narrow application range, difficult to precisely control, and high cost, and achieves the effect of wide application range and shortened experimental period.

Inactive Publication Date: 2021-06-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "top-down" method is a method for constructing a nanostructure system by etching relatively large-sized substances through various physical and chemical means. This method has been quite perfect, but the process is complicated and expensive.
The "bottom-up" method is a method in which smaller structural units self-assemble into a relatively larger and more complex structural system through weak interactions. There are still some problems in this method, such as difficulty in precise control, narrow scope of application, Cannot be applied in a large area, etc.
Although the nanoparticle assembly method based on the optical tweezers system can solve the above problems to a certain extent, the existing optical tweezers manipulation technology still has some difficulties in the assembly of high refractive index dielectric nanoparticles.

Method used

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  • Medium nanoparticle assembling and fixing method based on optical tweezers system
  • Medium nanoparticle assembling and fixing method based on optical tweezers system
  • Medium nanoparticle assembling and fixing method based on optical tweezers system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This example introduces the specific process of preparatory work for the assembly of particles using the optical tweezers system, including the following:

[0045] 1. Put the transparent substrate to be used into acetone, absolute ethanol and deionized water in sequence, and use an ultrasonic oscillator to vibrate and clean for 15 minutes respectively; take out the cleaned transparent substrate, blow off the excess water on the surface with an ear blower and remove it. Dry it on a heating plate, cut the transparent substrate into small pieces of suitable size, and store them separately in the sample box;

[0046] The upper and lower edges of the transparent substrate can also be glued with double-sided adhesive tape of the same thickness. This operation can form a layer of gap between the conductive glass and the cover glass, so that the medium nanoparticle suspension dropped into it has a larger operating space under the optical tweezers, thus facilitating the manipula...

Embodiment 2

[0051] In this embodiment, the high-refractive medium nanoparticles are fixed on the substrate by creating a potential well to capture the medium nanoparticles and using the photothermal effect. image 3 A schematic diagram of the assembly and immobilization of media nanoparticles is shown, which specifically includes the following steps:

[0052] (1) Turn on the illumination source to the appropriate brightness, coarsely adjust the focus to see if the sample to be processed can be seen through the eyepiece, and fine-tune the focus after seeing the sample to be processed to position the image seen on the substrate surface, and then adjust the sample stage through the joystick Find the position and structure of the particles that need to be assembled in the XY direction. Turn on the computer software of the optical tweezers system to present the imaging picture on the computer screen, adjust the camera frame number and exposure time to make the imaging effect the best, and fine...

Embodiment 3

[0059] In this embodiment, the dark field scattering spectrum of Si nanoparticles fixed on the substrate nanostructure is measured by a single particle dark field spectrum testing system, and the Si nanometers of different sizes and structures are simulated by FDTD (Finite Difference Time Domain). The scattering spectrum of the particles reproduces the experimental spectrum, their optical modes are analyzed, and the structure and size of the Si nanoparticle clusters in the measured medium are determined.

[0060] like Figure 5 Shown is a diagram of the detection device for measuring the dark field scattering spectrum, through which the particles assembled on the nanostructure of the substrate can be measured; first select the Si nanoparticle cluster on the sample, Image 6 1, 2, 3 and 4 all represent Si nanoparticle clusters; then measure the corresponding dark field scattering spectrum by spectrometer, the test results are as follows Figure 7 shown. By analyzing the obtai...

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Abstract

The invention belongs to the technical field of optical manipulation, and discloses a medium nanoparticle assembling and fixing method based on an optical tweezers system. On the basis that a traditional optical tweezers system can control a micro-nano-scale object, a method of increasing laser power and an objective lens numerical aperture is adopted, and assembling of high-refractive-index medium nanoparticles is achieved. By optimizing the laser power and the position of the laser potential well and utilizing the photothermal effect of the medium nano-particles, the medium nano-particles are attached to the substrate and can be permanently fixed, and a method is provided for constructing a more complex and accurate composite nano-structure. The two problems that high-refractive-index medium nano-particles are difficult to control and the controlled particles are difficult to fix in a traditional optical tweezers technology are solved, the assembly process is novel, controllability and accuracy are high, cost is low, and the application range is wide. The application of the technology plays an important role in construction of a novel composite nano structure and related nano photonics effect research.

Description

technical field [0001] The invention belongs to the technical field of optical manipulation, and in particular relates to a method for assembling and fixing medium nanoparticles based on an optical tweezers system. Background technique [0002] Currently, there are generally two methods for constructing nanostructure systems, namely the "top-down" method and the "bottom-up" method. The "top-down" method is to etch relatively large-sized substances by various physical and chemical means to construct a nanostructure system. This method has been quite perfect, but the process is complicated and expensive. The "bottom-up" method is a method in which smaller structural units self-assemble into a relatively larger and more complex structural system through weak interactions. There are still some problems with this method, such as difficulty in precise control, narrow scope of application, It cannot be applied in a large area, etc. Although the nanoparticle assembly method based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00
CPCB82B3/0061
Inventor 严佳豪毛笔君刘心悦
Owner JINAN UNIVERSITY
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