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SPP optical tweezers system

A technology of optical tweezers and monitoring systems, applied in the field of SPP optical tweezers systems, can solve the problems that single metal particles cannot be captured and manipulated, and the number of metal particles cannot be precisely controlled.

Active Publication Date: 2015-09-09
深圳市深光谷科技有限公司
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  • Abstract
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Problems solved by technology

[0006] However, the existing SPP optical tweezers technology, due to the strong attraction to metal particles, often attracts multiple metal particles in the SPP field to the central area to form clusters, and the number of captured and manipulated metal particles cannot be accurately achieved. control, especially the inability to capture and manipulate single metal particles

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The SPP optical tweezers system of the present invention is used to manipulate metal particles on the interface between metal and medium, including an excitation light source unit, a monitoring system and an optical tweezers microscopic platform.

[0030] The optical tweezers micro platform includes an object stage on which the interface between the metal and the medium is formed. The excitation light source unit generates two incoherent laser beams, and makes the two incoherent laser beams generate a converging SPP field and a diverging SPP field at the metal-medium interface respectively, and the converging SPP field is included in the diverging SPP field. The converging SPP field forms a potential well to confine metal particles within it...

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Abstract

The invention relates to an SPP optical tweezers system which is used to control metal particles on a metal and medium interface. The system comprises a laser source unit which generates two non-coherent laser beams, the two non-coherent laser beams generate a gathering SPP field and a radiating SPP field at the metal and medium interface respectively, the gathering SPP field is contained in the radiating SPP field, the gathering SPP field forms a potential well to capture metal particles within the gathering SPP field, and the radiating SPP field repulses metal particles beyond the radiating SPP field. The amount of captured and controlled metal particles can be accurately controlled, even a single metal particle can be stably captured and controlled, and the system has great significance in leading fields as SERS research.

Description

technical field [0001] The invention belongs to the technical field of near-field optics, in particular to an SPP optical tweezers system. Background technique [0002] In recent years, due to the unique chemical and physical properties of metal nanoparticles, metal particles have shown very important application prospects in the fields of biochemistry, catalysis, and surface Raman scattering enhancement, which have gradually increased people's demand for manipulating metal particles. However, due to the high absorption and high scattering characteristics of metal particles, in traditional laser optical tweezers, metal particles (especially mesoscopic size metal particles on the order of 100 nm to several microns) are often pushed away by the scattering force of the focused spot and cannot Therefore, the stable capture and manipulation of metal particles is still an urgent problem to be solved. [0003] Microscopic particles are usually affected by two kinds of forces in th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21K1/00
CPCG21K1/00
Inventor 袁小聪闵长俊张聿全沈军峰朱思伟
Owner 深圳市深光谷科技有限公司
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