Optical tweezers device based on surface plasmon lens

A surface plasmon and lens technology, applied in the field of integrated optics, can solve problems such as limited optical gradient force, increased radiation pressure, and inability to capture particles stably, achieving the effect of facilitating expansion and good integration

Pending Publication Date: 2022-06-24
NANJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, when the particle diameter is small, the optical gradient force acting on the particle is very limited, and the radiation pressure is relatively increased, which cannot stably trap the particle

Method used

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  • Optical tweezers device based on surface plasmon lens
  • Optical tweezers device based on surface plasmon lens
  • Optical tweezers device based on surface plasmon lens

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Embodiment Construction

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like figure 1 As shown, the present invention discloses an optical tweezers device based on a surface plasmon lens, the optical tweezers device comprises a substrate, a metal layer, a grating and a semi-elliptical cylindrical lens arranged above the grating; the grating is etched on the metal layer; When the incident light is perpendicular to the grating from the substrate, the surface plasmons are excited between the metal layer and the semi-elliptical cylindrical lens; a pair of counter-propagating surface plasmons form interference fringes, so that the surface plasmon The center of the lens forms a surface plasmon enhancement spot.

[0028] That is, the optical tweezers device can form an interference field to trap and move nanoparti...

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Abstract

The invention provides an optical tweezer device based on a surface plasmon lens. The optical tweezer device comprises a substrate, a metal layer, a grating and a semi-elliptic cylindrical lens arranged above the grating. The grating is etched on the metal layer; when incident light vertically enters the grating from the substrate, surface plasmons are formed through excitation between the metal layer and the semi-elliptic cylindrical lens. And the pair of surface plasmons propagating in the back direction form interference fringes so as to form a surface plasmon enhancement point in the center of the semi-elliptic cylindrical lens with the surface plasmons. According to the optical tweezers device based on the surface plasmon lens, limitation of light energy in a sub-wavelength range is achieved, and particles can be controlled with higher spatial accuracy while the local electric field intensity is improved to capture the particles.

Description

technical field [0001] The invention relates to an optical tweezers device based on a surface plasmon lens, belonging to the field of integrated optics. Background technique [0002] Optical trapping, also known as optical tweezers, refers to a technique that uses light scattering to hold micro- and nano-sized objects in place at a specific location. In 1987, Arthur Ashkin et al. first applied optical tweezers to biology, successfully capturing single tobacco mosaic virus, Escherichia coli, and living cells. Compared with other conventional mechanical tweezers, optical tweezers can capture and manipulate whole particles in a non-direct contact and damage-free manner, which is suitable for capturing and manipulating vulnerable biological cells. In addition, optical tweezers are also widely used in many fields, such as biomolecular classification, Raman spectroscopy, super-resolution imaging technology, etc. [0003] After decades of development and research, the use of opti...

Claims

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Application Information

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IPC IPC(8): G02B5/00G02B3/06G02B5/18
CPCG02B5/008G02B3/06G02B5/1814G02B5/1866
Inventor 刘爱萍洪晶晶王琴周兴平
Owner NANJING UNIV OF POSTS & TELECOMM
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