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A high numerical aperture oil-immersed surface plasmon metalens

A surface plasmon, high numerical aperture technology, applied in the field of optics, can solve the problems of numerical aperture dependence, high difficulty to get out, and cost dependence, and achieve the effects of high-precision detection, cost reduction, and simple system

Inactive Publication Date: 2019-05-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the SPR structure of the oil immersion high NA microscope objective is that it can be incident at zero angle along the normal direction, so the mechanical structure is simple and easy to be compatible with other optical microscopy techniques. The disadvantage is that this technique is heavily dependent on the numerical aperture and the cost is extremely high
The present invention proposes a SPR special-purpose excitation metalens with high NA similar to the oil-immersion microscope objective lens, which can adopt the characteristics of zero-angle incidence, and high numerical aperture that does not have requirements on magnification, aberration, working distance, etc. , to solve the current high-resolution SPR system's extreme dependence on NA and the high cost that makes it difficult to get out of the laboratory and realize industrialization

Method used

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  • A high numerical aperture oil-immersed surface plasmon metalens
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  • A high numerical aperture oil-immersed surface plasmon metalens

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specific Embodiment approach 1

[0035] Embodiment 1: The present invention provides a surface plasmon metalens with high numerical aperture, which can be applied to the coupling and detection of surface plasmons. combine figure 1 and image 3 Illustrate the specific embodiment, a kind of high numerical aperture surface plasmon superlens described in the present invention is made up of two optical surfaces, and one of them is the aspheric surface that the present invention designs, and one is optical plane, and its shape is circular , the metalens is symmetrical about the central axis of its own circular plane.

[0036] Such as figure 1 As shown in , take the vertex of the surface boundary of the plasmonic metalens as the origin, the tangent line of the vertex is the x-axis, and the central axis of the metalens is the y-axis to establish a plane Cartesian coordinate system, and the radius r of the plasmonic metalens max Divided into 2m-2 parts, recorded as r(2m-2), θ is the angle between the corresponding ...

specific Embodiment approach 2

[0047] Specific embodiment two: an optical coupling metalens, its structure is as described in claim one, it is applied to Figure 4 When used in the surface plasmon optical detection system shown, its characteristics are as follows:

[0048]The system consists of an illumination system (1), a detection system (2), a beam splitter (3), a plasma metalens (401), matching oil (402), a surface plasmon sensor chip (403), and a sample to be tested (404) composition.

[0049] The surface plasmon sensing chip (403) is placed on the optical plane of the surface plasmon metalens, with matching oil (402) between them, and the sample to be tested (404) is placed on the surface plasmon sensing chip.

[0050] After the light beam emitted by the illumination system (1) is split by the beam splitter, when it is incident on the surface plasmon optical coupling metalens, after passing through the double refraction of the aspheric surface of the metal lens and the matching oil layer, the light ...

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Abstract

The invention proposes an oil-immersed surface plasmon resonance (SPR) superlens with a high numerical aperture. One side of the superlens is a special optical aspheric surface whose surface topography is designed by the invention, and the other side is an optical plane. The coupling lens is in axial symmetry in a normal direction of the center of the optical plane, and the cross section parallel to the optical plane of the lens is circular. The coupling lens is made of material with a high index of refraction which is transparent to visible light, parallel light enters the lens in parallelism with an optical axis from one side of the optical aspheric surface, and through refraction by the special optical aspheric surface and a matching oil layer, the parallel light is focused on the focal point of the superlens. When the numerical aperture of the coupling superlens is larger than 1.05, the superlens can be used for exciting surface plasma. The oil-immersed surface plasmon resonance (SPR) superlens with a high numerical aperture can serve as an effective substitute of an oil-immersed microobjective with a high numerical aperture, and has the advantages of simple structure, low cost, definable working distance and the like.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an oil-immersed surface plasmon superlens with a high numerical aperture. Background technique [0002] Surface plasmon (Surface Plasmon Resonance, SPR) is a kind of surface electromagnetic wave propagating on the interface between metal and dielectric. The electric field intensity at the metal / dielectric interface is the largest and decays exponentially in the normal direction perpendicular to the interface. The wave vector of the surface plasmon wave is larger than the light wave vector under vacuum conditions, so it is usually necessary to use other means to match the wave vector to excite SPR. The commonly used SPR coupling methods include electronic coupling, grating coupling, and the most widely used Kretschmann prism structure, and the "sandwich-like" multilayer structure coupling developed on the Kretschmann prism structure. The current high-resolution SPR coupling stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00G02B21/33
CPCG02B5/008G02B21/33
Inventor 张蓓荆嘉玮赵子琦刘雨闫鹏
Owner BEIHANG UNIV