Surface plasmon wave length selecting device

A surface plasmon and wavelength selection technology, applied in the field of optical measurement, can solve the problems of unsuitable surface plasmon components and large size, and achieve the effect of simple structure, small scale and favorable integration

Inactive Publication Date: 2013-07-03
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, traditional wavelength selective devices require a relatively large size, and th

Method used

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  • Surface plasmon wave length selecting device
  • Surface plasmon wave length selecting device
  • Surface plasmon wave length selecting device

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 As shown, in this embodiment, a single row of metal pillars 2 is vertically arranged on the substrate 1. This metal pillar structure has obvious wavelength selectivity to the reflection of surface plasmons, forming a surface plasmon wavelength selective sex mirror. The metal pillars are composed of silver metal pillars with a radius of 200nm. The central projection points of a single row of silver metal pillars can be connected into a line segment, and the distance between every two adjacent silver metal pillars is 400nm. This surface plasmon wavelength selective device has good reflection characteristics. When a wide plane wave light source is perpendicular to the substrate, the far-field reflection angle-wavelength reflection spectrum generated is as follows: figure 2 shown. In particular, under the above incident conditions, the far-field reflection intensity at zero-degree angle varies with wavelength as image 3 As shown, there is an obvious de...

Embodiment 2

[0025] Such as Figure 4 As shown, in this embodiment, double rows of metal pillars 2 are vertically arranged on the substrate 1. This kind of metal pillar structure has obvious wavelength selectivity to the reflection of surface plasmons, forming a surface plasmon wavelength selective sex mirror. The metal pillars are composed of silver metal pillars with a radius of 200nm. The projection of each row of silver metal pillars can be connected into a line segment, and the distance between every two adjacent silver metal pillars in the same row is 800nm; between two rows of silver metal pillars The pitch is 400nm. This surface plasmon wavelength selective device has special reflection characteristics. When a wide approximate plane wave surface plasmon source is incident perpendicular to the connection line of metal pillars, the resulting reflection angle-wavelength far-field reflection spectrum is as follows: Figure 5 As shown, both the zero-order reflection intensity and the ...

Embodiment 3

[0027] Such as Figure 6 As shown, in this embodiment, 12 metal pillars are vertically arranged on the substrate, and the connection line of the central projection point is two concentric hexagons, forming a closed regular figure and forming a plasmonic nanoresonator . 12 silver metal pillars with a radius of 200nm form an inner and outer two-layer structure. The lines connecting the projection centers of the inner and outer silver metal pillars respectively form a regular hexagon. These two regular hexagons have the same center, and the inner layer The side length of the regular hexagon is 800 nm, and the side length of the regular hexagon in the outer layer is 1100 nm. This surface plasmon nano-resonator has good locality, and the surface plasmon resonates in the resonator to form multiple modes.

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Abstract

The invention discloses a surface plasmon wave length selecting device. The wave length selecting device comprises a substrate and metal posts, wherein the substrate is made of metal; at least two metal posts are vertically arranged on the substrate; the diameter d of the metal posts is from 100 nanometers to 2 micrometers; the height of the metal posts is equal to or larger than 50 nanometers; and the surface plasmons are transmitted along the surface of the substrate, and form a locally intensified electromagnetic field close to the metal post, so as to be reflected or transmitted at different selective wavelengths in virtue of the characteristics of a single metal post and the resonance of various metal posts. The surface plasmon wave length selecting device adopting the structure not only can favorably reflect, transmit and scatter the surface plasmons at selective wavelengths, but also has simple structure, small dimension, and unique advantage of being easy for integration, and is low in cost.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a surface plasmon wavelength selection device. Background technique [0002] Surface plasmon SP (Surface Plasmon) is an electromagnetic field surface mode propagating on the interface between metal and medium. Its characteristics are mainly that the electromagnetic field localizes on the surface of the metal to form an evanescent field and propagates along the metal surface. Under certain conditions, energy conversion can be achieved between light and surface plasmons, which allows people to use surface plasmons to manipulate light in the range of micrometers or even nanometers, so it is generally believed that surface plasmons It will gain important applications in the field of nanophotonics. Research on various devices based on surface plasmons and related theoretical research has become a hot spot in recent years, attracting the attention of many researchers. [...

Claims

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Application Information

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IPC IPC(8): G02F1/01
Inventor 张家森胡闯朴硏相徐亮
Owner PEKING UNIV
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