阅读说明：本技术 一种基于局域表面等离激元共振的磁场探测器 (Magnetic field detector based on local surface plasmon resonance ) 是由 不公告发明人 于 2020-07-31 设计创作，主要内容包括：本发明提供了一种基于局域表面等离激元共振的磁场探测器,贵金属薄膜置于衬底上,贵金属薄膜的上表面设有周期排列的磁致伸缩部,光源为连续谱光源,光源发出的光照射贵金属薄膜,在贵金属薄膜上、磁致伸缩部附近形成局域表面等离激元共振,光探测器接收反射光。应用时,在待测磁场作用下,磁致伸缩部伸长,改变了贵金属薄膜上、磁致伸缩部附近的局域表面等离激元共振波长,从而改变了磁场探测器的反射光谱,根据所测反射光谱实现磁场探测。因为贵金属薄膜上、磁致伸缩部附近的局域表面等离激元共振对磁致伸缩部的形貌非常敏感,所以本发明具有磁场探测灵敏度高的优点。(The invention provides a magnetic field detector based on localized surface plasmon resonance, wherein a noble metal film is arranged on a substrate, the upper surface of the noble metal film is provided with periodically arranged magnetostriction parts, a light source is a continuous spectrum light source, the light emitted by the light source irradiates the noble metal film to form localized surface plasmon resonance on the noble metal film and near the magnetostriction parts, and a light detector receives reflected light. When the device is applied, under the action of a magnetic field to be detected, the magnetostrictive part extends, and the local surface plasmon resonance wavelength on the noble metal film and near the magnetostrictive part is changed, so that the reflection spectrum of the magnetic field detector is changed, and the magnetic field detection is realized according to the measured reflection spectrum. The invention has the advantage of high magnetic field detection sensitivity because the local surface plasmon resonance on the noble metal film and near the magnetostrictive part is very sensitive to the shape of the magnetostrictive part.)

1. A magnetic field probe based on localized surface plasmon resonance, comprising: the magnetic field detection device comprises a light source, a light detector, a substrate, a noble metal film and a magnetostrictive part, wherein the noble metal film is arranged on the substrate, the magnetostrictive part is arranged on the upper surface of the noble metal film in a periodic mode, the light source is a continuous spectrum light source, light emitted by the light source irradiates the noble metal film, the light detector receives reflected light, and magnetic field detection is achieved according to the measured reflection spectrum.

2. The local surface plasmon resonance-based magnetic field detector of claim 1 wherein: the magnetostrictive part is a cuboid.

3. The local surface plasmon resonance-based magnetic field detector of claim 1 wherein: the magnetostrictive portion is spherical.

4. The local surface plasmon resonance-based magnetic field detector of claim 1 wherein: the magnetostrictive part is spherical shell-shaped.

5. The local surface plasmon resonance-based magnetic field detector of any of claims 1-4, wherein: and pits are arranged on the noble metal film and at the bottom of the magnetostrictive part.

6. The local surface plasmon resonance-based magnetic field detector of claim 5 wherein: the pits penetrate through the noble metal film.

7. The local surface plasmon resonance-based magnetic field detector of claim 6 wherein: the material of the noble metal film is gold, silver and platinum.

8. The local surface plasmon resonance-based magnetic field detector of claim 7 wherein: the thickness of the noble metal film is less than 200 nanometers.

9. The local surface plasmon resonance-based magnetic field detector of claim 8 wherein: the width of the pits is less than 40 nanometers.

10. The local surface plasmon resonance-based magnetic field detector of claim 9 wherein: the magnetostrictive part is made of nickel alloy, iron-based alloy and ferrite material.

Technical Field

The invention relates to the field of magnetic field detection, in particular to a magnetic field detector based on local surface plasmon resonance.

Background

The conventional magnetic field detection is mostly based on the hall effect, the magnetoresistance effect, the fluxgate effect and the tunneling effect. The traditional magnetic field detection has low sensitivity and cannot meet the requirement of high-sensitivity magnetic field detection. The magnetic field detection scheme based on a new principle is explored, and the magnetic field detection sensitivity is improved.

Disclosure of Invention

In order to solve the above problems, the present invention provides a magnetic field detector based on localized surface plasmon resonance, comprising: the magnetic field detection device comprises a light source, a light detector, a substrate, a noble metal film and a magnetostrictive part, wherein the noble metal film is arranged on the substrate, the magnetostrictive part is arranged on the upper surface of the noble metal film in a periodic mode, the light source is a continuous spectrum light source, light emitted by the light source irradiates the noble metal film, the light detector receives reflected light, and magnetic field detection is achieved according to the measured reflection spectrum.

Further, the magnetostrictive portion is a rectangular parallelepiped.

Further, the magnetostrictive portion is spherical.

Further, the magnetostrictive portion is spherical shell shaped.

Furthermore, a concave pit is arranged on the noble metal film and at the bottom of the magnetostrictive part.

Further, the pits penetrate the noble metal thin film.

Furthermore, the material of the noble metal film is gold, silver or platinum.

Still further, the noble metal film has a thickness of less than 200 nm.

Still further, the width of the pits is less than 40 nanometers.

Furthermore, the material of the magnetostrictive part is nickel alloy, iron-based alloy, ferrite material.

The invention has the beneficial effects that: the invention provides a magnetic field detector based on localized surface plasmon resonance, wherein a noble metal film is arranged on a substrate, the upper surface of the noble metal film is provided with periodically arranged magnetostriction parts, a light source is a continuous spectrum light source, the light emitted by the light source irradiates the noble metal film to form localized surface plasmon resonance on the noble metal film and near the magnetostriction parts, and a light detector receives reflected light. When the device is applied, under the action of a magnetic field to be detected, the magnetostrictive part extends, and the local surface plasmon resonance wavelength on the noble metal film and near the magnetostrictive part is changed, so that the reflection spectrum of the magnetic field detector is changed, and the magnetic field detection is realized according to the measured reflection spectrum. The invention has the advantage of high magnetic field detection sensitivity because the local surface plasmon resonance on the noble metal film and near the magnetostrictive part is very sensitive to the shape of the magnetostrictive part.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of a magnetic field detector based on surface plasmon resonance.

Fig. 2 is a schematic diagram of yet another magnetic field detector based on surface plasmon resonance.

Fig. 3 is a schematic diagram of yet another magnetic field detector based on surface plasmon resonance.

Fig. 4 is a schematic diagram of yet another magnetic field detector based on surface plasmon resonance.

In the figure: 1. a substrate; 2. a noble metal thin film; 3. a magnetostrictive portion; 4. and (4) pits.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.