阅读说明：本技术 一种光学式磁场探测器 (Optical magnetic field detector ) 是由 不公告发明人 于 2020-07-31 设计创作，主要内容包括：本发明提供了一种光学式磁场探测器,空腔形贵金属结构周期性地置于衬底上,空腔形贵金属结构内部设有空腔,在空腔形贵金属结构的顶部设有开口,磁致伸缩材料填充空腔,光源发射的连续谱光照射空腔形贵金属结构,光探测器接收透射光谱,在待测磁场作用下,磁致伸缩材料伸长,改变透射光谱,根据所测透射光谱实现磁场探测。在本发明中,开口的宽度严重地影响空腔形贵金属结构的表面等离激元共振,所以本发明具有磁场探测灵敏度高的优点。(The invention provides an optical magnetic field detector, wherein a cavity-shaped noble metal structure is periodically arranged on a substrate, a cavity is arranged in the cavity-shaped noble metal structure, an opening is arranged at the top of the cavity-shaped noble metal structure, a magnetostrictive material fills the cavity, continuous spectrum light emitted by a light source irradiates the cavity-shaped noble metal structure, the optical detector receives a transmission spectrum, the magnetostrictive material extends under the action of a magnetic field to be detected, the transmission spectrum is changed, and magnetic field detection is realized according to the measured transmission spectrum. In the invention, the width of the opening seriously influences the surface plasmon resonance of the cavity-shaped noble metal structure, so the invention has the advantage of high magnetic field detection sensitivity.)

1. An optical magnetic field sensor, comprising: the magnetic field detection device comprises a light source, a light detector, a substrate, a cavity-shaped noble metal structure and a magnetostrictive material, wherein the cavity-shaped noble metal structure is periodically arranged on the substrate, a cavity is arranged in the cavity-shaped noble metal structure, an opening is arranged at the top of the cavity-shaped noble metal structure, the magnetostrictive material fills the cavity, continuous spectrum light emitted by the light source irradiates the cavity-shaped noble metal structure, the light detector receives a transmission spectrum, the magnetostrictive material extends under the action of a magnetic field to be detected, the transmission spectrum is changed, and magnetic field detection is realized according to the measured transmission spectrum.

2. An optical magnetic field sensor as claimed in claim 1, wherein: the width of the opening is less than the width of the cavity.

3. An optical magnetic field sensor as claimed in claim 2, wherein: the opening is not disposed at a central location of a top of the cavity-shaped noble metal structure.

4. An optical magnetic field sensor according to claim 3, wherein: and at the opening, the cavity-shaped noble metal structure becomes thinner gradually.

5. An optical magnetic field sensor according to any one of claims 1 to 4, wherein: the substrate is silicon dioxide.

6. An optical magnetic field sensor according to claim 5, wherein: the width of the opening is less than 40 nanometers.

7. The optical magnetic field sensor of claim 6, wherein: the number of the openings is two.

8. The optical magnetic field sensor of claim 7, wherein: the openings are of different sizes.

9. The optical magnetic field sensor of claim 8, wherein: the material of the cavity-shaped noble metal structure is gold, silver or platinum.

10. The optical magnetic field sensor of claim 9, wherein: the magnetostrictive material is nickel alloy, iron-based alloy and ferrite material.

Technical Field

The invention relates to the field of magnetic field detection, in particular to an optical magnetic field detector.

Background

Magnetic fields are closely related to human production and life. 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 problems, the invention provides an optical magnetic field detector which comprises a light source, a light detector, a substrate, a cavity-shaped noble metal structure and a magnetostrictive material, wherein the cavity-shaped noble metal structure is periodically arranged on the substrate, a cavity is arranged in the cavity-shaped noble metal structure, an opening is arranged at the top of the cavity-shaped noble metal structure, the magnetostrictive material fills the cavity, continuous spectrum light emitted by the light source irradiates the cavity-shaped noble metal structure, the light detector receives a transmission spectrum, the magnetostrictive material extends under the action of a magnetic field to be detected, the transmission spectrum is changed, and magnetic field detection is realized according to the measured transmission spectrum.

Further, the width of the opening is less than the width of the cavity.

Further, the opening is not provided at the center of the top of the cavity-shaped noble metal structure.

Further, the cavity-shaped noble metal structure is gradually thinned at the opening.

Further, the substrate is silicon dioxide.

Further, the width of the opening is less than 40 nanometers.

Further, there are two openings.

Further, the openings vary in size.

Furthermore, the material of the cavity-shaped noble metal structure is gold, silver or platinum.

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

The invention has the beneficial effects that: the invention provides an optical magnetic field detector, wherein a cavity-shaped noble metal structure is periodically arranged on a substrate, a cavity is arranged in the cavity-shaped noble metal structure, an opening is arranged at the top of the cavity-shaped noble metal structure, a magnetostrictive material fills the cavity, continuous spectrum light emitted by a light source irradiates the cavity-shaped noble metal structure, the optical detector receives a transmission spectrum, the magnetostrictive material extends under the action of a magnetic field to be detected, the transmission spectrum is changed, and magnetic field detection is realized according to the measured transmission spectrum. In the invention, the width of the opening seriously influences the surface plasmon resonance of the cavity-shaped noble metal structure, so the invention has the advantage of high magnetic field detection sensitivity.

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

Drawings

Fig. 1 is a schematic view of an optical magnetic field detector.

Fig. 2 is a schematic view of yet another optical magnetic field detector.

In the figure: 1. a substrate; 2. a cavity-shaped noble metal structure; 3. an opening; 4. a magnetostrictive material.

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.