阅读说明：本技术 一种基于太赫兹波段磁光光谱的铬基尖晶石测试系统 (Chromium-based spinel test system based on terahertz waveband magneto-optical spectrum ) 是由 张朋 于 2021-10-11 设计创作，主要内容包括：本发明公开了一种基于太赫兹波段磁光光谱的铬基尖晶石测试系统,包括超导磁体和可旋转样品架,所述可旋转样品架安装在超导磁体的中部,在超导磁体的左侧和右侧分别设有太赫兹偏振调节模块和太赫兹探测模块,所述超导磁体的上侧和下侧均设有反射板。本发明通过设有的超导磁体、水平光学窗口、垂直光学窗口、太赫兹偏振调节模块和太赫兹探测模块,可以探测太赫兹波矢、偏振、磁场方向和待测样品晶向的多种参数组合模式下待测样品材料磁电耦合的微观机理,调节太赫兹波的强度,同时可以确定所需的太赫兹入射光角度,有利于最大效率探测太赫兹分量。(The invention discloses a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum, which comprises a superconducting magnet and a rotatable sample rack, wherein the rotatable sample rack is arranged in the middle of the superconducting magnet, a terahertz polarization adjusting module and a terahertz detecting module are respectively arranged on the left side and the right side of the superconducting magnet, and reflecting plates are respectively arranged on the upper side and the lower side of the superconducting magnet. According to the invention, by the aid of the superconducting magnet, the horizontal optical window, the vertical optical window, the terahertz polarization adjusting module and the terahertz detection module, a microscopic mechanism of magnetoelectric coupling of a sample material to be detected under a multi-parameter combination mode of terahertz wave vector, polarization, magnetic field direction and crystal orientation of the sample to be detected can be detected, the intensity of terahertz wave is adjusted, meanwhile, the required terahertz incident light angle can be determined, and detection of terahertz components is facilitated at maximum efficiency.)

1. The utility model provides a chromium base spinel test system based on terahertz wave band magneto-optical spectroscopy, includes superconducting magnet (1) and rotatable sample frame (2), its characterized in that: rotatable sample frame (2) is installed in the middle part of superconducting magnet (1), is equipped with terahertz polarization adjusting module (3) and terahertz detection module (4) on the left side and the right side of superconducting magnet (1) respectively, and has all seted up high adjusting module (5) at the downside of terahertz polarization adjusting module (3) and terahertz detection module (4), the upside and the downside of superconducting magnet (1) all are equipped with reflecting plate (6), and all are equipped with angle adjusting module (7) in reflecting plate (6) outside, horizontal optical window (8) have been seted up to the left end and the right-hand member middle part symmetry of superconducting magnet (1), and vertical optical window (9) have been seted up to the upper end and the lower extreme middle part symmetry of superconducting magnet (1).

2. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: the central point of the horizontal optical window (8) and the central point of the rotatable sample holder (2) are on the same straight line.

3. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: the central point of the vertical optical window (9), the central point of the rotatable sample holder (2) and the central point of the reflecting plate (6) are on the same straight line.

4. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: the terahertz polarization adjusting module (3) is composed of two metal wire grid polarizers capable of rotating independently and a connecting frame, the centers of the two metal wire grid polarizers capable of rotating independently are on the same horizontal line, and the height adjusting module (5) is arranged on the lower side of the connecting frame of the terahertz polarization adjusting module (3).

5. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: terahertz detection module (4) comprises the metal wire grid polarizer that is located rotatable on the left side and the metal wire grid polarizer that is located the right side and fixed and connection frame, height adjusting module (5) set up the connection frame downside at terahertz detection module (4).

6. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: the rotatable metal wire grid polarizer positioned on the left side in the terahertz detection module (4) has two configuration states, wherein one configuration state is that the metal wire grid of the metal wire grid polarizer forms a 45-degree included angle with the central plane of the polarizer, and the metal wire grid in the other configuration state is perpendicular to the distribution direction of the metal wire grid in the first configuration state.

7. The chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum of claim 1, wherein: the rotatable metal wire grid polarizer on the right side in the terahertz detection module (4) has two configuration states, wherein one configuration state is that the metal wire grids of the metal wire grid polarizer are distributed in a horizontal state, and the other configuration state is that the metal wire grids of the metal wire grid polarizer are distributed in a vertical state.

Technical Field

The invention relates to the field of chromium-based spinel materials, in particular to a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum.

Background

The chromium-based spinel material has various physical characteristics such as magnetic resistance, multiferroic property and various magnetic orders, and has important theory and application value, a high magnetic field spectrum technology based on a Fourier change spectrometer or a back wave oscillator is a common experimental method for detecting terahertz waveband high-frequency spin resonance, but in the actual experimental process, due to the limitation of various factors, terahertz polarization change or optical activity of an electromagnetic vibrator is difficult to obtain, and the propagation direction of a terahertz light path is fixed, so that multiple tests are required to obtain the associated information among terahertz wave vectors, polarization and magnetic field directions and sample crystal orientation in different modes, and the experiment is not facilitated.

Disclosure of Invention

The invention mainly aims to provide a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum, which can detect the micro mechanism of magnetoelectric coupling of a sample material to be tested in a multi-parameter combination mode of terahertz wave vector, polarization, magnetic field direction and crystal orientation of the sample to be tested through a superconducting magnet, a horizontal optical window, a vertical optical window, a terahertz polarization adjusting module and a terahertz detection module, adjust the intensity of terahertz wave, determine the required terahertz incident light angle, be beneficial to detecting terahertz components with the maximum efficiency and effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum comprises a superconducting magnet for providing low-temperature and strong-magnetic environment and a rotatable sample rack for fixing a crystal sample to be tested and adjusting the angle of the crystal sample to be tested, wherein the rotatable sample rack is arranged in the middle of the superconducting magnet, a terahertz polarization adjusting module for adjusting the intensity of terahertz waves and determining the angle of incident light and a terahertz detection module for detecting terahertz polarization are respectively arranged on the left side and the right side of the superconducting magnet, the lower sides of the terahertz polarization adjusting module and the terahertz detection module are both provided with height adjusting modules, the upper side and the lower side of the superconducting magnet are both provided with reflecting plates, and angle adjusting modules are arranged on the outer sides of the reflecting plates, horizontal optical windows are symmetrically formed in the middle of the left end and the right end of the superconducting magnet, and vertical optical windows are symmetrically formed in the middle of the upper end and the lower end of the superconducting magnet.

Furthermore, the central point of the horizontal optical window and the central point of the rotatable sample holder are on the same straight line, and the arrangement can ensure that the terahertz waves irradiate on the surface of the crystal sample to be measured.

Furthermore, the central point of the vertical optical window, the central point of the rotatable sample holder and the central point of the reflecting plate are all on the same straight line, and the arrangement can ensure that the terahertz waves irradiate on the surface of the crystal sample to be measured.

Further, the terahertz polarization adjusting module consists of two metal wire grid polarizers which can rotate independently and a connecting frame, and the centers of the two metal wire grid polarizers which can independently rotate are on the same horizontal line, when the terahertz wave passes through the polaroid of the metal wire grid polarizer, the polarized light component arranged in parallel with the metal wire grid is reflected by the metal wire grid of the polaroid, or absorbed by doing work on electrons inside the metal wire grid, polarized light components arranged perpendicular to the metal wire grid can pass through the wire grid, by rotating the metal wire grid polarizer located at the front side, can adjust the intensity of terahertz waves, can filter out unwanted polarized light by rotating the metal wire grid polarizer positioned at the rear side, therefore, incident terahertz waves are transmitted according to a required angle, and the height adjusting module is arranged on the lower side of the connecting frame of the terahertz polarization adjusting module.

Further, the terahertz detection module is composed of a metal wire grid polarizer which is positioned on the left side and a metal wire grid polarizer which is positioned on the right side and is fixed, and a connecting frame, and the height adjusting module is arranged on the lower side of the connecting frame of the terahertz detection module.

Furthermore, the rotatable metal wire grid polarizer positioned on the left side of the terahertz detection module has two configuration states, wherein one configuration state is that the metal wire grid of the metal wire grid polarizer forms a 45-degree included angle with the central plane of the polarizer, the metal wire grid in the other configuration state is perpendicular to the distribution direction of the metal wire grid in the first configuration state, and two terahertz electric field components which are perpendicular to each other, namely plane terahertz polarization, are obtained through the arrangement.

Furthermore, the rotatable metal wire grid polarizer on the right side in the terahertz detection module has two configuration states, wherein one configuration state is that the metal wire grids of the metal wire grid polarizer are distributed in a horizontal state, and the other configuration state is that the metal wire grids of the metal wire grid polarizer are distributed in a vertical state, so that the terahertz component can be detected with the maximum efficiency.

Further, the use steps of the system are as follows:

fixing a crystal sample to be detected in the middle of a rotatable sample frame, moving the rotatable sample frame into the superconducting magnet, and adjusting the position of the crystal sample to be detected to enable the crystal sample to be detected to be located at the central connecting line of a horizontal optical window and a vertical optical window;

adjusting a rotatable metal wire grid polarizer positioned on the left side in the terahertz detection module to be in a first configuration state, adjusting the intensity of terahertz waves and determining the angle of required incident light by rotating two independently rotatable metal wire grid polarizers of the terahertz polarization adjustment module, so that the terahertz waves irradiated on the crystal sample to be detected are incident according to the calculated angle value;

starting equipment to generate terahertz pulses, wherein the terahertz pulses sequentially pass through the terahertz polarization adjusting module, the crystal sample to be detected and the terahertz detecting module, and required spectral data are acquired through relevant equipment;

step four, adjusting the angle of the crystal sample to be measured through a rotatable sample frame, repeating the step two and the step three, and obtaining required spectral data through related equipment, wherein the operation is to obtain the relation between the crystal direction of the sample to be measured and the terahertz wave vector, the polarization and the magnetic field direction on the premise that the terahertz wave is parallel to the magnetic field;

and fifthly, adjusting the positions of the terahertz polarization adjusting module and the terahertz detection module through the height adjusting module, enabling the center of the metal wire grid polarizer of the terahertz polarization adjusting module and the reflecting plate positioned on the upper side of the superconducting magnet to be on the same horizontal line, enabling the metal wire grid polarizer of the terahertz detection module and the reflecting plate positioned on the lower side of the superconducting magnet to be on the same horizontal line, adjusting the inclination angles of the reflecting plates on the two sides through the angle adjusting module, enabling the terahertz wave to irradiate the surface of the sample to be detected, and repeating the second step, the third step and the fourth step.

The invention has the following beneficial effects:

compared with the prior art, the superconducting magnet, the horizontal optical window, the vertical optical window, the height adjusting module and the angle adjusting module are arranged, so that two geometrically configured light paths with magnetic fields perpendicular to and parallel to the terahertz light propagation direction can be designed by utilizing the horizontal optical window and the vertical optical window of the low-temperature superconducting magnet, and the micro mechanism of magnetoelectric coupling of the sample material to be detected under the multi-parameter combination mode of terahertz wave vector, polarization, magnetic field direction and crystal orientation of the sample to be detected is convenient to detect;

compared with the prior art, when terahertz waves pass through a polaroid of a metal wire grid polarizer, polarized light components arranged in parallel to the metal wire grid are reflected by the metal wire grid of the polaroid or absorbed due to acting on electrons in the metal wire grid, the polarized light components arranged perpendicular to the metal wire grid can pass through the wire grid, and the terahertz polarization adjusting modules of the two metal wire grid polarizers capable of rotating independently are arranged on the front side of a sample, so that the intensity of the terahertz waves can be adjusted, and meanwhile, the required terahertz incident light angle can be determined;

compared with the prior art, the terahertz detection module is arranged, the configuration state of the metal wire grid polarizer in the terahertz detection module can be adjusted according to the crystal orientation and the detection light polarization of the detection crystal in actual measurement, the terahertz component can be detected at the maximum efficiency, and two terahertz electric field components which are perpendicular to each other, namely plane terahertz polarization, are obtained.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the technical description of the present invention will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a schematic diagram of the overall structure of a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum;

FIG. 2 is an optical schematic diagram of a terahertz detection module of a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum in a configuration state according to the invention;

FIG. 3 is an optical schematic diagram of a terahertz detection module of a chromium-based spinel testing system based on terahertz waveband magneto-optical spectrum in another configuration state;

fig. 4 is a schematic diagram of the operating principle of a metal wire grid polarizer.

In the figure: 1. a superconducting magnet; 2. a rotatable sample holder; 3. a terahertz polarization adjustment module; 4. a terahertz detection module; 5. a height adjustment module; 6. a reflective plate; 7. an angle adjustment module; 8. a horizontal optical window; 9. perpendicular to the optical window.

Detailed Description

The present invention will be further described with reference to the following detailed description, wherein the drawings are for illustrative purposes only and are not intended to be limiting, wherein certain elements may be omitted, enlarged or reduced in size, and are not intended to represent the actual dimensions of the product, so as to better illustrate the detailed description of the invention.

Example 1

As shown in fig. 1-3, a chromium-based spinel test system based on terahertz waveband magneto-optical spectrum, including superconducting magnet 1 and rotatable sample frame 2, rotatable sample frame 2 is installed at the middle part of superconducting magnet 1, left side and right side at superconducting magnet 1 are equipped with terahertz respectively and are polarized adjusting module 3 and terahertz detect module 4 now, and at terahertz polarization adjusting module 3 and terahertz detect module 4's downside all seted up height adjusting module 5 now, the upside and the downside of superconducting magnet 1 all are equipped with reflecting plate 6, and the reflecting plate 6 outside all is equipped with angle adjusting module 7, horizontal optical window 8 has been seted up to the left end and the right-hand member middle part symmetry of superconducting magnet 1, and vertical optical window 9 has been seted up to the upper end and the lower extreme middle part symmetry of superconducting magnet 1.

The centre point of the horizontal optical window 8 is collinear with the centre point of the rotatable sample holder 2.

By adopting the technical scheme: the optical paths with two geometric configurations of the magnetic field vertical and parallel to the terahertz light propagation direction can be designed by utilizing the horizontal optical window 8 and the vertical optical window 9 of the low-temperature superconducting magnet 1, when the terahertz polarization adjusting module 3 and the terahertz detecting module 4 are on the same horizontal line with the horizontal optical window 8 of the superconducting magnet 1, the inclination angle of a crystal sample to be detected can be adjusted by adjusting the rotatable sample holder 2, and therefore the micro mechanism of magnetoelectric coupling of the sample material to be detected can be detected in the state that the magnetic field direction is parallel to the terahertz wave direction.

Example 2

As shown in fig. 1-3, a chromium-based spinel test system based on terahertz waveband magneto-optical spectrum, including superconducting magnet 1 and rotatable sample frame 2, rotatable sample frame 2 is installed at the middle part of superconducting magnet 1, left side and right side at superconducting magnet 1 are equipped with terahertz respectively and are polarized adjusting module 3 and terahertz detect module 4 now, and at terahertz polarization adjusting module 3 and terahertz detect module 4's downside all seted up height adjusting module 5 now, the upside and the downside of superconducting magnet 1 all are equipped with reflecting plate 6, and the reflecting plate 6 outside all is equipped with angle adjusting module 7, horizontal optical window 8 has been seted up to the left end and the right-hand member middle part symmetry of superconducting magnet 1, and vertical optical window 9 has been seted up to the upper end and the lower extreme middle part symmetry of superconducting magnet 1.

The center point of the vertical optical window 9 is collinear with both the center point of the rotatable sample holder 2 and the center point of the reflector plate 6.

By adopting the technical scheme: the installation heights of the terahertz polarization adjusting module 3 and the terahertz detection module 4 are adjusted by the height adjusting module 5, the height adjusting module 5 can be composed of a linear guide rail and a control system thereof, the optical center of the terahertz polarization adjusting module 3 and the center of the reflecting plate 6 positioned on the upper side of the superconducting magnet 1 are on the same horizontal line, the optical center of the terahertz detection module 4 and the center of the reflecting plate 6 positioned on the lower side of the superconducting magnet 1 are on the same horizontal line, the inclination angles of the two reflecting plates 6 are adjusted by the angle adjusting module 7, the angle adjusting module 7 can be composed of a stepping motor and a control system thereof, at the moment, a light path is reflected by the reflecting plate 6 on the upper side and then is emitted by the vertical optical window 9 on the upper end of the superconducting magnet 1, passes through a sample crystal to be detected, is emitted by the vertical optical window 9 on the lower side of the superconducting magnet 1, and then enters the terahertz detection module 4 after being reflected by the reflecting plate 6, at the moment, the terahertz wave direction is vertical to the magnetic field direction, the inclination angle of the crystal sample to be detected can be adjusted by adjusting the rotatable sample holder 2, and therefore the micro mechanism of magnetoelectric coupling of the sample material to be detected can be detected when the state that the magnetic field direction is vertical to the terahertz wave direction.

Example 3

As shown in fig. 1-3, a chromium-based spinel test system based on terahertz waveband magneto-optical spectrum, including superconducting magnet 1 and rotatable sample frame 2, rotatable sample frame 2 is installed at the middle part of superconducting magnet 1, left side and right side at superconducting magnet 1 are equipped with terahertz respectively and are polarized adjusting module 3 and terahertz detect module 4 now, and at terahertz polarization adjusting module 3 and terahertz detect module 4's downside all seted up height adjusting module 5 now, the upside and the downside of superconducting magnet 1 all are equipped with reflecting plate 6, and the reflecting plate 6 outside all is equipped with angle adjusting module 7, horizontal optical window 8 has been seted up to the left end and the right-hand member middle part symmetry of superconducting magnet 1, and vertical optical window 9 has been seted up to the upper end and the lower extreme middle part symmetry of superconducting magnet 1.

The terahertz polarization adjusting module 3 is composed of two metal wire grid polarizers capable of rotating independently and a connecting frame, the centers of the two metal wire grid polarizers capable of rotating independently are on the same horizontal line, and the height adjusting module 5 is arranged on the lower side of the connecting frame of the terahertz polarization adjusting module 3.

Terahertz detection module 4 comprises the metal wire grid polarizer that is located rotatable on the left side and the metal wire grid polarizer that is located the right side and fixes and connection frame, and height adjustment module 5 sets up the connection frame downside at terahertz detection module 4.

The rotatable metal wire grid polarizer positioned on the left side in the terahertz detection module 4 has two configuration states, wherein one configuration state is that the metal wire grid of the metal wire grid polarizer forms an included angle of 45 degrees with the central plane of the over-polarizer, and the metal wire grid in the other configuration state is perpendicular to the distribution direction of the metal wire grid in the first configuration state.

The rotatable metal wire grid polarizer on the right side in the terahertz detection module 4 has two configuration states, one is that the metal wire grids of the metal wire grid polarizer are distributed in a horizontal state, and the other is that the metal wire grids of the metal wire grid polarizer are distributed in a vertical state.

By adopting the technical scheme: through the arranged terahertz polarization adjusting module 3 and the terahertz detecting module 4, when terahertz waves pass through the polaroid of the metal wire grid polarizer, polarized light components arranged in parallel to the metal wire grid are reflected by the metal wire grid of the polaroid or absorbed due to acting on electrons in the metal wire grid, the polarized light components arranged perpendicular to the metal wire grid can pass through the wire grid, the terahertz polarization adjusting module 3 of the two metal wire grid polarizers capable of rotating independently is arranged on the front side of a sample, not only can the intensity of the terahertz waves be adjusted, but also the required terahertz incident light angle can be determined, meanwhile, the configuration state of the metal wire grid polarizer in the terahertz detecting module 4 can be adjusted according to the crystal orientation and the detecting light polarization of a detecting crystal in actual measurement, the terahertz components can be detected with the maximum efficiency, and two terahertz electric field components which are perpendicular to each other can be obtained, i.e. planar terahertz polarization.

When the system is used, a crystal sample to be detected is fixed in the middle of the rotatable sample frame 2, the rotatable sample frame 2 is moved into the superconducting magnet 1, the position of the crystal sample to be detected is adjusted, the crystal sample to be detected is located at the central connecting line of the horizontal optical window 8 and the vertical optical window 9, the rotatable metal wire grid polarizer located on the left side in the terahertz detection module 4 is adjusted to be in a first configuration state, the intensity of terahertz waves is adjusted and the angle of required incident light is determined by rotating the two independently rotatable metal wire grid polarizers of the terahertz polarization adjusting module 3, the terahertz waves irradiated on the crystal sample to be detected are incident according to the calculated angle value, equipment is started to generate terahertz pulses, and the terahertz pulses sequentially pass through the terahertz polarization adjusting module 3, A crystal sample to be tested and the terahertz detection module 4 acquire required spectral data through related equipment, the angle of the crystal sample to be measured is adjusted by rotating the sample holder 2, the second step and the third step are repeated, the required spectral data is obtained by related equipment, the positions of the terahertz polarization adjusting module 3 and the terahertz detection module 4 are adjusted by the height adjusting module 5, so that the center of the metal wire grid polarizer of the terahertz polarization adjusting module 3 and the reflecting plate 6 positioned on the upper side of the superconducting magnet 1 are on the same horizontal line, and the metal wire grid polarizer of the terahertz detection module 4 and the reflecting plate 6 at the lower side of the superconducting magnet 1 are on the same horizontal line, and adjusting the inclination angles of the reflecting plates 6 at the two sides through the angle adjusting module 7, so that the terahertz light waves can be irradiated on the surface of the sample to be measured, and repeating the second step, the third step and the fourth step.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.