CN114442343A - Magnetic field regulation and control type light absorption device - Google Patents
Magnetic field regulation and control type light absorption device Download PDFInfo
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- CN114442343A CN114442343A CN202210119852.7A CN202210119852A CN114442343A CN 114442343 A CN114442343 A CN 114442343A CN 202210119852 A CN202210119852 A CN 202210119852A CN 114442343 A CN114442343 A CN 114442343A
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- light absorption
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/091—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect based on magneto-absorption or magneto-reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to the technical field of light absorption, in particular to a magnetic field regulation and control type light absorption device which comprises a substrate and light absorption units arranged on the substrate periodically, wherein each light absorption unit comprises a precious metal film and a magnetic material part, the precious metal films of adjacent light absorption units are communicated, a round hole and a rectangular hole are formed in each precious metal film, the rectangular hole is formed in one side of the round hole, the rectangular part is not communicated with the round hole, and the magnetic material part is arranged in the round hole. Under the action of an external magnetic field, the refractive index of the magnetic material part changes, and the dielectric environment near the round hole is changed, so that the local surface plasmon resonance near the round hole is changed, the light absorption characteristic regulation of the micro-nano structure is realized, the absorption of incident light with different wavelengths is facilitated, and the application range of the device is widened.
Description
Technical Field
The invention relates to the technical field of light absorption, in particular to a magnetic field regulation and control type light absorption device.
Background
Light absorption refers to the physical process by which, as light enters a light absorbing material, it interacts with the light absorbing material and the electromagnetic radiation energy of the light is converted, in part, into other forms of energy. Generally, light is absorbed and then converted into heat, which is released as thermal energy, resulting in photothermal conversion.
The light absorption technology has important application in the fields of photoelectric detection, photoelectric conversion, infrared detection, hot electron generation, atmospheric environment monitoring, seawater desalination, electromagnetic energy collection and the like. Therefore, the absorption performance of the material is improved, and factors influencing the light absorption characteristics of the material are excavated, so that the method has important significance in scientific research and technical application.
In recent years, researchers have implemented high light absorption efficiency by applying micro-nano structures, and particularly have implemented strong absorption by localized surface plasmon resonance of noble metal micro-nano structures. These noble metal micro-nano structures are also commonly referred to as metamaterials. Researchers have widely adopted metal-dielectric-metal based micro-structural arrays, such as cylindrical arrays, disk arrays, circular hole arrays, cross arrays, etc., to achieve surface plasmon resonance for strong absorption. For example, the invention patent CN110196464A discloses a composite microstructure combining a metal-dielectric periodic film stack and a metal microstructure array, which realizes broadband light absorption in visible light and near infrared bands; the invention patent CN106711271A discloses a three-band near-infrared absorber based on a semiconductor super-surface structure, which is composed of a substrate, a metal film layer and a semiconductor super-surface from bottom to top in sequence, and realizes strong absorption of a near-infrared waveguide.
In the prior art, the strong absorption of light is mostly realized by an independent noble metal structure or a semiconductor structure, and the requirement on preparation is high; after the light absorption micro-nano structure is prepared, the light absorption characteristic of the micro-nano structure cannot be adjusted, and the application is inconvenient.
Disclosure of Invention
In order to solve the problems, the invention provides a magnetic field regulation and control type light absorption device which comprises a substrate and light absorption units arranged on the substrate periodically, wherein each light absorption unit comprises a precious metal film and a magnetic material part, the precious metal films of adjacent light absorption units are communicated, round holes and rectangular holes are formed in the precious metal films, the rectangular holes are formed in one sides of the round holes, the rectangular parts are not communicated with the round holes, and the magnetic material parts are arranged in the round holes.
Further, the light absorption units are arranged with a square period.
Further, the distance between the rectangular hole and the circular hole is less than 100 nanometers.
Further, the distance between the rectangular hole and the circular hole is less than 40 nanometers.
Further, the material of the noble metal thin film is gold or silver.
Further, the material of the magnetic material portion is bismuth iron garnet.
Further, the midpoint of the long side of the rectangular hole is closest to the distance of the circular hole.
Further, the magnetic material portion fills the circular hole.
Still further, the noble metal film has a thickness of less than 200 nm.
Still further, the noble metal film has a thickness of less than 80 nanometers.
The invention has the beneficial effects that: the invention provides a magnetic field regulation and control type light absorption device which comprises a substrate and light absorption units arranged on the substrate periodically, wherein each light absorption unit comprises a precious metal film and a magnetic material part, the precious metal films of adjacent light absorption units are communicated, round holes and rectangular holes are formed in the precious metal films, the rectangular holes are formed in one sides of the round holes and are not communicated with the round holes, and the magnetic material parts are arranged in the round holes. When the light absorption device is applied, incident light is circularly polarized light, the incident light vertically or obliquely irradiates the light absorption device, and a surrounding charge circulation is generated near the circular hole under the excitation of the incident light. Under the action of an external magnetic field, the refractive index of the magnetic material part changes, and the dielectric environment near the circular hole is changed, so that the local surface plasmon resonance near the circular hole is changed, namely the magnetic field regulates and controls the local surface plasmon resonance, and particularly the wavelength of the local surface plasmon resonance is changed. The invention realizes the regulation and control of the light absorption characteristic of the micro-nano structure, is convenient to absorb the incident light with different wavelengths, and widens the application range of the device. In the invention, the rectangular hole limits the charge circulation near the round hole, namely the charge circulation is gathered in a narrower area, and the current density is increased, so that the device realizes stronger light absorption.
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 top view of a magnetic field modulation type light absorption device.
FIG. 2 is a schematic cross-sectional view of a magnetic field control type light absorption device.
Fig. 3 is a schematic diagram of a top view of another magnetic field modulation type light absorption device.
Fig. 4 is a schematic top view of yet another magnetic field control type light absorption device.
FIG. 5 is a schematic cross-sectional view of another magnetic field control type light absorption device.
In the figure: 1. a substrate; 2. a circular hole; 3. a magnetic material portion; 4. a rectangular hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The invention provides a magnetic field regulation and control type light absorption device which comprises a substrate and light absorption units which are arranged on the substrate 1 in a periodic mode. The material of the substrate is silicon dioxide. The light absorption units are arranged in a square period. In practical application, when the light absorption units are arranged in a rectangular period, the core concept of the invention can still be realized. Fig. 1 is a top view of a light absorbing unit. Fig. 2 is a cross-sectional view of a light-absorbing unit, which does not comprise rectangular holes 4, but only circular holes 2. As shown in fig. 1, the light absorption unit includes a noble metal thin film and a magnetic material portion 3. The material of the noble metal film is gold or silver. The refractive index of the magnetic material portion 3 changes by the action of the applied magnetic field. Preferably, the material of the magnetic material portion 3 is bismuth iron garnet or yttrium iron garnet. The dielectric loss of the bismuth iron garnet or the yttrium iron garnet is low, so that no light is absorbed in the absorption device, the regulation and control amount of the device is single when the device is regulated and controlled, the relationship between the absorption and an external magnetic field is favorably established, and the result analysis is convenient. The noble metal films of the adjacent light absorption units are communicated, the noble metal films of the adjacent light absorption units form the whole noble metal film, and the noble metal film is arranged on the substrate 1. The noble metal film is provided with a round hole 2 and a rectangular hole 3. The diameter of the round hole 2 is larger than 60 nanometers and smaller than 200 nanometers, the long side of the rectangular hole 3 is larger than the diameter of the round hole 2, and the short side of the rectangular hole 3 is larger than 20 nanometers. The rectangular hole 4 is not communicated with the round hole 2, and a noble metal material is arranged between the rectangular hole 4 and the round hole 2. The length of the long side of the rectangular hole 4 is set to be larger than the diameter of the circular hole 2 so as to limit the currents around the circular hole 2, and these currents are limited to the minimum area between the rectangular hole 4 and the circular hole 2 where a high current density is formed, thereby forming high-intensity light absorption. A rectangular hole 4 is provided at one side of the circular hole 2. The magnetic material part 3 is arranged in the round hole, and when the refractive index of the magnetic material part 3 is changed, the charge circulation near the round hole 2 is changed, so that the light absorption is regulated.
When the light absorbing device is applied, incident light is circularly polarized light, the incident light vertically or obliquely irradiates the light absorbing device, and a surrounding charge circulation is generated near the circular hole 2 under the excitation of the incident light. Under the action of an external magnetic field, the refractive index of the magnetic material part 3 changes, and the dielectric environment near the circular hole 2 is changed, so that the local surface plasmon resonance near the circular hole 2 is changed, namely the magnetic field regulates and controls the local surface plasmon resonance, and particularly the wavelength of the local surface plasmon resonance is changed. The invention realizes the regulation and control of the light absorption characteristic of the micro-nano structure, is convenient to absorb the incident light with different wavelengths, and widens the application range of the device. In the invention, the rectangular hole 4 limits the charge circulation near the round hole 2, namely the charge circulation is gathered in a narrower area, and the current density is increased, so that the device realizes stronger light absorption. In the invention, the direction of the external magnetic field is set to be parallel to the substrate 1, and the circulating current generated by the electric charges, namely the magnetic dipole moment of the magnetic dipole resonance is vertical to the substrate 1, so that the direction of the external magnetic field is vertical to the direction of the magnetic dipole moment, the change of the external magnetic field has larger influence on the direction of the magnetic dipole moment, the surface plasmon resonance of the magnetic dipole is changed more, and the regulation sensitivity is higher. In the invention, the generated charge circulation, namely magnetic dipole resonance, surrounds the circular hole 2, and the magnetic material part 3 is arranged in the circular hole 2, so when an external magnetic field acts on the magnetic material part 3, the resonance of the magnetic dipole is greatly influenced by the change of the magnetic material, the surface plasmon resonance of the magnetic dipole is changed more, and the regulation sensitivity is higher. In the present invention, the regions between the rectangular holes 4 and the circular holes 2 absorb light and generate heat, but these regions are communicated with the entire noble metal thin film, so that heat is transferred to the entire noble metal thin film, and the heat utilization efficiency is improved.
Alternatively, the device may be used as a magneto-optical sensing device. When incident light is excited on the magnetic material portion 3, a magneto-optical effect is achieved. The magneto-optical effect refers to various optical phenomena caused by interaction between a substance in a magnetized state and light. When a beam of linearly polarized light passes through the magneto-optical material in a magnetic field, the polarization direction of the light is changed, so that the absorption intensity and wavelength of the device can be detected. And, the size of magnetic material portion 3 is the same with the size of round hole 2, so the magnetic resonance on the magnetic material portion is close with the electromagnetic resonance wavelength on the magnetic resonance around round hole 2, so two resonance couplings can have the effect of mutual enhancement to make surface plasmon resonance can realize the magneto-optical effect reinforcing effect in magnetic material portion 3.
Example 2
On the basis of example 1, the distance between the rectangular hole 4 and the circular hole 2 is less than 100 nanometers. Further, the distance between the rectangular hole 4 and the circular hole 2 is less than 40 nm. Further, the distance between the rectangular hole 4 and the circular hole 2 is less than 20 nm. When the charges flow between the rectangular hole 4 and the circular hole 2, the charges need to pass through the narrow area, the current density of the narrow area is high, the generated heat is large, and the photothermal conversion efficiency is improved.
Example 3
In addition to example 2, as shown in fig. 3, fig. 3 is a plan view of a light absorption unit, in which a magnetic material portion 3 is in contact with a side surface of a circular hole 2, and the magnetic material portion 3 fills the circular hole 2. The electric charge circulation near the circular hole 2 is closer to the magnetic material portion 3, and the magnetic material portion 3 has a stronger restraining effect on the electric charge circulation from the inside of the circular hole 2. When the external magnetic field is changed, the magnetic material part 3 changes more the charge circulation, so that the local surface plasmon resonance near the circular hole 2 is changed more, and the light absorption regulation with higher sensitivity is realized.
Example 4
In example 3, the midpoint of the long side of the rectangular hole 4 is closest to the circular hole 2, as shown in fig. 3, that is, the rectangular hole 4 is symmetrically disposed on one side of the circular hole 2. Therefore, the invention can generate the same absorption for circularly polarized light with different polarization states, namely, the same absorption for left-handed circularly polarized light and right-handed circularly polarized light.
Furthermore, the rectangular holes 4 are asymmetrically arranged on one side of the circular hole 2, so that different absorption is generated on the left-handed circularly polarized light and the right-handed circularly polarized light, and detection of circularly polarized light in different polarization states is realized. Specifically, the different convergence effects of the rectangular hole 4 on the charge circulation currents with different rotation directions cause different absorption of different circularly polarized light in the narrow areas of the rectangular hole 4 and the circular hole 2, so that the detection of circularly polarized light with different polarization states is realized.
Example 5
On the basis of example 4, the thickness of the noble metal film is less than 200 nm. Still further, the noble metal film has a thickness of less than 80 nanometers. Further, the noble metal thin film has a thickness of less than 40 nm. In this way, the charge circulating current around the circular hole 2 is concentrated in a smaller area or cross section, enhancing the current density, making the present invention more absorptive of light.
Example 6
In example 5, as shown in fig. 4, the rectangular hole 4 is filled with the magnetic material portion 3. Because the distance between the rectangular hole 4 and the circular hole 2 is less than 40 nanometers, after the rectangular hole 4 is filled with the magnetic material, the magnetic material changes the charge circulation between the rectangular hole 4 and the circular hole 2 under the action of a magnetic field, so that the absorption of the whole device to light is changed, and the magnetic field regulation and control type light absorption with higher sensitivity is realized.
Example 7
On the basis of example 6, as shown in fig. 5, the magnetic material in the magnetic material portion 3 covers the edge of the circular hole 2, particularly the noble metal thin film between the rectangular hole 4 and the circular hole 2. On one hand, under the action of a magnetic field, the charge circulation changes more, particularly the resonance wavelength of the charge circulation, namely the local surface plasmon resonance wavelength, so that magnetic field regulation type light absorption with higher sensitivity is realized; on the other hand, the magnetic material covers the noble metal film, particularly the noble metal film which generates heat, so that the heat radiation is reduced, more heat is concentrated on the surface of the metal film, and more heat is generated conveniently.
In conclusion, in the invention, the refractive index of the magnetic material is changed under the action of the magnetic field, and the charge circulation near the round hole 2 is regulated and controlled, so that the light absorption is regulated and controlled. The magnetic field is used for regulation and control, and the regulation and control are convenient, and the popularization and the application are convenient.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a magnetic field regulation and control type light absorption device, its characterized in that includes the substrate and arranges in the light absorption unit of cycle arrangement on the substrate, the light absorption unit includes noble metal film and magnetic material portion, and is adjacent the noble metal film UNICOM of light absorption unit, be equipped with round hole and rectangular hole in the noble metal film, the rectangular hole sets up one side of round hole, the rectangular hole with the round hole UNICOM, magnetic material portion sets up in the round hole.
2. The magnetic field modulation light absorbing device according to claim 1, wherein: the arrangement period of the light absorption units is a square period.
3. The magnetic field modulation light absorbing device according to claim 1, wherein: the distance between the rectangular hole and the round hole is less than 100 nanometers.
4. A magnetic field regulation type light absorption device according to claim 3, wherein: the distance between the rectangular hole and the round hole is less than 40 nanometers.
5. The magnetic field modulation light absorbing device according to claim 1, wherein: the material of the noble metal film is gold or silver.
6. A magnetic field modulation type light absorption device according to claim 1, wherein: the magnetic material part is made of bismuth iron garnet.
7. The magnetic field modulation light absorbing device according to claim 1, wherein: the distance between the middle point of the long side of the rectangular hole and the round hole is the nearest.
8. The magnetic field modulation light-absorbing device according to any one of claims 1 to 7, wherein: the magnetic material portion fills the circular hole.
9. The magnetic field modulation light absorbing device according to claim 8, wherein: the thickness of the noble metal film is less than 200 nanometers.
10. The magnetic field modulation light absorbing device according to claim 9, wherein: the thickness of the noble metal film is less than 80 nanometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119852.7A CN114442343A (en) | 2022-02-09 | 2022-02-09 | Magnetic field regulation and control type light absorption device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119852.7A CN114442343A (en) | 2022-02-09 | 2022-02-09 | Magnetic field regulation and control type light absorption device |
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| CN114442343A true CN114442343A (en) | 2022-05-06 |
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| CN202210119852.7A Withdrawn CN114442343A (en) | 2022-02-09 | 2022-02-09 | Magnetic field regulation and control type light absorption device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966922A (en) * | 2022-05-18 | 2022-08-30 | 大连大学 | Plasmon amplitude tuner based on rhodium-silicon dioxide nano composite structure |
-
2022
- 2022-02-09 CN CN202210119852.7A patent/CN114442343A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966922A (en) * | 2022-05-18 | 2022-08-30 | 大连大学 | Plasmon amplitude tuner based on rhodium-silicon dioxide nano composite structure |
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Application publication date: 20220506 |