CN111240056B - Acousto-optic modulator - Google Patents
Acousto-optic modulator Download PDFInfo
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- CN111240056B CN111240056B CN202010069815.0A CN202010069815A CN111240056B CN 111240056 B CN111240056 B CN 111240056B CN 202010069815 A CN202010069815 A CN 202010069815A CN 111240056 B CN111240056 B CN 111240056B
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- dimensional material
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- lubricating layer
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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
- G02F1/11—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 acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
Abstract
The invention discloses an acousto-optic modulator which comprises a base, wherein a vertical cylindrical lubricating layer is fixedly arranged on the base, the lubricating layer is hollow, the base covers an opening at the bottom end of the lubricating layer, a two-dimensional material is arranged on the upper surface of the lubricating layer, the two-dimensional material covers an opening at the top end of the lubricating layer, and the base, the lubricating layer and the two-dimensional material form a closed gas cavity. The beneficial effects of the invention are: when the sound wave is transmitted to the structure, the sound pressure enables the two-dimensional material to slide on the lubricating layer and changes the distance between the two-dimensional material and the conductive base, so that sound and light regulation and control are achieved.
Description
Technical Field
The invention relates to the technical field of acoustooptic, in particular to an acoustooptic modulator.
Background
The acousto-optic modulator has low driving power and excellent temperature stability. However, the traditional acousto-optic modulator is low in modulation speed and is mainly applied to the fields of printers, laser engraving and the like which have low requirements on modulation speed. The traditional acousto-optic modulator can only respond well to sound waves and light in a specific frequency range, and has a narrow application range, and the main reason is that the traditional acousto-optic modulation mainly utilizes the resonance of the sound waves and the diffraction of the light, so that the conditions of resonance, diffraction and interference are required to be met, and the acousto-optic modulation can only occur under the specific frequency.
Disclosure of Invention
The invention aims to solve the technical problem of providing an acousto-optic modulator, when sound waves are transmitted to the structure, sound pressure enables a two-dimensional material to slide on a lubricating layer and changes the distance between the two-dimensional material and a conductive base so as to realize acousto-optic regulation, the acousto-optic modulator is wide in working frequency band, can convert sound wave signals of infrasonic waves to ultrasonic waves with the frequency of 10GHz into optical signals in the range from ultraviolet to infrared spectrums, and is high in response speed.
The technical scheme for solving the technical problems is as follows: the base is fixedly provided with a cylindrical lubricating layer, the lubricating layer is hollow, the base covers the bottom opening of the lubricating layer, the upper surface of the lubricating layer is provided with a two-dimensional material, the two-dimensional material covers the top opening of the lubricating layer, and the base, the lubricating layer and the two-dimensional material form a closed gas chamber.
The invention has the beneficial effects that: when the sound wave is transmitted to the structure, the sound pressure enables the two-dimensional material to slide on the lubricating layer and changes the distance between the two-dimensional material and the conductive base, so that sound and light regulation is realized; the acousto-optic modulator is extremely small in thickness, has good correspondence to ultra-high frequency sound waves with extremely small wavelength, does not depend on resonance of a film to the sound waves, and not only corresponds to specific frequency, so that the acousto-optic modulator is wide in working frequency band, can convert sound wave signals of ultrasonic waves with infrasonic wave frequency of 10GHz into optical signals in the range from ultraviolet to infrared spectrums, and is high in response speed.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the two-dimensional material is single-layer or multi-layer graphene.
The beneficial effects of adopting the further scheme are that the mass density of the graphene per unit area is low, the acceleration and the movement speed of the graphene are high under the action of sound pressure, and the modulation speed is high; the graphene has good air tightness, stable internal air pressure and good working stability; graphene is high in strength and not prone to cracking under strong sound pressure, and in addition, the graphene is small in change of absorption rate from ultraviolet to infrared bands, and the working band is wide. The graphene is very thin, is uniformly absorbed and has small influence on the wavefront of a light beam.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, a plurality of radiation strips are fixedly arranged on the outer wall of the lubricating layer in the circumferential direction.
The technical scheme has the advantages that the support is provided for the two-dimensional material, and the restoring force is provided by Van der Waals force between the radiation strips and the two-dimensional material, so that the restoring speed of the two-dimensional material can be changed by changing the width and the number of the radiation strips, and the modulation efficiency or the modulation speed is improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the material of the lubricating layer is graphite.
The beneficial effect of adopting the further scheme is that the super-lubricating effect exists between graphite, particularly graphite crystal dissociation surface and graphene, the friction coefficient is extremely small, and the modulation speed is favorably improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the base is made of aluminum with a smooth surface.
The beneficial effect of adopting above-mentioned further scheme is that the aluminium material all has higher reflectivity in ultraviolet to infrared band, is favorable to improving the light interference between base and the two-dimensional material, improves modulation efficiency and work bandwidth.
On the basis of the scheme, the invention can be further improved as follows.
Further, the gas filled in the gas chamber is nitrogen.
The beneficial effects of adopting above-mentioned further scheme are that nitrogen gas stability is good, is difficult for taking place chemical reaction with two-dimensional material, lubricating layer and base, and the gas tightness is good.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a lubricating layer;
in the drawings, the components represented by the respective reference numerals are listed below:
1. smooth aluminum base 2, lubricating layer 3, two-dimensional material 4, modulated light 5, modulated sound wave.
Detailed Description
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the box or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection can be mechanical connection or circuit connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
as shown in fig. 1, in this embodiment, an acousto-optic modulator includes a base 1, a lubricating layer 2 that is a vertical cylinder is fixedly arranged on the base 1, the lubricating layer 2 is hollow, the base 1 covers the bottom opening of the lubricating layer 2, the upper surface of the lubricating layer 2 is provided with a two-dimensional material 3, the two-dimensional material 3 covers the top opening of the lubricating layer 2, the base 1, the lubricating layer 2 and the two-dimensional material 3 form a sealed gas chamber, gas filled in the gas chamber is nitrogen, the nitrogen has good stability, and is not easy to react with the two-dimensional material 3, the lubricating layer 2 and the base 1, and the air tightness is good.
The lubricating layer 2 is a cylindrical and hollow structure, a plurality of radiation strips are fixedly arranged on the outer wall of the lubricating layer 2 in the circumferential direction, the height of the radiation strips is 500 nanometers, the outer diameter of the radiation strips is 20 micrometers, the inner diameter of the radiation strips is 19 micrometers, the length of the radiation strips is 2 micrometers, the width of the radiation strips is 50 nanometers, the number of the radiation strips is 8, the single-layer graphene is circular, the diameter of the single-layer graphene is 20.02 micrometers, and the single-layer graphene covers the lubricating layer. For a frequency of 10GHz, the energy is 1mW/cm 2 The modulation response time of the ultrasonic wave can reach 0.1 microsecond, and if the frequency or the sound pressure of the sound wave is further increased, the response time can be further improved. The annular gas tightness is good, and inside atmospheric pressure is stable, and device job stabilization nature is good, and the loop configuration can provide stronger restoring force, avoids two-dimensional material 3 and loop configuration to break away from, avoids two-dimensional material 3 and base 1's direct contact, better support two-dimensional material 3. The outer divergent radiating strips provide support for the two-dimensional material 3, and the restoring speed of the two-dimensional material 3 can be changed by changing the width and the number of the radiating strips due to the restoring force provided by the van der waals force between the radiating strips and the two-dimensional material 3, so that the modulation efficiency is improved or the modulation speed is improved.
The lubricating layer 2 is made of graphite; the two-dimensional material 3 is single-layer or multi-layer graphene. And a super-lubrication effect exists between the graphite and the graphene, the friction coefficient is extremely small, and the modulation speed is favorably improved and the power consumption is reduced.
Due to the action of sound pressure, certain air pressure difference exists between the inner air pressure and the outer air pressure, and under the action of the pressure, the graphene slides on the lubricating layer and moves downwards or upwards relative to the smooth base, so that the light absorption of the base and the graphene and the reflectivity of a system are changed.
The material of the lower part of the lubricating layer 2 can also be replaced by other airtight materials, the movement of the two-dimensional material 3 on the lubricating layer 2 is not influenced, the cost can be reduced, and the air tightness and the structural mechanical strength can be increased.
The incident angles of the modulated light 4 and the modulated sound wave 5 are preferably adjusted, and when the modulated light 4 is incident obliquely at 60 degrees, the modulated sound wave 5 is incident perpendicularly. When the light enters obliquely, the light absorption adjustable range of the graphene is larger, and the reflection change is larger.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An acousto-optic modulator characterized by: including base (1), fixed being equipped with on base (1) and being vertical tube-shape lubricant film (2), lubricant film (2) are cavity, base (1) closing cap the bottom opening of lubricant film (2), the upper surface of lubricant film (2) is equipped with two-dimensional material (3), two-dimensional material (3) closing cap the top end opening of lubricant film (2), base (1), lubricant film (2) with two-dimensional material (3) form inclosed gas cavity, because the effect of acoustic pressure, there is a certain atmospheric pressure difference in inside and outside atmospheric pressure, under this pressure effect two-dimensional material (3) will be in lubricant film (2) slide, for base (1) moves down or upward, thereby changes base (1) with the light absorption of two-dimensional material (2) and the reflectivity of system.
2. An acousto-optic modulator according to claim 1, characterised in that: the two-dimensional material (3) is single-layer or multi-layer graphene.
3. The acousto-optic modulator according to claim 2, wherein: a plurality of radiation strips are fixedly arranged on the outer wall of the lubricating layer (2) in the circumferential direction and used for supporting the two-dimensional material (3).
4. An acousto-optic modulator according to claim 3, characterised in that: the lubricating layer (2) is made of graphite.
5. An acousto-optic modulator according to any one of claims 1-4 characterised in that: the base (1) is made of aluminum with a smooth surface.
6. An acousto-optic modulator according to any one of claims 1-4 characterised in that: the gas filled in the gas chamber is nitrogen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010069815.0A CN111240056B (en) | 2020-01-21 | 2020-01-21 | Acousto-optic modulator |
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| CN202010069815.0A CN111240056B (en) | 2020-01-21 | 2020-01-21 | Acousto-optic modulator |
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| CN111240056B true CN111240056B (en) | 2023-01-24 |
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| JP2017011209A (en) * | 2015-06-25 | 2017-01-12 | 株式会社東芝 | Graphene light receiving element and graphene light modulator |
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