CN114280804B - Super-surface-based light field regulation and control method and light field regulator - Google Patents
Super-surface-based light field regulation and control method and light field regulator Download PDFInfo
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- CN114280804B CN114280804B CN202111671841.1A CN202111671841A CN114280804B CN 114280804 B CN114280804 B CN 114280804B CN 202111671841 A CN202111671841 A CN 202111671841A CN 114280804 B CN114280804 B CN 114280804B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 description 12
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The invention discloses a light field regulation and control method and a light field regulator based on a super surface, and relates to the field of light field regulation and control, wherein the method comprises the following steps: inputting the carrier wave added with the signals to a demultiplexer based on a super-surface structure for splitting; the carrier wave after beam splitting is incident on an active area photosurface of the LCOS spatial light modulator; and adjusting the gray level of the silicon-based liquid crystal spatial light modulator, and adjusting the angle of the split carrier wave to realize the light field regulation of a preset coverage area. The invention can realize the effective regulation and control of the light field in a large coverage area.
Description
Technical Field
The invention relates to the field of light field regulation, in particular to a light field regulation method and a light field regulator based on a super surface.
Background
With the rapid increase in the number of wireless terminal devices and the continuous emergence of new multimedia, the demand for information transmission capacity increases exponentially, and wireless spectrum resources are increasingly in shortage.
Currently, optical wireless communication attracts enough attention in academia and industry because it can provide a rich spectrum and can relieve the pressure of wireless spectrum. Furthermore, wireless communication of the optical frequency band may be resistant to electromagnetic interference. In optical wireless communication, effective regulation of an optical field is one of the most important technologies. However, there is currently a lack of means to achieve effective modulation of the light field over a large coverage area.
Disclosure of Invention
In view of the defects in the prior art, the first aspect of the invention provides a super-surface-based light field regulation and control method, which can realize effective regulation and control of a light field in a large coverage area.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a light field regulation and control method based on a super surface comprises the following steps:
inputting the carrier wave added with the signals to a demultiplexer based on a super-surface structure for splitting;
the carrier wave after beam splitting is incident on an active area photosurface of the LCOS spatial light modulator;
and adjusting the gray level of the silicon-based liquid crystal spatial light modulator, and adjusting the angle of the split carrier wave to realize the light field regulation of a preset coverage area.
In some embodiments, the inputting the carrier wave of the added signal to the demultiplexer based on the super surface structure for splitting includes:
the light wave emitted by the laser is used as a carrier wave to carry out signal adding;
inputting the carrier wave added with the signals into a collimator for collimation;
and vertically incidence of the collimated carrier wave to a demultiplexer based on a super-surface structure for beam splitting.
In some embodiments, the beam waist of the carrier wave output by the collimator just covers the super-surface structure.
In some embodiments, the metasurface structure is configured as a reflective type or a projective type using geometric phase, transmission phase, or a combination of geometric and transmission phases.
In some embodiments, a splitter with a divergence angle of 40 ° is used, and the carrier to which the signal is added may be split into four rows and four columns.
In some embodiments, the pixel cell size of the active area of the LCOS spatial light modulator is 8 μm and is responsive to 1550nm wavelength.
In some embodiments, the gray scale of the LCOS spatial light modulator is adjusted such that the angle of adjustment of the split carrier is 10.
The second aspect of the present invention provides a super-surface based light field modulator that can achieve efficient modulation of the light field over a large coverage area.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a subsurface-based light field modulator, comprising:
a demultiplexer based on a super-surface structure, which is used for splitting the input carrier wave added with the signals;
the silicon-based liquid crystal spatial light modulator is used for receiving the carrier wave split by the splitter, and adjusting the angle of the split carrier wave by adjusting the gray level so as to realize the light field regulation of a preset coverage area.
In some embodiments, the divergence angle of the splitter is 40 ° and the carrier to which the signal is added may be divided into four rows and four columns.
In some embodiments, the pixel cell size of the active region of the LCOS spatial light modulator is 8 μm and is responsive to a 1550nm wavelength.
In some embodiments, the metasurface structure is configured as a reflective type or a projective type using geometric phase, transmission phase, or a combination of geometric and transmission phases.
In some embodiments, the light field modulator further comprises a collimator for collimating the signal-added carrier.
In some embodiments, the beam waist of the carrier wave output by the collimator just covers the super-surface structure.
Compared with the prior art, the invention has the advantages that:
according to the super-surface-based light field regulation and control method, firstly, a carrier wave added with signals is input to a wave splitter based on a super-surface structure for splitting, then the split carrier wave is incident on an active area light sensing surface of a silicon-based liquid crystal spatial light modulator, and then the angle of the split carrier wave is regulated by regulating the gray level of the silicon-based liquid crystal spatial light modulator, so that the light field regulation and control of a preset coverage area can be realized, and the effective regulation and control of the light field in a large coverage area can be well realized.
Drawings
FIG. 1 is a flow chart of a method for subsurface-based light field modulation in an embodiment of the invention;
FIG. 2 is a flowchart of step S1 in FIG. 1;
FIG. 3 is a schematic diagram of a super-surface based light field modulator in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Referring to fig. 1, an embodiment of the present invention provides a light field adjusting method based on a super surface, which includes the following steps:
s1, inputting a carrier wave added with signals to a demultiplexer based on a super-surface structure for splitting.
Specifically, in some embodiments, referring to fig. 2, step S1 includes:
s11, adding signals by taking light waves emitted by a laser as carrier waves;
s12, inputting the carrier wave added with the signals into a collimator for collimation;
s13, vertically incidence of the collimated carrier wave on a beam splitter based on a super-surface structure for beam splitting.
It can be understood that the light wave emitted by the laser is taken as a carrier wave, and is input into the collimator for emission after the signal is added, wherein parameters of the collimator need to be selected according to the size of a super-surface structure (super-surface chip), and the beam waist of the output light needs to be capable of covering the super-surface chip.
The light beam passing through the collimator can be regarded as a parallel light beam, vertically enters the super-surface chip, and can uniformly or uniformly split the light wave through the designed super-surface. The super-surface structure is set to be a reflective type or a projection type by using a geometric phase, a transmission phase, or a combination of geometric phases and transmission phases.
S2, the split carrier waves are incident on the light sensitive surface of the active area of the silicon-based liquid crystal spatial light modulator.
S3, adjusting the gray level of the silicon-based liquid crystal spatial light modulator, and adjusting the angle of the split carrier wave to realize light field regulation of a preset coverage area.
In some embodiments, a beam splitter with a divergence angle of 40 ° 4*4 is used, and then a 4*4 spot reflected by the super surface is incident on the active area photosurface of the liquid crystal-in-silicon spatial light modulator. Taking 1550nm wavelength response LCOS spatial light modulator as an example, the size of the pixel unit of the active region is 8 μm, and the regulation angle of the gray scale to the light field is 10 degrees.
The following is a specific example:
the light field regulating device formed by the wave splitter based on the super surface structure and the silicon-based liquid crystal spatial light modulator is placed on the ceiling of a room, and the height between the ceiling and the ground is 3m. The spatial cross-section of the light field regulation is shown in fig. 3, and the light field regulation is distributed as areas 1, 2, 3 and 4 on a row of the ground, and each area corresponds to one optical wireless user terminal.
By adjusting α=20°, β=10°, it is found by calculation that l2=h/cos β=3.04 m, l1=h/cos (α+β) =3.46 m, r2≡l2×sin 10+=0.52 m, r1≡l1×sin 10+=0.60 m, l=w+.4× (r1+r2) =4.48 m.
Thus, the light field regulator based on the large coverage area of the super surface can realize 4.48 multiplied by 4.48m 2 Light field modulation of coverage.
In summary, according to the super-surface-based optical field regulation and control method disclosed by the invention, a carrier wave added with a signal is firstly input to a wave splitter based on a super-surface structure for splitting, then the split carrier wave is incident on an active area photosurface of a silicon-based liquid crystal spatial light modulator, and then the angle of the split carrier wave is regulated by regulating the gray level of the silicon-based liquid crystal spatial light modulator, so that the optical field regulation and control of a preset coverage area can be realized, and the effective regulation and control of the optical field in a large coverage area can be well realized.
Referring to FIG. 3, an embodiment of the present invention provides a super-surface based optical field modulator including a super-surface structure based demultiplexer (Metaselpha) and a liquid crystal on silicon spatial light modulator (LCOS).
The splitter is used for splitting the input carrier wave added with the signals; the silicon-based liquid crystal spatial light modulator is used for receiving the carrier wave split by the splitter, and adjusting the angle of the split carrier wave by adjusting the gray level so as to realize the light field regulation of a preset coverage area.
That is, the super-surface based light field modulator in the embodiment of the present invention is composed of two parts: a demultiplexer based on a super surface structure and a liquid crystal on silicon spatial light modulator. The super-surface structure wave splitter can realize the wave splitting of the incident light wave, and is characterized in that any angle and any wave splitting number of the light field can be realized on a compact chip. The silicon-based liquid crystal spatial light modulator has the function of realizing the regulation and control of the angle of incident light waves.
In some embodiments, the divergence angle of the splitter is 40 ° and the carrier to which the signal is added may be divided into four rows and four columns.
In some embodiments, the pixel cell size of the active region of the LCOS spatial light modulator is 8 μm and is responsive to a 1550nm wavelength.
In some embodiments, the metasurface structure is configured as a reflective type or a projective type using geometric phase, transmission phase, or a combination of geometric and transmission phases.
In some embodiments, the light field modulator further comprises a collimator (Transmitter collimator) for collimating the signal-added carrier.
In some embodiments, the beam waist of the carrier wave output by the collimator just covers the super-surface structure.
In summary, according to the super-surface-based optical field modulator disclosed by the invention, the carrier added with the signals is split through the wave splitter based on the super-surface structure, the split carrier is incident on the light-sensitive surface of the active area of the LCOS spatial light modulator, and the angle of the split carrier is adjusted by adjusting the gray level of the LCOS spatial light modulator, so that the optical field modulation of a preset coverage area can be realized, and the effective modulation of the optical field in a large coverage area is well realized.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments. While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A super-surface-based light field regulation and control method is characterized by comprising the following steps:
inputting the carrier wave added with the signals to a demultiplexer based on a super-surface structure for splitting;
the carrier wave after beam splitting is incident on the light sensitive surface of the active area of the LCOS spatial light modulator, wherein the size of a pixel unit of the active area of the LCOS spatial light modulator is 8 mu m and is responded by 1550nm wavelength;
the gray scale of the silicon-based liquid crystal spatial light modulator is adjusted, and angle adjustment is carried out on the split carrier wave so as to realize light field regulation and control of a preset coverage area;
the method for splitting the carrier wave added with the signals by inputting the carrier wave added with the signals to a demultiplexer based on a super-surface structure comprises the following steps:
the light wave emitted by the laser is used as a carrier wave to carry out signal adding;
inputting the carrier wave added with the signals into a collimator for collimation;
vertically incidence of the collimated carrier wave to a beam splitter based on a super-surface structure for beam splitting;
the divergence angle is 40 degrees, and the carrier wave added with the signals can be split into four rows and four columns of wave splitters for beam splitting.
2. The super-surface based light field regulation method of claim 1, wherein: the beam waist of the carrier wave output by the collimator just covers the super-surface structure.
3. The super-surface based light field regulation method of claim 1, wherein: the super-surface structure is set to be of a reflective type or a projection type by means of a geometric phase, a transmission phase, or a combination of geometric phases and transmission phases.
4. The super-surface based light field regulation method of claim 1, wherein: the gray scale of the liquid crystal on silicon spatial light modulator is adjusted so that the angle of adjustment of the split carrier is 10 °.
5. A super-surface based light field modulator implementing the super-surface based light field modulation method of any one of claims 1 to 4, comprising:
the super-surface structure-based wave separator is used for splitting an input carrier wave added with signals, the divergence angle of the wave separator is 40 degrees, and the carrier wave added with the signals can be divided into four rows and four columns;
the silicon-based liquid crystal spatial light modulator is used for receiving the carrier wave split by the splitter, and adjusting the angle of the split carrier wave by adjusting the gray level so as to realize the light field regulation of a preset coverage area, wherein the size of a pixel unit of an active area of the silicon-based liquid crystal spatial light modulator is 8 mu m and is responded by 1550nm wavelength;
the collimator is used for inputting the carrier wave added with the signals into the collimator for collimation, and vertically incidence the collimated carrier wave on the demultiplexer based on the super-surface structure, wherein the carrier wave is the light wave emitted by the laser.
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