CN106527093B - Hologram image multiplexing method and system based on frequency doubling non-linear and polarization characteristic - Google Patents
Hologram image multiplexing method and system based on frequency doubling non-linear and polarization characteristic Download PDFInfo
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
- G03H1/2645—Multiplexing processes, e.g. aperture, shift, or wavefront multiplexing
- G03H2001/267—Polarisation multiplexing
Abstract
The present invention provides a kind of hologram image multiplexing method and system.The method includes S1, are based on micro-nano structure, obtain the phase information for reappearing each pixel of every width hologram image when different hologram images on a different frequency；S2 is based on the phase information, carries out corresponding phase coding modulation to the Spatial transmission unit of the micro-nano structure；S3 obtains the reproduction image of different hologram images with the micro-nano structure after the incident light beam strikes coding of different polarization states.The difference for the Spatial transmission that the present invention is formed by polarity corresponding relationship under the SHG properties with the super surfacing of micro-nano structure, and different frequencys multiplication carries out phase coding modulation to the Spatial transmission unit of micro-nano structure, and obtains the reproduction of several hologram images；The influence of the ambient noise of reproduction result is eliminated by optical sieving.In addition, obtaining more image complex amplitude modulation holograms in conjunction with a complex amplitude modulation unit is formed come modulated pixels member by two Spatial transmission units.
Description
Technical field
The present invention relates to holographic technique field, more particularly, to a kind of complete based on frequency doubling non-linear and polarization characteristic
Cease image multiplexing method and system.
Background technique
It is the super surface constituted with micro-nano structure currently, calculating an important research direction in holographic technique
(metasurface) realize that hologram image is shown.It is this to calculate the holographic linear characteristic being achieved in that according to micro-nano structure,
Coding and sorting order mutually carried out and structure to the position of hologram by including nano-antenna, sub-wavelength magnitude split ring and other micro-nano structure
At super surface, to realize the Spatial transmission to incident light by the dipole array that is formed under incident light action.
Holographic display is carried out using the linear characteristic of micro-nano structure, can be encoded by the structure to micro-nano unit, shape
Holographic display is realized at the modulation of contraposition phase.But the holographic display of more images is realized by linear micro-nano structure, it is non-targeted
Image will form ambient noise when target image is reappeared, and influence the signal-to-noise ratio of image reproduction.
Current has researched and proposed a kind of method for realizing that more image holographies are shown using nonlinear material, with single micro-
Holographic dry plate of receiving can reappear three holograms out, but it reappears image quantity, and the modulation of a phase is only realized in research,
It cannot achieve the modulation of complex amplitude.
Summary of the invention
The present invention provide it is a kind of overcome the above problem or at least be partially solved the above problem based on frequency doubling non-linear
And the hologram image multiplexing method and device of polarization characteristic.
According to an aspect of the present invention, a kind of hologram image multiplexing method is provided, comprising:
S1 is based on micro-nano structure, obtains and reappears the every of every width hologram image when different hologram images on a different frequency
The phase information of a pixel；
S2 is based on the phase information, carries out corresponding phase coding tune to the Spatial transmission unit of the micro-nano structure
System；
S3 obtains the reproduction of different hologram images with the micro-nano structure after the incident light beam strikes coding of different polarization states
Image.
Further, the S1 further comprises:
S1.1 determines the incident light frequency of the micro-nano structure；
S1.2 calculates separately the emergent light of the micro-nano structure in the fundamental frequency and frequency multiplication of the incident light frequency at least one
The phase information of each pixel of width hologram image.
Specifically, the S2 further comprises:
As unit of the single Spatial transmission unit of the micro-nano structure, according to the phase information to the Spatial transmission
Unit carries out phase coding, realizes Spatial transmission；Or
As unit of the every two Spatial transmission unit of the micro-nano structure, institute's rheme is mutually adjusted according to the phase information
Unit processed carries out phase coding, realizes double Spatial transmissions.
Further, the S3 further comprises:
S3.1 is based on the incident light frequency, obtains rotatory polarization or line polarisation incident light；
S3.2 is based on the rotatory polarization, respectively with right-handed rotation and/or the incident micro-nano structure of left-handed rotation, obtains several
The reproduction image of hologram image；Or
Based on line polarisation, respectively with the direction x line polarisation and/or the incident micro-nano structure of the direction y line polarisation, several are obtained
The reproduction image of hologram image.
Specifically, the S1.2 further comprises:
When incident light is rotatory polarization right-handed rotation, 2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency,
And/or right hand component when two frequency multiplication of emergent light geometry texture θ and left-handed component 3 θ of geometry texture；And/or
When incident light is rotatory polarization left-handed rotation, -2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency,
And/or right hand component when two frequency multiplication of emergent light -3 θ of geometry texture and left-handed component geometry texture-θ；
Wherein, θ is the azimuth of the Spatial transmission unit of the micro-nano structure.
Specifically, the S1.2 further comprises:
When incident light is the direction x line polarisation, the geometry texture 2 of the direction y line polarisation when obtaining the emergent light fundamental frequency
The geometry texture θ of 3 direction the θ and x line polarisation of geometry texture of θ and/or the direction y line polarisation when two frequency multiplication of emergent light；
And/or
When incident light is the direction y line polarisation, the geometry texture -2 of the direction x line polarisation when obtaining the emergent light fundamental frequency
- 3 θ of geometry texture of the direction the geometry texture-θ and x line polarisation of θ and/or the direction y line polarisation when two frequency multiplication of emergent light；
Wherein, θ is the azimuth of the Spatial transmission unit of the micro-nano structure.
Specifically, double Spatial transmissions described in the S2 include:
When incident light is rotatory polarization right-handed rotation, 2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency1、
2θ2；And/or the geometry texture θ of right hand component when two frequency multiplication of emergent light1、θ2And 3 θ of geometry texture of left-handed component1、3
θ2；
Wherein, θ1And θ2It is divided into the azimuth of two Spatial transmission units of the complex amplitude modulation unit.
Specifically, double Spatial transmissions described in the S2 include:
When incident light is the direction x line polarisation, the geometry texture 2 of the direction y line polarisation when obtaining the emergent light fundamental frequency
θ1、2θ2And/or 3 θ of geometry texture of the direction y line polarisation when two frequency multiplication of emergent light1、3θ2And the direction x line polarisation is several
He Weixiang θ1、θ2；
Wherein, θ1And θ2It is divided into the azimuth of two Spatial transmission units of the complex amplitude modulation unit.
According to another aspect of the present invention, a kind of hologram image multiplexer is also provided, described device includes successively going here and there
The super surface of laser light source, the polarizer, convex lens, micro-nano structure, analyzer and the filter plate of connection；Described device is inclined for realizing line
The multiplexing of Spatial transmission hologram image or the multiplexing of complex amplitude hologram image when light incident light；Or
Described device include the laser light source being sequentially connected in series, the polarizer, quarter wave plate, convex lens, the super surface of micro-nano structure,
Quarter wave plate, analyzer and filter plate；When described device is for realizing rotatory polarization incident light Spatial transmission hologram image multiplexing or
The multiplexing of complex amplitude hologram image.
According to an aspect of the present invention, a kind of hologram image multiplex system is also provided, comprising:
Phase information module is obtained, for being based on micro-nano structure, acquisition reappears different hologram images on a different frequency
When every width hologram image each pixel phase information；
Phase coding modulation module, for being based on the phase information, to the Spatial transmission unit of the micro-nano structure into
The corresponding phase coding modulation of row；
Holography multiplexing Rendering module obtains not for the micro-nano structure after the incident light beam strikes coding with different polarization states
The reproduction image of same hologram image.
The application proposes a kind of hologram image multiplexing method and system based on frequency doubling non-linear and polarization characteristic, passes through fortune
Surpass the difference for the Spatial transmission that polarity corresponding relationship is formed under the SHG properties of surfacing, and different frequencys multiplication with micro-nano structure,
Phase coding modulation is carried out to the Spatial transmission unit of micro-nano structure, and obtains the reproduction of several hologram images；It is sieved by image
The influence of the ambient noise of reproduction result is eliminated in choosing.A complex amplitude tune is formed in addition, combining by two Spatial transmission units
Unit processed carrys out modulated pixels member, carries out nonlinear complex amplitude modulation, obtains more image complex amplitude modulation holograms.
Detailed description of the invention
Fig. 1 is a kind of hologram image multiplexing method flow chart of the present invention；
Fig. 2 is micro-nano structure embodiment schematic diagram of the present invention；
Fig. 3 is a kind of hologram image multiplexing method embodiment schematic diagram of the present invention；
Hologram image multiplexer schematic diagram when Fig. 4 is incident ray polarisation of the present invention；
Hologram image multiplexer schematic diagram when Fig. 5 is incident light rotatory polarization of the present invention；
Fig. 6 is a kind of hologram image multiplex system schematic diagram of the present invention.
Description of symbols
1, Spatial transmission unit, 2, micro-nano structure, 3, incident light, 4, emergent light, 5, different holograms, 6, laser light
Source, 7, the polarizer, 8, quarter wave plate, 9, convex lens, 10, quarter wave plate, 11, analyzer, 12, filter plate.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
The present invention is based on frequency doubling non-linear and the hologram image multiplexing method and system of polarization characteristic, consider to enter when incident light
It is mapped on the nano-antenna unit for the micro-nano structure that azimuth is θ, emergent light can be made to form the geometry texture modulation of 2 θ of size；
Every phase modulation unit of micro-nano structure is encoded with this, is just able to achieve the reproduction of phase hologram.
Simultaneously when calculating holographic, using the nonlinear characteristic of micro-nano structure realize the multiplexing to incident light and to multiple figures
As carrying out holographic reproduction.
According to the nonlinear characteristic of micro-nano structure, polarization intensity P and external electric field E meet formula:
Wherein, ε0For permittivity of vacuum, χ(n)For the n rank tensor of polarizability, special, χ(1)For linear polarization rate.Thus
It is found that generating polarity effect after being incident to micro-nano structure under incident light different polarization obtains different components, each level polarization intensity
Meet:
Wherein, n=1,2,3 ...,For incident optical signal.Each level generation electric field frequency is as a result,
Frequency multiplication occurs for n times of incident electric fields frequency, emergent light.
Wherein, the basic principle that Spatial transmission is linear modulation is carried out using the fundamental component of n=1.Non-linear modulation
It can be by using filter plate to the emergent light optical wavelength after the different multiple-frequency modulations of progress in reproduction optical path from conventional linear modulation
It is selected and is realized.
According to non-linear modulation principle, an a micro-nano structure i.e. Spatial transmission unit has not under the conditions of different frequencys multiplication
Same modulation result.By taking Spatial transmission as an example, it is micro-nano that identical micro-nano structure can generate size to the emergent light of different frequencys multiplication
The Spatial transmission result of structure direction angle different multiples.
The result generated for the different Spatial transmissions of the same micro-nano structure under different frequencys multiplication compiles hologram image
Code is just able to achieve identical frequency incident light, the holographic reproduction of the different images under difference outgoing light frequency.
Since different images are encoded on a different frequency, a certain reproduction reproduced under light frequency can be obtained by filtering
Picture realizes for holographic display result that the micro-nano hologram based on nonlinear characteristic largely disappears compared to linear modulation
In addition to the influence of ambient noise.
As shown in Figure 1, a kind of hologram image multiplexing method, comprising:
S1 is based on micro-nano structure, obtains and reappears the every of every width hologram image when different hologram images on a different frequency
The phase information of a pixel；
S2 is based on the phase information, carries out corresponding phase coding tune to the Spatial transmission unit of the micro-nano structure
System；
S3 obtains the reproduction of different hologram images with the micro-nano structure after the incident light beam strikes coding of different polarization states
Image.
For non-linear micro-nano structure, dipole moment, which can be decomposed into two faces, rotates pole span (being indicated respectively by σ and-σ).
Therefore, two polarization intensity components may be expressed as:
Wherein, θ is the azimuth of micro-nano modulation unit.It follows that in the n times harmonics emergent light and incident light of investigation
When polarization state property difference, the geometry texture of (n-1) σ θ can be introduced；When polarization state property is identical, then the several of (n+1) σ θ can be introduced
He Weixiang.It follows that when the polarised light phase being incident on micro-nano modulated structure simultaneously as the polarization of non-linear micro-nano structure
The azimuth of step response, the same modulation unit can form different Spatial transmission results in the emergent light of different frequency.
When being encoded, since n θ and 2 π+n θ, -2 π+n θ, such as θ are identical as the modulation result of 2 π+θ, -2 π+θ, 2 θ
Identical as the modulation result of+2 θ of 2 π ,+2 θ of -2 π, 3 θ are identical as the modulation result of+3 θ of 2 π ,+3 θ of -2 π, therefore, set by algorithm
Meter can make the modulation result of a certain azimuth satisfaction at each frequency, so that the azimuth realization size of same modulation unit is
Azimuthal n times of Spatial transmission, the Spatial transmission for keeping these multiples different correspond to reproduction image needed for different frequency
Phase information.Therefore, in the specific implementation, can be carried out by azimuth of the optimization algorithm to the Spatial transmission unit of micro-nano structure
Design, to obtain different phase holograms under different outgoing frequencies of light.
As an optional embodiment, the S1 further comprises:
S1.1 determines the incident light frequency of the micro-nano structure；
S1.2 calculates separately the emergent light of the micro-nano structure in the fundamental frequency and frequency multiplication of the incident light frequency at least one
The phase information of each pixel of width hologram image.
This step is that phase information required for reproducing on a different frequency to hologram image calculates, and the present invention realizes
The multiplexing technology for realizing hologram image is modulated to the Spatial transmission unit of the micro-nano structure, naturally it is also possible to only modulation one
Width figure, therefore the phase information includes the phase information of one or more image.
When it is implemented, can be with the Fidoc algorithm for calculating phase hologram, to the difference that need to be loaded in different frequencys multiplication
Image carries out successive ignition calculating according to the reproduction light wave elongate member needed for it and carries out certain adjustment, and acquisition is able to satisfy each
The position phase element of modulation result under frequency answers it in different multiplying at the azimuth of the Spatial transmission unit by micro-nano structure
It is able to achieve the Spatial transmission that size is azimuthal n times, now so as to correspond to needed for different frequency the position phase for reappearing image
Information obtains different phase holograms.
As an optional embodiment, the S2 further comprises:
As unit of the single Spatial transmission unit of the micro-nano structure, according to the phase information to the Spatial transmission
Unit carries out phase coding, realizes Spatial transmission；Or
As unit of the every two Spatial transmission unit of the micro-nano structure, institute's rheme is mutually adjusted according to the phase information
Unit processed carries out phase coding, realizes double Spatial transmissions.
To the multiplexing technology of hologram image the Spatial transmission multiplexing based on micro-nano structure not only may be implemented, also in the present invention
The complex amplitude modulation based on micro-nano structure may be implemented.When realizing complex amplitude modulation, specifically by the micro-nano structure
Every two Spatial transmission dividing elements be a complex amplitude modulation unit, by the light after two Spatial transmission cells modulates
Superposition obtains complex amplitude modulation effect, to realize the complex amplitude modulation multiplex technology to hologram image.
When incident light frequency is ω, under the fundamental frequency that outgoing light frequency is ω, single modulation unit realizes 2 θ respectively1With 2 θ2
Spatial transmission, then modulation unit combine the pixel elements to be formed modulation result meet:
Wherein, AaFor the amplitude information that obtains after modulation,For new geometry texture information, θ1And θ2Pass through optimization algorithm
It obtains.
It is secondary 2 ω of harmonics for outgoing light frequency, when the characteristic of outgoing, incident light is identical and different, pixel elements tune
Result processed meets respectively:
Wherein, Ab、AcFor the amplitude information that obtains after modulation,For new geometry texture information.In this way, just leading to
More image complex amplitude codings are realized in the combination for crossing non-linear micro-nano structure.
As shown in Fig. 2, be micro-nano structure embodiment schematic diagram of the present invention, micro-nano structure 2 described in the present embodiment by
Nano-antenna structure composition forms super surface, and each metal bar is as a Spatial transmission unit 1, two Spatial transmission units 1
A complex amplitude modulation unit can be formed.The present invention is modulated reality by the azimuth angle theta to nano-antenna as shown in Figure 2
Existing Spatial transmission, or the azimuth angle theta by two nano-antennas1And θ2It is modulated and realizes complex amplitude modulation.
During the holographic multiplexing based on nonlinear characteristic, single nano-antenna can incident light different frequencys multiplication and
The position that additional magnitude is n θ under polarization corresponding relationship is mutually modulated, and entire micro-nano structure 2 surpasses the Spatial transmission unit on surface
Different hologram images can then be reappeared at different conditions accordingly.
As an optional embodiment, the S3 further comprises:
S3.1 is based on the incident light frequency, obtains rotatory polarization or line polarisation incident light；
S3.2 is based on the rotatory polarization, respectively with right-handed rotation and/or the incident micro-nano structure of left-handed rotation, obtains several
The reproduction image of hologram image；Or
Based on line polarisation, respectively with the direction x line polarisation and/or the incident micro-nano structure of the direction y line polarisation, several are obtained
The reproduction image of hologram image.
Incident light has different polarization states when the present invention realizes the multiplexing of hologram image, utilizes the difference of each harmonic frequency components
The different Spatial transmissions of identical Spatial transmission unit are as a result, make greatly increasing for the reproduction quantity of hologram image under polarization state.
Specifically, the polarization state different in conjunction with the frequency doubling non-linear's characteristic and incident light of micro-nano structure, to the micro-nano
The Spatial transmission unit of structure carries out Spatial transmission and complex amplitude modulation includes first embodiment, second embodiment, third implementation
Example and fourth embodiment.
First embodiment of the invention realizes that the phase hologram of hologram image is multiplexed using rotatory polarization as incident light.
When rotatory polarization is as incident light, there are right-handed rotation incidence and the incident two kinds of situations of left-handed rotation；And emergent light, there is also
Left-handed component and right hand component.
For formula (4) and formula (5), σ=1 when defining right-handed rotation, σ=- 1 when left-handed rotation.
When incident light is right-handed rotation and frequency is ω, the fundamental frequency emergent light for being ω for frequency, n=1.Investigate emergent light
Right hand component when, it is identical as the polarization of incident light, then the geometry texture introduced be 0；It is inclined with incident light when investigating left-handed component
Vibration property is on the contrary, then introduce the geometry texture of 2 θ.The emergent light for being 2 ω for frequency, n=2.Investigate the right hand component of emergent light
When, the geometry texture of introducing is θ, when investigating left-handed component, introduces the geometry texture of 3 θ.
When incident light is left-handed rotation and frequency is ω, the emergent light for being ω for frequency investigates the dextrorotation point of emergent light
When amount, the geometry texture of introducing is -2 θ, and when investigating left-handed component, then introducing geometry texture is 0；The outgoing for being 2 ω for frequency
Light, when investigating the right hand component of emergent light, the geometry texture of introducing is -3 θ, when investigating left-handed component, the geometry position of introducing-θ
Phase.
Due to when introducing geometry texture is 0, not forming Spatial transmission as a result, but will form strong background light field, thus this
Invention does not select to introduce geometry texture as 0 progress Spatial transmission.
For rotatory polarization condition of incidence, when being emitted light frequency is ω, the Spatial transmission situation of generation is as shown in the table:
When being emitted light frequency is 2 ω, the Spatial transmission situation of generation is as shown in the table:
Rotatory polarization incident optical energy forms six groups of different Spatial transmission modes as a result, can introduce phase by emergent light respectively
To-the 3 of the deflection of the Spatial transmission unit of the micro-nano structure, -2, -1,1,2,3 times of Spatial transmission result.
Second embodiment of the invention realizes that the phase hologram of hologram image is multiplexed using line polarisation as incident light.
Equally, using the corresponding relationship between line polarisation incidence and emergent light, different positions can be also obtained under each frequency multiplication
Phase modulation result.By the setting direction x line polarisation and the direction y line polarisation, the Spatial transmission result similar with rotatory polarization is obtained.
Likewise, due to when introducing geometry texture is 0, do not form Spatial transmission as a result, but will form strong background light field,
Thus the present invention does not select to introduce geometry texture as 0 progress Spatial transmission.
When incident light frequency is ω, and outgoing light frequency is ω fundamental frequency, the Spatial transmission situation of generation is as shown in the table:
When being emitted light frequency is 2 ω, the Spatial transmission situation of generation is as shown in the table:
Line polarisation incident optical energy forms six groups of different Spatial transmission modes as a result, can introduce phase by emergent light respectively
To-the 3 of the deflection of the Spatial transmission unit of the micro-nano structure, -2, -1,1,2,3 times of Spatial transmission result.
Third embodiment of the invention and fourth embodiment form a multiple vibration using the combination of two Spatial transmission units
Width modulation unit obtains the pixel elements of complex amplitude modulation.It, equally can be in different modulating frequency with the nonlinear characteristic of micro-nano material
Complex amplitude modulation is carried out under rate and different rotatory polarizations.
Third embodiment of the invention realizes that the complex amplitude holography of hologram image is multiplexed using rotatory polarization as incident light.
It is modulated using fundamental frequency and two frequencys multiplication, the item for being θ in the deflection of the Spatial transmission unit of the micro-nano structure
Under part, different positions is realized to the emergent light of different frequency and polarization state under a certain rotatory polarization using single micro-nano modulation unit
Mutually modulate.By taking right-handed rotation is incident as an example, in fundamental frequency omega, it is mutually 2 θ that emergent light, which introduces bits of modulation,；In two frequencys multiplication, emergent light
It is mutually θ that right hand component, which introduces bits of modulation, and right hand component introduces 3 θ of bits of modulation phase.By to micro-nano structure described under different condition
The azimuth of Spatial transmission unit is combined coded modulation, can obtain the result of complex amplitude modulation.
It based on the above analysis, is realized by dibit phase modulation unit, due to the azimuth difference of two Spatial transmission units
For θ1And θ2, when incident light is rotatory polarization right-handed rotation, 2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency1、
2θ2；And/or the geometry texture θ of right hand component when two frequency multiplication of emergent light1、θ2And 3 θ of geometry texture of left-handed component1、3
θ2。
Fourth embodiment of the invention realizes that the complex amplitude holography of hologram image is multiplexed using line polarisation as incident light.
It is modulated using fundamental frequency and two frequencys multiplication, when incident light is the direction x line polarisation and frequency is ω, in fundamental frequency omega,
It is mutually 2 θ that emergent light, which introduces bits of modulation,；In two frequencys multiplication, it is mutually θ, the direction y that the direction the x polarized component of emergent light, which introduces bits of modulation,
Polarized component introduces 3 θ of bits of modulation phase.Group is carried out by the Spatial transmission unit to the micro-nano structure under the conditions of different line polarisations
Coded modulation is closed, the result of complex amplitude modulation can be obtained.
It based on the above analysis, is realized by dibit phase modulation unit, due to the azimuth difference of two Spatial transmission units
For θ1And θ2, when incident light is the direction x line polarisation, the geometry texture 2 of the direction y line polarisation when obtaining the emergent light fundamental frequency
θ1、2θ2And/or 3 θ of geometry texture of the direction y line polarisation when two frequency multiplication of emergent light1、3θ2And the direction x line polarisation is several
He Weixiang θ1、θ2。
As shown in figure 3, for a kind of hologram image multiplexing method embodiment schematic diagram of the present invention, the incident micro-nano knot of incident light 3
Structure 2 surpasses surface, and different hologram images 5 is formed by emergent light 4.Specific steps include:
Step 1: to the position phase for each pixel that several hologram images are calculated with the every width hologram image of acquisition that needs reproduce
Information has carried out volume corresponding with the phase information according to Spatial transmission unit of the phase information of calculating to micro-nano structure
Code, that is, adjust the azimuth of each Spatial transmission unit, is encoded by arrangement, realizes on identical holographic plate to several figures
The record of picture.
Step 2: passing through laser light source, the polarizer, quarter wave plate, convex lens, analyzer, filter plate and the super table of micro-nano structure
Required linearly polarized light or circularly polarized light can be obtained as incident light in the combination in face.Specifically combination is according to incident light
Linearly polarized light either circularly polarized light and it is different.
Step 3: incident light passes through the super surface being made of linear micro-nano structure, and emergent light carries out frequency sieve by filter plate
Choosing obtains the hologram image reappeared under required frequency.
The combination of device in step 2, according to incident light be linearly polarized light either circularly polarized light and it is different.When
When incident light is rotatory polarization, need after the polarizer plus quarter wave plate.And in order to which the polarized component to emergent light is screened,
After through super surface hologram, emergent light need to using after quarter wave plate by analyzer, thus needed for being designed with
The identical or opposite emergent light of incident light rotation direction；When incident light is line polarisation, then quarter wave plate is not needed, it specifically can be referring to Fig. 4
And Fig. 5.
A kind of hologram image multiplexer as shown in Figure 4, described device include the laser light source 6 being sequentially connected in series, are polarized
Device 7, convex lens 8, micro-nano structure 2 surpass surface, analyzer 11 and filter plate 12；When described device is for realizing line polarisation incident light
Spatial transmission hologram image multiplexing or complex amplitude hologram image multiplexing.
A kind of hologram image multiplexer as shown in Figure 5, described device include the laser light source being sequentially connected in series, are polarized
The super surface of device, quarter wave plate, convex lens, micro-nano structure, quarter wave plate, analyzer and filter plate；Described device is inclined for realizing circle
The multiplexing of Spatial transmission hologram image or the multiplexing of complex amplitude hologram image when light incident light.
In Fig. 3, the polarization state of incident light 3 and emergent light 4 can be with are as follows:
Under rotatory polarization condition of incidence, there are four types of optional situations: 1. incident light 3 is right-handed rotation, and emergent light 4 is right-handed rotation；②
Incident light 3 is right-handed rotation, and emergent light 4 is left-handed rotation；3. incident light 3 is left-handed rotation, emergent light 4 is right-handed rotation；4. incident light 3 is
Left-handed rotation, emergent light 4 are left-handed rotation.According to the selection of different polarization states corresponding relationship, different phase-modulation results is obtained.
Under line polarisation condition of incidence, there are four types of optional situations: 1. incident light 3 is the direction x polarised light, and emergent light 4 is the direction x
Polarised light；2. incident light 3 is the direction x polarised light, emergent light 4 is the direction y polarised light；3. incident light 3 is the direction y polarised light, out
Penetrating light 4 is the direction x polarised light；4. incident light 3 is the direction y polarised light, emergent light 4 is the direction y polarised light.According to different polarization states
The selection of corresponding relationship obtains different phase-modulation results.
As shown in fig. 6, the present invention also provides a kind of hologram image multiplex systems, comprising:
Phase information module is obtained, for being based on micro-nano structure, acquisition reappears different hologram images on a different frequency
When every width hologram image each pixel phase information；
Phase coding modulation module, for being based on the phase information, to the Spatial transmission unit of the micro-nano structure into
The corresponding phase coding modulation of row；
Holography multiplexing Rendering module obtains not for the micro-nano structure after the incident light beam strikes coding with different polarization states
The reproduction image of same hologram image.
Main technical schemes of the invention include:
1, according to the nonlinear characteristic of micro-nano material, in a branch of incident light beam strikes to the super surfacing of non-linear micro-nano structure
When upper, a variety of non-interfering emergent lights such as fundamental frequency, two frequencys multiplication, frequency tripling were generated under nonlinear resonance condition, pass through filtering
Piece carries out screening to emergent light and obtains different hologram images under different frequency, while background when reducing image reproduction is made an uproar
Sound.
2, it is changed according to the incident light projected on micro-nano structure from the emergent light polarity corresponding relationship of different frequencys multiplication
When the geometric phase that introduces it is different, to realize the reproduction process of the different holograms under opposed polarity corresponding relationship.
3, in order to realize that complex amplitude is modulated, two non-linear micro-nano structure phase modulation units is combined, are divided into
One complex amplitude modulation unit obtains amplitude modulation and new phase-modulation result by two phase-modulation results addeds.Again
Because of the nonlinear characteristic of micro-nano structure, then the complex amplitude holography for being able to achieve more images is shown.
It is formed the present invention is based on polarity corresponding relationship under the SHG properties that micro-nano structure surpasses surfacing, and different frequencys multiplication
The difference of Spatial transmission, using it is precalculated reappear different hologram images on a different frequency when every width hologram image
The phase information of each pixel carries out phase coding modulation to the Spatial transmission unit of micro-nano structure, and obtains several holograms
The reproduction of picture.
Finally, the present processes are only preferable embodiment, it is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in protection of the invention
Within the scope of.
Claims (10)
1. a kind of hologram image multiplexing method characterized by comprising
S1, frequency doubling non-linear's characteristic based on micro-nano structure, acquisition reappear every width when different hologram images on a different frequency
The phase information of each pixel of hologram image；
S2 is based on the phase information, carries out corresponding phase coding modulation to the Spatial transmission unit of the micro-nano structure；
S3 obtains the reproduction image of different hologram images with the micro-nano structure after the incident light beam strikes coding of different polarization states.
2. method as described in claim 1, which is characterized in that the S1 further comprises:
S1.1 determines the incident light frequency of the micro-nano structure；
It is complete to calculate separately the emergent light of a micro-nano structure at least width in the fundamental frequency and frequency multiplication of the incident light frequency by S1.2
Cease the phase information of each pixel of image.
3. method as claimed in claim 2, which is characterized in that the S2 further comprises:
As unit of the single Spatial transmission unit of the micro-nano structure, according to the phase information to the Spatial transmission unit
Phase coding is carried out, realizes Spatial transmission；Or
As unit of the every two Spatial transmission unit of the micro-nano structure, according to the phase information to the Spatial transmission list
Member carries out phase coding, realizes double Spatial transmissions.
4. method as claimed in claim 3, which is characterized in that the S3 further comprises:
S3.1 is based on the incident light frequency, obtains rotatory polarization or line polarisation incident light；
S3.2 is based on the rotatory polarization, respectively with right-handed rotation and/or the incident micro-nano structure of left-handed rotation, obtains several holographies
The reproduction image of image；Or
Based on line polarisation, respectively with the direction x line polarisation and/or the incident micro-nano structure of the direction y line polarisation, several holographies are obtained
The reproduction image of image.
5. method as claimed in claim 4, which is characterized in that the S1.2 further comprises:
When incident light is rotatory polarization right-handed rotation, 2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency, and/or
The geometry texture θ of right hand component when two frequency multiplication of emergent light and 3 θ of geometry texture of left-handed component；And/or
When incident light is rotatory polarization left-handed rotation, -2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency, and/
Or right hand component when two frequency multiplication of emergent light -3 θ of geometry texture and left-handed component geometry texture-θ；
Wherein, θ is the azimuth of the Spatial transmission unit of the micro-nano structure.
6. method as claimed in claim 4, which is characterized in that the S1.2 further comprises:
When incident light is the direction x line polarisation, 2 θ of geometry texture of the direction y line polarisation when obtaining the emergent light fundamental frequency, and/
Or the geometry texture θ of 3 direction the θ and x line polarisation of geometry texture of the direction y line polarisation when two frequency multiplication of emergent light；And/or
When incident light is the direction y line polarisation, -2 θ of geometry texture of the direction x line polarisation when obtaining the emergent light fundamental frequency,
And/or -3 θ of geometry texture of the direction the geometry texture-θ and x line polarisation of the direction y line polarisation when two frequency multiplication of emergent light；
Wherein, θ is the azimuth of the Spatial transmission unit of the micro-nano structure.
7. method as claimed in claim 4, which is characterized in that double Spatial transmissions described in the S2 include:
When incident light is rotatory polarization right-handed rotation, 2 θ of geometry texture of left-handed component when obtaining the emergent light fundamental frequency1、2θ2；
And/or the geometry texture θ of right hand component when two frequency multiplication of emergent light1、θ2And 3 θ of geometry texture of left-handed component1、3θ2；
Wherein, θ1And θ2It is divided into the azimuth of two Spatial transmission units of complex amplitude modulation unit.
8. method as claimed in claim 4, which is characterized in that double Spatial transmissions described in the S2 include:
When incident light is the direction x line polarisation, 2 θ of geometry texture of the direction y line polarisation when obtaining the emergent light fundamental frequency1、2
θ2And/or 3 θ of geometry texture of the direction y line polarisation when two frequency multiplication of emergent light1、3θ2And the geometry position of the direction x line polarisation
Phase θ1、θ2；
Wherein, θ1And θ2It is divided into the azimuth of two Spatial transmission units of complex amplitude modulation unit.
9. a kind of hologram image multiplexer, which is characterized in that described device include the laser light source being sequentially connected in series, the polarizer,
The super surface of convex lens, micro-nano structure, analyzer and filter plate；Spatial transmission when described device is for realizing line polarisation incident light
Hologram image multiplexing or the multiplexing of complex amplitude hologram image；Or
Described device includes the laser light source being sequentially connected in series, the polarizer, quarter wave plate, convex lens, the super surface of micro-nano structure, 1/4 wave
Piece, analyzer and filter plate；The multiplexing of Spatial transmission hologram image or multiple vibration when described device is for realizing rotatory polarization incident light
The multiplexing of width hologram image.
10. a kind of hologram image multiplex system characterized by comprising
Phase information module is obtained, for being based on micro-nano structure, acquisition reappears every when different hologram images on a different frequency
The phase information of each pixel of width hologram image；
Phase coding modulation module carries out phase to the Spatial transmission unit of the micro-nano structure for being based on the phase information
The phase coding modulation answered；
Holography multiplexing Rendering module obtains different for the micro-nano structure after the incident light beam strikes coding with different polarization states
The reproduction image of hologram image.
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