CN110412667A - Multilayered structure optical thin film - Google Patents
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- CN110412667A CN110412667A CN201910644770.2A CN201910644770A CN110412667A CN 110412667 A CN110412667 A CN 110412667A CN 201910644770 A CN201910644770 A CN 201910644770A CN 110412667 A CN110412667 A CN 110412667A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0808—Mirrors having a single reflecting layer
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Abstract
The invention discloses a kind of multilayered structure optical thin films, it includes the second surface of first surface disposed in parallel and opposite side, and the stacking of N number of positive refracting power microbedding, the stacking of positive refracting power microbedding is arranged between first surface and second surface and is set as adjacent microlayers, the refractive index of the N-1 positive refracting power microbedding from first surface to second surface is successively successively decreased, the refractive index of n-th positive refracting power microbedding is greater than the refractive index of the N-1 positive refracting power microbedding, at least provided with one layer of negative index microbedding between n-th positive refracting power microbedding from first surface to second surface, so that multilayered structure optical thin film is for having high reflectance along first surface to second surface incident light, simultaneously, multilayered structure optical thin film is for having high transmittance along second surface to first surface incident light.
Description
Technical field
The present invention relates to communication Material Field more particularly to a kind of multilayered structure with unilateral reflection function are optically thin
Film.
Background technique
Multilayered structure optical film may include the thin layer of various different translucent materials, these layers are referred to as microbedding, because it
It is sufficiently thin so that the transmission and reflection characteristic of optical film is largely the light Xiang Changgan by reflecting at microbedding interface
It relates to and is determined with destructive interference.The phase of the double refraction amount (if any) shown depending on each microbedding and adjacent microlayers
The difference of refractive index and other design characteristics make multilayered structure optical film have special reflection and transmission property.At certain
In a little situations, multilayered structure optical film can be used as reflective polarizer, such as be used as reflector plate in other cases.
In some cases, the thickness of microbedding and refractive index are equivalent to the superposition of 1/4 wavelength, i.e., microbedding is configured to optics
The form of repetitive unit or unit cell, each optical repeat unit or unit cell all have optical thickness (f- ratio=
50%) identical two neighbouring microbeddings, this kind of optical repeat unit can be by constructive interference effectively reflected lights, by reflected light
Wavelength be twice of the total optical thickness of optical repeat unit.And the film of other layer of structure, such as with 2 microbedding optics weights
The multi-layer optical film (its f- ratio is not equal to 50%) or optical repeat unit of multiple unit include the film of more than two microbeddings then
It is to be please referred to by design configurations optical repeat unit with decreasing or increasing certain higher order reflections such as United States Patent (USP) No.5,
360,659 (Arends et al.) and No.5,103,337 (Schrenk et al.).And utilize the thickness along film thickness axis (such as z-axis)
Gradient can provide broader reflection band, such as extend and enter the reflection of near infrared region in the entire visible area of people
Bands of a spectrum, so that microlayer stack can continue in entire visible light when bands of a spectrum are transferred to shorter wavelength at inclined incidence angle
Compose internal reflection.In United States Patent (USP) 6,157,490 (Wheatley et al.), they are to compose by adjusting thickness gradient to sharpen
Belt edge (i.e. high reflection and it is highly transmissive between Wavelength conversion at).But incident light is entering these more microlayer structures materials
By the refraction and reflection of a series of light when material, emergent light dissipates within the scope of larger space so that the directive property of light compared with
Difference.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of multilayered structure optical thin film, make it for unilateral incident
Light has high reflectance, effectively reduces the divergence of light beam, and light is made to generate collimating effect, so as to improve the directive property of light beam,
There is high transmittance simultaneously for the incident light of opposite side, to make the film can be used as reflector plate use, while in the phase of film
The optical signalling of side can be penetrated effectively.
In order to solve the above technical problems, the technical solution adopted by the present invention is that design multilayered structure optical thin film comprising
The second surface and N number of refractive index of first surface disposed in parallel and opposite side are the heap of the positive refracting power microbedding of positive value
It is folded；The phase between the first surface and the second surface and being set as is arranged in the stacking of the positive refracting power microbedding
Adjacent microbedding successively successively decreases from the first surface to the refractive index of N-1 positive refracting power microbedding of the second surface, n-th
The refractive index of positive refracting power microbedding is greater than the refractive index of the N-1 positive refracting power microbedding, from the first surface to described second
At least provided with one layer of negative index microbedding between the n-th positive refracting power microbedding on surface, so that the multilayered structure optics
Film is for having high reflectance, while the multilayered structure optics along the first surface to the second surface incident light
Film is for having high transmittance along the second surface to the first surface incident light.
Multilayered structure optical thin film of the invention is arranged and from the first surface to described by negative index microbedding
The refractive index of N-1 microbedding of second surface is successively successively decreased, and the refractive index of n-th microbedding is greater than the refraction of the N-1 microbedding
Rate, structure design so that light in a limited space in form optical circuit, can be very close the after reflection path
One surface incidence point is emitted, so that optical path is greatly reduced from the ratio that multilayered structure optical thin film side is emitted, thus greatly
Width promotes reflection efficiency, can effectively reduce the divergence of light beam, so that light is generated collimating effect, so as to improve the finger of light beam
Tropism.On the other hand, perpendicular to the light of multilayered structure optical thin film can penetrate multilayered structure optical thin film, so as to
It is acquired positioned at multilayered structure optical thin film second surface side.In addition, having along second surface to first surface incident light
High transmittance.
Preferably, the second surface includes retroeflection unit, such as multiple corner cube reflectors.
Preferably, negative index microbedding shows negative index to visible light.
Preferably, negative index microbedding includes the two-dimensional and periodic of metal array and metal open-loop resonator array composition
Structure.
Preferably, negative index microbedding includes the photonic crystal of periodicity optical bandgap structure.
Preferably, negative index microbedding includes the insulated type ferromagnetic material or insulated type ferrimagnetic material of single negative magnetoconductivity
In plain conductor constitute line array.
Preferably, negative index microbedding further includes transparent material portion, and the transparent material portion is arranged in the negative folding
It penetrates in rate microbedding.
Preferably, multilayered structure optical thin film includes polyethylene naphthalate or its copolymer.
Preferably, multilayered structure optical thin film includes cellulose acetate.
The present invention discloses a kind of optical thin films comprising the stacking of multiple above-mentioned multilayered structure optical thin films.
Detailed description of the invention
The present invention and its advantage will be provided by way of non-limiting example by research, and pass through appended attached drawing institute
The detailed description for the particular implementation shown and better understand, in which:
Fig. 1 is the sectional view of multilayered structure optical thin film in the embodiment of the present invention 1.
Fig. 2 is the sectional view of multilayered structure optical thin film in the embodiment of the present invention 2.
Specific embodiment
Please refer to the schema in attached drawing, wherein identical component symbol represents identical component, the principle of the present invention be with
Implement to illustrate in an environment appropriate.The following description be based on exemplified specific embodiments of the present invention,
It is not construed as the limitation present invention other specific embodiments not detailed herein.
The word " embodiment " used in this specification means serving as example, example or illustration.In addition, this specification and
The article " one " as used in the appended claims can generally be interpreted to mean " one or more ", unless in addition referring to
Determine or understands guiding singular from context.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside",
The orientation or positional relationship of the instructions such as " clockwise ", " counterclockwise " be based on the orientation or positional relationship shown in the drawings, be only for
Convenient for the description present invention and simplify description, rather than the device or element of indication or suggestion meaning there must be specific side
Position is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " setting ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, be also possible to be electrically connected or can mutually communicate；It can be directly connected, centre can also be passed through
Medium is indirectly connected, and can be the connection inside two elements or the interaction relationship of two elements.For the general of this field
For logical technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
Furthermore unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower" can wrap
The first and second features are included directly to contact, also may include the first and second features be not direct contact but by them it
Between other characterisation contact.Moreover, fisrt feature includes fisrt feature above the second feature " above ", " above " and " above "
Right above second feature and oblique upper, or indicate that first feature horizontal height is higher than second feature.Fisrt feature is in the second spy
Sign " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or expression fisrt feature
Level height is less than second feature.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.For
Simplified disclosure of the invention, is hereinafter described the component of specific examples and setting.Certainly, they are merely illustrative, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can
To recognize the application of other techniques and/or the use of other materials.
Embodiment 1
Fig. 1 is please referred to, is the sectional view of multilayered structure optical thin film in the embodiment of the present invention 1 comprising 4 layers of positive refraction
The lamination of rate microbedding 101,102,103,105 and one layer of negative index microbedding 104.101 upper surface of positive refracting power microbedding is the
One surface, 105 lower surface of positive refracting power microbedding are second surface.In the embodiment of the present invention 1, L1 light has not by multilayer
The influence generated with the lamination of positive refracting power microbedding and negative index microbedding is as shown in Figure 1.Negative index microbedding 104 is to visible
Light shows negative index nr.First surface disposed in parallel and the second surface of opposite side pass through 3 positive refracting powers of setting
The refractive index n of microbedding 101,102,1031、n2、n3Successively successively decrease, the refractive index n of the 4th positive refracting power microbedding 1050Greater than the 3rd
The refractive index n of a positive refracting power microbedding 1033, negative index microbedding 104 is set between positive refracting power microbedding 103 and 105,
Structure design forms optical circuit so that light is interior in a limited space, can be in very close first table after reflection path
Face incidence point is emitted, so that optical path is greatly reduced from the ratio that multilayered structure optical thin film side is emitted, thus substantially
Reflection efficiency is promoted, on the other hand, multilayered structure optical thin film can be penetrated perpendicular to the light of multilayered structure optical thin film, from
And it is acquired being located at the multilayered structure optical thin film other side.Multilayered structure optical thin film include polyethylene naphthalate or
Its copolymer.
Negative index functional layer 104 is as shown in Figure 1 to the schematic diagram for the influence that light is propagated.Negative index microbedding 104,
Refractive index nr, the optical characteristics having are that energy of the light in negative index microbedding is opposite with the direction of propagation of phase.Work as light
From the 4th layer of tool is traveled to after the ever-reduced microbedding of multiple positive refracting powers with positive refracting power microbedding (as shown in fig. 1)
When having in negative index microbedding 104, incident ray and refracted light are located at normal (dotted line in Fig. 1 show the boundary of adjacent layer
The normal in face) the same side, to change the direction of propagation of light.As shown in Figure 1, being stacked on negative index microbedding 104
There is positive refracting power microbedding 101,102,103, when incident ray passes through the interface of microbedding 101,102,103 from n1 incidence, refraction
Light and incident ray are located at the opposite side of normal, and refraction angle is gradually increased.It is born when light passes through through positive refracting power microbedding 103
When the interface of refractive index microbedding 104, refracted light and incident ray are in the same side of normal.It is worth noting that, Si Nieer
(Snell) law the anaclasis direction at interface and is not suitable between negative index microbedding and positive refracting power microbedding, but incident
Light still meets snell law in generated refraction angle after reflecting in each microbedding.
It can intuitively be seen by the L1 index path of Fig. 1, be arranged between multiple positive refracting power microbeddings at least one layer of negative
Refractive index microbedding can effectively reduce the divergence of light beam, and light is made to generate collimating effect, so as to improve the directive property of light beam,
L2, L3 index path, which can see multilayered structure optical thin film, has high transmittance for the light of vertical incidence and outgoing, to make
Obtaining has high reflectance along first surface to second surface incident light, meanwhile, multilayered structure optical thin film is for along second surface
There is high transmittance to first surface incident light.
The negative index microlayer materials nature is not naturally occurring in embodiment 1, with metal array and gold
Belong to the two-dimensional periodic structure of open-loop resonator array composition.It is established on the basis of Theory of Electromagnetic Field, and Pendry passes through wheat
Ke Siwei equation and substance constitutive equation are proved material with negative refractive index and can be implemented.Phys.Rev.Lett. is seen,
76,4773-4776(1996).Pass through exploratory development, open-loop resonator of the Smith et al. in 2000 year's harvest material gain metallic coppers
A kind of two-dimensional periodic structure device is formed with conducting wire, realizes the production of material with negative refractive index.It sees
Phys.Rev.Lett.,84,4184-4187(2000).Then, in 2005, Enkrich et al. using by metal array and
The two-dimensional periodic structure of metal open-loop resonator array composition, producing has negative index to wavelength=800nm light
Material sees Phys.Rev.Lett., 95,203901 (2005).
Embodiment 2
Referring to figure 2., be the embodiment of the present invention 2 multilayered structure optical thin film sectional view.Below with regard to embodiment 2
It is illustrated with the similarities and differences of embodiment 1.The structure of Fig. 2 multilayered structure optical thin film includes that 5 layers of positive refracting power microbedding are respectively
201, the lamination of 202,203,205,206 and one layer of negative index microbedding 204,201 upper surface of positive refracting power microbedding are first
Surface, 206 lower surface of positive refracting power microbedding are second surface.In the embodiment of the present invention 2, light L1 has difference by multilayer
The influence that the lamination of positive refracting power microbedding and negative index microbedding generates is as shown in Figure 2.Negative index microbedding 204 is to visible light
Show refractive index nr.First surface disposed in parallel and the second surface of opposite side by the setting of negative index microbedding 204 and
The refractive index n of 4 positive refracting power microbeddings 201,202,203,205 from the first surface to the second surface21、n22、
n23、n24Successively successively decrease, the refractive index n of the 5th positive refracting power microbedding 20620Greater than the refraction of the 4th positive refracting power microbedding 205
Rate n24, negative index microbedding 204 is set between positive refracting power microbedding 203 and 205, and structure design does not make light limited
Space in formed optical circuit, but after reflection path still than no negative index microbedding closer to first surface incidence
Point is emitted, so that the ratio that optical path is emitted from multilayered structure optical thin film side reduces, so that part promotes reflection effect
Rate.Second surface includes multiple corner cube reflectors as retroeflection unit, further promotes the anti-of multilayered structure optical thin film
Penetrate efficiency.On the other hand, multilayered structure optical thin film can be penetrated perpendicular to the light of multilayered structure optical thin film, thus in place
It is acquired in the multilayered structure optical thin film other side.L2, L3 index path can see multilayered structure optical thin film for vertically entering
The light penetrated and be emitted has high transmittance.
The influence schematic diagram that negative index microbedding 204 propagates light is as shown in Figure 2.Negative index microbedding 204, refraction
Rate nr, the optical characteristics having are that energy of the light in negative index microbedding is opposite with the direction of propagation of phase.When light is from tool
There is the material layer (n in such as Fig. 2 of positive refracting power21、n22、n23、n24It is shown) it is passed after the ever-reduced microbedding of multiple positive refracting powers
When being multicast to the 4th layer and having in negative index microbedding, incident ray with refracted light is located at normal, and (dotted line in Fig. 2 shows adjacent
Layer between interface normal) the same side, the direction of propagation of light changes.As shown in Fig. 2, in negative index microbedding 204
On be stacked with positive refracting power microbedding 201,202,203, when incident ray is from n21Incidence is by 201,202,203 interface of microbedding
When, refracted light is located at the opposite side of normal with incident ray, and refraction angle is gradually increased.When light is through positive refracting power microbedding 203
By negative index microbedding 204 interface when, refracted light and incident ray are in the same side of normal.Equally, Si Nieer
(Snell) law is not suitable for the anaclasis direction at the interface between material with negative refractive index layer and positive refracting power material layer, still
Incident ray still meets snell law in generated refraction angle after reflecting in each material.
It include transparent material portion in negative index microbedding 204, and the transparent material portion is arranged in the negative index
In microbedding 204, it can be ensured that natural light can have stronger penetration power, enhance the effect of perspective, to realize more naturally true
Real visual experience.Multilayered structure optical thin film includes cellulose acetate.Negative index microbedding in embodiment of the disclosure
Material has negative index to visible light, and wherein negative index microbedding includes the photonic crystal of periodicity optical bandgap structure.
In various embodiments, a kind of multilayered structure optical thin film is disclosed.Contain negative index in the optical thin film
Functional layer, the layer have negative index to light, again by that can reduce light after negative index after light passes through positive refracting power layer
Divergence, improve degree of collimation so that utilization efficiency of the light in plural layers is greatly improved, to reduce energy
The loss of amount reduces product cost, increases display brightness, reduces the thickness of equipment.
The above, the only specific embodiment of the disclosure, but disclosed protection scope is not limited thereto, and is appointed
What ordinary skill is in the technical scope that the disclosure discloses, and any changes or substitutions that can be easily thought of, should all cover at this
In disclosed protection scope.Therefore, the invention is not limited to specific embodiments disclosed herein, but including falling into right
All technical solutions in the range of it is required that.
Claims (10)
1. a kind of multilayered structure optical thin film comprising:
The stacking of the second surface and N number of positive refracting power microbedding of first surface disposed in parallel and opposite side, the positive refraction
The stacking of rate microbedding is arranged between the first surface and the second surface and is set as adjacent microlayers, and feature exists
In successively successively decreasing from the first surface to the refractive index of N-1 positive refracting power microbedding of the second surface, n-th is just rolled over
The refractive index for penetrating rate microbedding is greater than the refractive index of the N-1 positive refracting power microbedding, from the first surface to the second surface
N-th positive refracting power microbedding between at least provided with one layer of negative index microbedding so that the multilayered structure optical thin film pair
In along the first surface to the second surface incident light have high reflectance, meanwhile, the multilayered structure optical thin film pair
In along the second surface to the first surface incident light have high transmittance.
2. multilayered structure optical thin film according to claim 1, the second surface includes retroeflection unit.
3. multilayered structure optical thin film according to claim 1, the negative index microbedding shows negative folding to visible light
Penetrate rate.
4. multilayered structure optical thin film according to claim 1, the negative index microbedding includes metal array and metal
The two-dimensional periodic structure of open-loop resonator array composition.
5. multilayered structure optical thin film according to claim 1, the negative index microbedding includes periodicity optical band gap
The photonic crystal of structure.
6. multilayered structure optical thin film according to claim 1, the negative index microbedding includes the exhausted of single negative magnetoconductivity
The line array that plain conductor in edge type ferromagnetic material or insulated type ferrimagnetic material is constituted.
7. multilayered structure optical thin film according to claim 1, the negative index microbedding further includes transparent material portion, and
And the transparent material portion is arranged in the negative index microbedding.
8. multilayered structure optical thin film according to claim 1, the multilayered structure optical thin film includes poly- naphthalenedicarboxylic acid
Glycol ester or its copolymer.
9. multilayered structure optical thin film according to claim 1, the multilayered structure optical thin film includes cellulose acetate.
10. a kind of optical thin film comprising any multilayered structure optical thin film of multiple claim 1-9.
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| CN113156642A (en) * | 2021-04-14 | 2021-07-23 | 清华大学 | Transmission type image differential device and image edge extraction system formed by same |
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| CN110853801B (en) * | 2019-11-15 | 2021-10-22 | 苏州大学 | Transparent electrode, photovoltaic cell, electronic device and preparation method of transparent electrode |
| CN113156642A (en) * | 2021-04-14 | 2021-07-23 | 清华大学 | Transmission type image differential device and image edge extraction system formed by same |
| CN113156642B (en) * | 2021-04-14 | 2022-07-05 | 清华大学 | Transmission type image differential device and image edge extraction system formed by same |
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