CN111025667B - Chiral optical element and optical encryption method - Google Patents
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Abstract
The invention provides a chiral optical element and an optical encryption method, and relates to the technical field of optical encryption. The chiral optical element provided by the invention is a brand-new optical encryption device, is easy to process, has high confidentiality and has the characteristics of miniaturization and integration.
Description
Technical Field
The invention relates to the technical field of optical encryption, in particular to a chiral optical element and an optical encryption method.
Background
Optical encryption technology is one of the important research fields of modern optics, and the development is rapid in recent years. Currently, the internationally existing optical encryption methods are mostly based on the control of the phase of the optical wave, such as digital holography, fourier transform, and phase encoding. The optical encryption techniques described above all need to realize precise control and encoding of optical wave phase, and still have many disadvantages in terms of ease of use, flexibility and implementability.
Disclosure of Invention
The invention aims to provide a chiral optical element and an optical encryption method, so as to provide a brand-new optical encryption microstructure device.
In a first aspect, the chiral optical element provided by the present invention has dichroism, and is configured to show secret related information under irradiation of left-handed polarized light or right-handed polarized light, and hide the secret related information under irradiation of wide-band natural light or linearly polarized light.
With reference to the first aspect, the present disclosure provides a first possible implementation manner of the first aspect, wherein the chiral optical element includes a first chiral member having dichroism.
In combination with the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the chiral optical element further comprises a second chiral component having dichroism, and the chirality of the first chiral component is opposite to that of the second chiral component.
In combination with the second possible implementation manner of the first aspect, the present disclosure provides a third possible implementation manner of the first aspect, wherein the first and second manual parts each include a convex portion having a square cross section.
In combination with the third possible implementation manner of the first aspect, the present disclosure provides a fourth possible implementation manner of the first aspect, wherein the chiral optical element further includes a substrate, and the protrusion is connected to the substrate.
In combination with the third possible implementation form of the first aspect, the present disclosure provides a fifth possible implementation form of the first aspect, wherein the chiral optical element comprises a first gold layer.
With reference to the third possible implementation manner of the first aspect, the present invention provides a sixth possible implementation manner of the first aspect, wherein a photoresist layer is disposed between the first gold layer and the substrate.
With reference to the sixth possible implementation manner of the first aspect, the present invention provides a seventh possible implementation manner of the first aspect, wherein a first chromium layer is disposed between the photoresist layer and the first gold layer.
With reference to the sixth possible implementation manner of the first aspect, the present invention provides an eighth possible implementation manner of the first aspect, wherein the first and second manual components each include: a second chromium layer and a second gold layer; the second chromium layer is coated on one side surface of the substrate facing the bulge, and the second gold layer is coated on the second chromium layer; and the second chromium layer and the second gold layer are respectively surrounded by the photoresist layer.
In a second aspect, the present invention provides an optical encryption method, including: marking the confidential information by adopting a chiral optical element with dichroism; in an encrypted state, the chiral optical element is irradiated by wide-spectrum natural light or linearly polarized light; in the decrypted state, the chiral optical element is illuminated with either left-handed polarized light or right-handed polarized light.
The embodiment of the invention has the following beneficial effects: the optical encryption device adopts the chiral optical element with dichroism, the chiral optical element is configured to show secret-related information under the irradiation of left-handed polarized light or right-handed polarized light, the secret-related information is hidden under the irradiation of wide-spectrum natural light or linearly polarized light, and the optical encryption is realized through the chiral optical element, so that a brand new optical encryption scheme is provided, and the miniaturization and integration of the optical encryption device are realized.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a top view of a chiral optical element provided by an embodiment of the present invention;
FIG. 2 is a first schematic diagram illustrating a first partial view of a chiral optical element according to an embodiment of the present invention;
FIG. 3 is a partial schematic view of a second chiral optical element according to an embodiment of the present invention;
fig. 4 is a graph of experimental test results of chiral transmission spectra of a chiral optical element according to an embodiment of the present invention, where: the image a is an experimental relationship graph of the light field wavelength and the transmissivity of the first chiral component; image b is an experimental plot of light field wavelength versus transmittance for the second chiral element;
fig. 5 is a graph of a calculation result of a chiral transmission spectrum of a chiral optical element according to an embodiment of the present invention, where: the image c is a theoretical relation graph of the light field wavelength and the transmittance of the first chiral component; image d is a theoretical relationship graph of light field wavelength and transmittance of the second chiral element;
fig. 6 is an effect diagram of optical encryption using a chiral optical element according to an embodiment of the present invention, where: the effect graph e is an effect graph under the irradiation of wide-spectrum natural light; the effect graph f is an effect graph under the irradiation of 750nm left-handed polarized light; the effect graph g is an effect graph under the irradiation of 750nm linearly polarized light; the effect graph h is an effect graph under the irradiation of 750nm right-handed polarized light.
Icon: 100-a first chiral component; 200-a second chiral component; 300-a substrate; 001-first gold layer; 002-a first chromium layer; 003-photoresist layer; 004-a second chromium layer; 005-a second gold layer; x-the reference direction; LCP-levorotatory optical field; RCP-right-handed light field.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
The chiral optical element provided by the embodiment of the invention has dichroism, and is configured to show secret related information under the irradiation of left-handed polarized light or right-handed polarized light and hide the secret related information under the irradiation of wide-band natural light or linearly polarized light.
Specifically, the chiral optical element has dichroism, and under the incidence of wide-spectrum natural light or linearly polarized light, the transmissivity of the chiral optical element is the same as that of the substrate, so that the secret-related information is hidden; under the incidence of a left-handed light field LCP or a right-handed light field RCP, the transmissivity of the chiral optical element relative to the substrate changes, and the contrast between the substrate and the chiral optical element containing the confidential information is increased, so that the chiral optical element displays the confidential information.
As shown in fig. 6, taking the encrypted information as the letter R as an example, the confidential information is marked using an optical element of left-handed chirality, and an optical element having right-handed chirality is used as a contrast. Under wide-band natural light illumination, see effect diagram e, the letter R is completely hidden. Under left-handed polarized light illumination, the optical element with left-handed chirality has lower transmittance than the contrast area, see effect diagram f, where the letter R is revealed and the intensity is darker compared to the contrast area. Under illumination with linearly polarized light, the letter R is hidden, see effect diagram g. Under illumination with right-handed polarized light, the optical element with left-handed chirality has a higher transmittance than the contrast region, see effect diagram h, where the letter R is revealed with a brighter intensity compared to the contrast region. The display of the confidential information can be realized by utilizing the change of the transmissivity of the chiral optical element with dichroism under the irradiation of circularly polarized light, and the confidential information can be hidden under the irradiation of wide-spectrum natural light or linearly polarized light, so that the method has the advantages of easy realization of encryption and high confidentiality.
As shown in fig. 1 and 2, in an embodiment of the present invention, a chiral optical element includes a first chiral member 100 having dichroism. Wherein the first chiral member 100 is configured to have a left-handed chirality, and the transmittance under the irradiation of the left-handed polarized light is lower than that under the irradiation of the right-handed polarized light; alternatively, the first chiral member 100 is configured to have a right-handed chirality, and to have a lower transmittance under right-hand polarized light illumination than under left-hand polarized light illumination. The first chiral members 100 are arranged on the substrate 300 to form a pattern corresponding to the secret information, and the transmissivity of the first chiral members 100 is close to that of the substrate 300 under the irradiation of wide-spectrum natural light or linear polarized light, so that the encryption can be realized under the irradiation of the wide-spectrum natural light or linear polarized light, and the decryption can be realized under the irradiation of circular polarized light corresponding to the first chiral members 100.
As shown in fig. 1, 5 and 6, the chiral optical element further includes a second chiral member 200 having dichroism, and the handedness of the first chiral member 100 is opposite to that of the second chiral member 200. One of the first and second handedness elements 100 and 200 is configured as secret-related information, and the other is configured as a background, and under the irradiation of the left-handed light field LCP or the right-handed light field RCP, the transmittance of the first handedness element 100 and the transmittance of the second handedness element 200 are greatly different from each other, so that they are mutually mapped, and the definition of the secret-related information in a decrypted state can be improved.
As shown in fig. 1, 2, 3, 4 and 5, the first and second hand members 100 and 200 each include a convex portion having a square cross section. Wherein in the cross-section of the protruding part of the first chiral element 100 the square has sides parallel to the first direction of extension and in the cross-section of the protruding part of the second chiral element 200 the square has sides parallel to the second direction of extension. The included angle between the first extending direction and the reference direction X is 20-25 degrees, and the included angle between the second extending direction and the reference direction X is-25-20 degrees. The included angle between the first extending direction and the reference direction X can be set to be 21 degrees, 22 degrees, 22.5 degrees, 23 degrees or 24 degrees, and the included angle between the second extending direction and the reference direction X can be set to be-21 degrees, -22 degrees, -22.5 degrees, -23 degrees or-24 degrees.
In this embodiment, the cross-section of the protruding part of the first chiral element 100 has sides extending parallel to the first direction of extension, such that the first chiral element 100 has a left-handed chirality, and the cross-section of the second chiral element 200 has sides extending parallel to the second direction of extension, the chirality of the second chiral element 200 being opposite to the chirality of the first chiral element 100.
Through experimental tests, under the conditions that the included angle between the first extending direction and the reference direction X is 22.5 degrees and the included angle between the second extending direction and the reference direction X is-22.5 degrees, the chiral optical element can be respectively irradiated by the left-handed polarized light and the right-handed polarized light, and relatively clear secret-related information can be displayed, namely: under such conditions, the use of left-or right-polarized light can cause a large difference in transmittance at the secret information in the chiral optical element and transmittance at the background. Further, as shown in fig. 4, image a, image b, and fig. 5, image c and image d, the first chiral member 100 and the second chiral member 200 exhibit a large difference in transmittance, i.e., opposite chiral optical responses, at a wavelength of about 750 nm. During decryption, a left-handed light field LCP or a right-handed light field RCP with the wavelength range of 725 nm-775 nm is used, so that the secret-related information is displayed.
Furthermore, the side length of the square is 240 nm-280 nm; and/or the distance between any two adjacent squares is 430nm to 470nm along the reference direction X or the direction perpendicular to the reference direction X.
In one embodiment, the cross section of the bulge part is square, and the side length of the square is 245nm, 250nm, 260nm, 270nm or 280 nm. Through tests, under the conditions that the included angle between the first extending direction and the reference direction X is 22.5 degrees, the included angle between the second extending direction and the reference direction X is-22.5 degrees, and the wavelength of circularly polarized light is 750nm, the side length of the square is set to be 260nm, so that clear secret-related information can be displayed in a decryption state.
In another embodiment, the pitch between any two adjacent squares is 440nm, 450nm or 460nm in the reference direction X or the direction perpendicular to the reference direction X. It should be noted that two adjacent squares are defined as: in the direction along the reference direction X or perpendicular to the reference direction X, the two squares are flush and adjacent. The two square pitches are defined as: the distance between the intersection of one square diagonal and the intersection of another square diagonal adjacent thereto in the reference direction X or a direction perpendicular to the reference direction X. Through tests, under the conditions that the included angle between the first extending direction and the reference direction X is 22.5 degrees, the included angle between the second extending direction and the reference direction X is-22.5 degrees, and the wavelength of the circularly polarized light is 750nm, the space between any two adjacent squares is configured to be 450nm, so that clear secret-related information can be displayed in a decryption state.
In this embodiment, the side length of each square is 240nm to 280nm, and the distance between any two adjacent squares is 430nm to 470nm, so that clearer secret information can be displayed in a decrypted state.
Further, the chiral optical element further comprises a substrate 300, and the first chiral member 100 and the second chiral member 200 are respectively connected to the substrate 300. The substrate 300 may be made of glass, and the plurality of first chiral members 100 and the plurality of second chiral members 200 may be provided on the surface of the substrate 300, respectively, such that one of the first chiral members 100 and the second chiral members 200 constitutes secret information. Under the irradiation of wide-spectrum natural light or linearly polarized light, or under the irradiation of circularly polarized light less than 725nm or circularly polarized light more than 775nm, the secret-related information has the same transmittance as the background, so that the secret-related information is hidden; under the irradiation of 725 nm-775 nm left-handed polarized light or right-handed polarized light, the transmittance of the confidential information is different from that of the substrate, so that the confidential information is displayed, and the self-confidential state is switched to the decryption state.
As shown in fig. 1 and 3, the bump includes a first gold layer 001. The first gold layer 001 may be formed by an evaporation process.
Further, the thickness of the first gold layer 001 is 15nm to 25 nm. The thickness of the first gold layer 001 can be 16nm, 18nm, 20nm, 21nm, 23nm or 24nm, and in this embodiment, the thickness of the first gold layer 001 is configured to be 20 nm.
Further, a photoresist layer 003 is disposed between the first gold layer 001 and the substrate 300. The photoresist layer 003 is coated on the surface of the substrate 300, and the photoresist layer 003 can be processed to form a square with a cross-sectional shape corresponding to the protruding portion by electron beam exposure.
Further, a first chrome layer 002 is disposed between the photoresist layer 003 and the first gold layer 001. The first chromium layer 002 is deposited on the end surface of the photoresist layer 003 departing from the substrate 300, and during the deposition, the first chromium layer 002 can be deposited on the surface of the substrate 300. Subsequently, a first gold layer 001 is deposited on the surface of the first chromium layer 002, and the first chiral member 100 or the second chiral member 200 is formed by the photoresist layer 003, the first chromium layer 002, and the first gold layer 001.
Further, the thickness of the first chromium layer 002 is 0 nm-5 nm; and/or the thickness of the photoresist layer 003 is 50nm to 70 nm.
In one embodiment, the first chromium layer 002 may be 1nm, 2nm, 3nm or 4nm thick. In another embodiment, the thickness of the photoresist layer 003 is 55nm, 60nm or 65 nm.
In this embodiment, the thickness of the first chrome layer 002 is configured to be 3nm, and the thickness of the photoresist layer 003 is configured to be 60nm, so that the processing difficulty can be reduced, and the chiral optical element can have higher confidentiality in the confidential state and higher definition in the confidential information in the decrypted state.
Further, the first and second manual parts 100 and 200 each comprise: a second chromium layer 004 and a second gold layer 005; a second chromium layer 004 is coated on the surface of one side of the substrate 300 facing the convex part, and a second gold layer 005 is coated on the second chromium layer 004; and the second chrome layer 004 and the second gold layer 005 respectively enclose the photoresist layer 003. Under the irradiation of wide-spectrum natural light or linearly polarized light, or under the irradiation of circularly polarized light less than 725nm or circularly polarized light more than 775nm, the transmission intensity similar to that of the convex part is shown by the substrate 300, the second chromium layer 004 and the second gold layer 005.
As shown in fig. 3, the method for processing a chiral optical element according to an embodiment of the present invention includes: coating a photoresist layer 003 on the surface of the substrate 300; plating a chromium layer; and plating a gold layer.
Specifically, the substrate 300 is a glass substrate, and is spin-coated on the surface of the substrate 300 by using an electron beam resist, and is processed by an electron beam exposure to form the resist layer 003. And evaporating chromium layers on the surfaces of the substrate 300 and the photoresist layer 003 by an evaporation method to form a first chromium layer 002 and a second chromium layer 004, and evaporating gold layers on the surfaces of the first chromium layer 002 and the second chromium layer 004 by an evaporation method to form a first gold layer 001 and a second gold layer 005. The thicknesses of the first gold layer 001 and the second gold layer 005 are both 15nm to 25nm, the thicknesses of the first chromium layer 002 and the second chromium layer 004 are both 0nm to 5nm, and the thickness of the photoresist layer 003 is 50nm to 70nm, so that the chiral optical element provided by the first embodiment can be manufactured.
Example two
The optical encryption method provided by the embodiment of the invention comprises the following steps: marking the confidential information by adopting a chiral optical element with dichroism; in an encrypted state, the chiral optical element is irradiated by wide-spectrum natural light or linearly polarized light; in the decrypted state, the chiral optical element is illuminated with either left-handed polarized light or right-handed polarized light.
In one embodiment, the first chiral member 100 having dichroism is labeled as secret-related information; the first chiral member 100 and the substrate 300 have the same transmission intensity under the irradiation of the natural light or the linearly polarized light in the wide spectrum.
In another embodiment, one of first and second chiral elements 100 and 200 is labeled as confidential information; under the irradiation of wide-spectrum natural light or linearly polarized light, or under the irradiation of circularly polarized light less than 725nm or circularly polarized light more than 775nm, the secret-related information is hidden; and displaying the confidential information under the irradiation of the left-handed polarized light or the right-handed polarized light with the wavelength of 725nm to 775 nm.
The effect of the optical encryption method provided by the embodiment of the present invention is the same as the effect of the chiral optical element provided by the first embodiment, and therefore, the details are not repeated herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A chiral optical element, wherein the chiral optical element has circular dichroism, and the chiral optical element is configured to reveal secret-related information under the irradiation of left-handed polarized light or right-handed polarized light, and hide the secret-related information under the irradiation of wide-band natural light or linearly polarized light;
the chiral optical element comprises a first chiral component (100) having dichroism, and a second chiral component (200) having dichroism, the chirality of the first chiral component (100) being opposite to that of the second chiral component (200);
the first and second hand parts (100, 200) each comprise a boss of square cross-section;
-in the convex cross section of the first hand piece (100), the square has sides parallel to a first direction of extension; -in the convex cross-section of the second hand piece (200), the square has sides parallel to the second direction of extension;
the included angle between the first extending direction and the reference direction is 20-25 degrees, and the included angle between the second extending direction and the reference direction is-25-20 degrees;
the protruding part comprises a first gold layer (001), and a photoresist layer (003) is arranged between the first gold layer (001) and the substrate (300);
the chiral optical element further comprises a substrate (300), the protruding part is connected to the substrate (300), and the surface of the substrate (300) is provided with a second gold layer (005) which is made of the same material as the first gold layer (001);
a first chromium layer (002) is arranged between the photoresist layer (003) and the first gold layer (001);
the first and second manual parts (100, 200) each comprise: a second chromium layer (004) and a second gold layer (005);
the second chromium layer (004) is coated on one side surface of the base body (300) facing the convex part, and the second gold layer (005) is coated on the second chromium layer (004);
and the second chromium layer (004) and the second gold layer (005) are respectively surrounded with the photoresist layer (003).
2. An optical encryption method using the chiral optical element of claim 1, comprising:
marking the confidential information by adopting a chiral optical element with dichroism;
in an encrypted state, the chiral optical element is irradiated by wide-spectrum natural light or linearly polarized light;
in the decrypted state, the chiral optical element is illuminated with either left-handed polarized light or right-handed polarized light.
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| CN1989429A (en) * | 2004-07-21 | 2007-06-27 | 罗利克有限公司 | Anisotropic optical device and method for making same |
| CN106842376A (en) * | 2017-01-25 | 2017-06-13 | 南京大学 | A kind of three-dimensional metamaterial and its preparation method and application |
| CN109814195A (en) * | 2019-03-29 | 2019-05-28 | 武汉邮电科学研究院有限公司 | Multi-functional super surface texture, super surface element and encryption method based on polarization |
| CN110426758A (en) * | 2019-06-27 | 2019-11-08 | 武汉大学 | Optical film materials, construction method and its application based on super surface |
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| US20160341859A1 (en) * | 2015-05-22 | 2016-11-24 | Board Of Regents, The University Of Texas System | Tag with a non-metallic metasurface that converts incident light into elliptically or circularly polarized light regardless of polarization state of the incident light |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1989429A (en) * | 2004-07-21 | 2007-06-27 | 罗利克有限公司 | Anisotropic optical device and method for making same |
| CN106842376A (en) * | 2017-01-25 | 2017-06-13 | 南京大学 | A kind of three-dimensional metamaterial and its preparation method and application |
| CN109814195A (en) * | 2019-03-29 | 2019-05-28 | 武汉邮电科学研究院有限公司 | Multi-functional super surface texture, super surface element and encryption method based on polarization |
| CN110426758A (en) * | 2019-06-27 | 2019-11-08 | 武汉大学 | Optical film materials, construction method and its application based on super surface |
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