CN108549125B - Multifunctional optical filter and control method thereof - Google Patents
Multifunctional optical filter and control method thereof Download PDFInfo
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- CN108549125B CN108549125B CN201810405000.8A CN201810405000A CN108549125B CN 108549125 B CN108549125 B CN 108549125B CN 201810405000 A CN201810405000 A CN 201810405000A CN 108549125 B CN108549125 B CN 108549125B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 84
- 239000002184 metal Substances 0.000 claims abstract description 84
- 239000002052 molecular layer Substances 0.000 claims abstract description 47
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 239000011777 magnesium Substances 0.000 claims abstract description 31
- 239000001257 hydrogen Substances 0.000 claims abstract description 23
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 23
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 230000000737 periodic effect Effects 0.000 claims abstract description 9
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 4
- 229910012375 magnesium hydride Inorganic materials 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 12
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000005984 hydrogenation reaction Methods 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005839 oxidative dehydrogenation reaction Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 11
- 238000006356 dehydrogenation reaction Methods 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 8
- 238000000411 transmission spectrum Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002834 transmittance Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 229910052987 metal hydride Inorganic materials 0.000 description 2
- 150000004681 metal hydrides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
Abstract
The invention relates to an optical device, in particular to a multifunctional optical filter, which comprises a metal nano layer, a substrate layer and a planar structure connected between the metal nano layer and the substrate layer, wherein the planar structure is formed by connecting a plurality of nano periodic units with the same structure according to a rectangular periodic array plane, each nano periodic unit is formed by a rectangular metal block and a rectangular hole which are adjacent, the metal block is made of noble metal, and the metal nano layer is made of metal magnesium material. The optical filter can adjust the transmission characteristic by controlling the material state of the metal nano layer, and two functions of cutting off infrared light and transmitting infrared light are realized on the same optical filter. The filter has a simple structure, the transmission characteristic of the filter can be adjusted only by hydrogen absorption and dehydrogenation according to needs during later use, and the preparation and control method is simple and convenient. Provides a new idea for the design of the optical filter.
Description
Technical Field
The invention belongs to the technical field of optical devices, and particularly relates to a multifunctional optical filter and a control method thereof.
Background
The filter is made of plastic or glass plate and special dye, the red filter can only let red light pass through, the green filter can only let green light pass through, and so on. The transmittance of the glass sheet is almost the same as that of air originally, all colored light can pass through the glass sheet, so that the glass sheet is transparent, but after the glass sheet is dyed with dye, the molecular structure is changed, the refractive index is also changed, and the transmission path of some colored light is also changed. For example, a white light beam passes through a blue filter, and a blue light beam is emitted, while a little green light and a little red light are absorbed by the filter. The filter functions as a monochromator for filtering light of a certain wavelength range, but it cannot obtain monochromatic light.
The infrared cut filter is a filter applied to filter infrared bands. For example, devices such as incandescent lamps (e.g., slides, projectors) may be mounted to block unwanted heat from burning the lens, cameras mounted on solid state electronics (CCD or CMOS) may be mounted to prevent infrared radiation from passing through the camera lens, causing distortion of the picture, etc. The preparation of the infrared cut-off filter requires a complex process, the structure of the filter is determined after one-time preparation, the transmission characteristic is determined, and the change is difficult. Meanwhile, because infrared light has the penetrating ability (such as thin chemical fiber, smoke, water vapor and the like) to some materials and clothes relative to visible light, a miraculous perspective effect can be achieved, the infrared filter is widely applied to the fields of military affairs, public security, archaeology, medicine and the like, and the infrared filter is also frequently used for being matched with infrared photosensitive equipment to carry out infrared photography. The infrared cut-off filter and the infrared filter have quite opposite characteristic requirements, and two opposite functions of cutting off infrared light and transmitting infrared light cannot be realized on the same filter.
Disclosure of Invention
The invention provides a multifunctional optical filter and a control method thereof, aiming at solving the problem that two opposite functions of cutting off infrared light and transmitting infrared light cannot be realized on the same optical filter in the prior art. The optical filter can adjust the transmission characteristic by controlling the material property of the metal nano layer, and two functions of cutting off infrared light and transmitting infrared light are realized on the same optical filter. The filter has a simple structure, the transmission characteristic of the filter can be adjusted only by hydrogen absorption and dehydrogenation according to needs during later use, and the preparation and control method is simple and convenient.
The technical problem to be solved by the invention is realized by the following technical scheme:
a multifunctional optical filter comprises a metal nano layer, a substrate layer and a plane structure connected between the metal nano layer and the substrate layer;
the planar structure is formed by connecting a plurality of nano periodic units with the same structure according to a rectangular periodic array plane;
each nano-period unit consists of a rectangular metal block and a rectangular hole which are adjacent;
the metal block is made of noble metal; the metal nano layer is made of metal magnesium material.
Further, the rectangular metal block and the rectangular hole are the same in geometric size.
Further, the substrate layer is a glass substrate.
Further, the lengths and widths of the metal nanolayers, the substrate layer and the planar structure are all equal.
Further, the method for controlling the optical filter comprises the following steps:
the adjustment of the transmission characteristic of the optical filter can be realized through the conversion of the step 1 and the step 2.
Compared with the prior art, the invention has the beneficial effects that:
1. the optical filter can realize the regulation and control of the transmission characteristic of the optical filter by changing the material property of the metal nano layer, has simple operation and has strong popularization and application values.
2. When the metal nano layer of the optical filter is metal magnesium, the transmissivity of infrared light is close to 0, visible light can be penetrated, and light in an infrared wave band is cut off, so that the optical filter can be used for preparing optical devices such as a common infrared cut-off optical filter and the like; when the metal nano layer of the optical filter is converted into magnesium hydride, the infrared light transmittance is close to 1, and the infrared light can almost completely penetrate through the metal nano layer, so that the metal nano layer can be used for preparing optical devices such as an infrared filter and the like.
3. The metal nano layer of the optical filter can be realized only by carrying out dehydrogenation and hydrogen absorption reaction when the two states of magnesium and magnesium hydride are converted, the process is non-toxic and harmless, the operation is simple and convenient, and the optical filter has a certain design guidance effect on designing the optical filter in the future and provides a new research direction and thought for the design of other optical devices.
4. The metal nano layer of the optical filter uses a metal magnesium material, Mg is cheap and easily available, and MgH2Containing up to 7.6% by mass of hydrogen, and Mg is superior to all known reversible metal hydrides in the UV and blue visible bandsThe extinction effect can generate high-frequency plasmons, which are properties that other metals do not have.
Drawings
FIG. 1 is a front view of a filter structure according to the present invention;
FIG. 2 is a schematic diagram of the structure of each nano-periodic unit of the optical filter of the present invention;
FIG. 3 is a top view of a planar structure of an optical filter according to the present invention;
FIG. 4 is a transmission spectrum before and after conversion of the properties of the metal magnesium in the metal nanolayer of the optical filter of the present invention.
Wherein, in the figure: 1. a metallic nanolayer; 2. a planar structure; 21. a rectangular metal block; 22. a rectangular hole; 3. a base layer.
Detailed Description
The embodiment of the application provides a multifunctional optical filter and a control method thereof. The optical filter can adjust the transmission characteristic by controlling the material property of the metal nano layer, and two functions of cutting off infrared light and transmitting infrared light are realized on the same optical filter. The optical filter is simple in structure, the transmission characteristic of the optical filter can be adjusted only by hydrogen absorption and dehydrogenation according to needs during later use, and the preparation and control method is simple and convenient.
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, fig. 2 and fig. 3, the present embodiment provides a multifunctional optical filter, which includes a metal nano layer 1, a substrate layer 3 and a planar structure 2 connected between the metal nano layer 1 and the substrate layer 3, wherein the planar structure 2 is formed by connecting a plurality of nano periodic units with the same structure in a rectangular periodic array plane.
As shown in fig. 2, each nano-periodic unit is composed of a rectangular metal block 21 and a rectangular hole 22 which are adjacent to each other, the rectangular metal block 21 is made of noble metal, and the present embodiment is preferably made of gold material. The metal nano layer 1 is made of metal magnesium material. The rectangular metal block 21 and the rectangular hole 22 have the same geometric dimensions. The substrate layer 3 is preferably a glass substrate. The length and width of the metal nanolayer 1, the substrate layer 3 and the planar structure 2 are all equal.
The optical filter of the embodiment can realize the regulation and control of the transmission characteristic of the optical filter by changing the material property of the metal nano layer 1. When the metal nano layer 1 of the optical filter is metal magnesium, the transmittance of infrared light is close to 0, visible light can be transmitted, and light in an infrared band is cut off, so that the optical filter can be used for preparing optical devices such as a common infrared cut-off optical filter and the like; when the metal nano-layer 1 of the optical filter is converted into magnesium hydride, the infrared light transmittance is close to 1, and the infrared light can almost completely penetrate through the metal nano-layer, so that the metal nano-layer can be used for preparing optical devices such as an infrared filter and the like.
In addition, the metal nanolayer 1 of the optical filter of the embodiment is made of metal Mg, Mg is cheap and easily available, and MgH2Containing up to 7.6% by mass of hydrogen, over all known reversible metal hydrides, Mg has superior extinction efficiency in the ultraviolet and blue visible bands, can generate high-frequency plasmons, a property not possessed by other metals.
Example 2:
the optical filter in the embodiment has a simple structure, the preparation process is simple and rapid, the transmission characteristic of the optical filter can be adjusted only by hydrogen absorption and dehydrogenation according to needs when the optical filter is used at the later stage, and the preparation process and the adjustment method are simple and convenient and easy to operate.
Based on the optical filter structure of embodiment 1, this embodiment provides a method for controlling an optical filter, including the following steps:
through the conversion of the step 1 and the step 2, the adjustment of the transmission characteristic of the optical filter can be realized.
The preparation process of the optical filter is very strict, one structure can only realize specific transmission characteristics, two different transmission characteristics cannot be realized on the same structure, two diametrically opposite functions cannot be realized on the same lens, and the aim of the user can be achieved only by resetting and preparing the optical filter. Based on the optical filter disclosed in embodiment 1, in this embodiment, a control method of the optical filter is provided, in which the transmission characteristics of the structure are changed by changing the properties of the material of the metal nanolayer 1 of the optical filter through hydrogen absorption and dehydrogenation without being newly prepared, so as to achieve the purpose of adjusting the transmission characteristics.
At normal temperature, the filter is placed in a closed container containing hydrogen gas with a certain concentration, palladium is used as a catalyst, and the hydrogen gas concentration is preferably 0.25V% and 3.0V% in the embodiment, and nitrogen is used as a carrier gas. Palladium as a catalyst decomposes hydrogen molecules into hydrogen atoms, which hydrogenates with metallic Mg.
When the concentration of hydrogen gas is 0.25V%, the metal Mg gradually takes hydrogen absorption effect to form MgH with the time2The conversion from complete metallization to complete mesoification takes place and the entire hydrogenation process is completed for about 100 minutes. The structure was placed in a high concentration of hydrogen gas of 3.0V% volume fraction, and hydrogen uptake was almost instantaneous. We can adjust the conversion rate of metallic Mg and the conversion rate of magnesium as the material of the metallic nanolayer 1 by the hydrogen concentration.
Then at room temperature, exposing the hydrogenated filter in air to perform dehydrogenation oxidation, and gradually removing hydrogen from metal Mg to obtain MgH2Gradually converted into metal Mg, and reduced to an initial state, and the transmission characteristic and the electric field distribution of the structure are also restored to the previous state.
Therefore, the optical filter of the embodiment can realize the property adjustment of partial materials in the structure, and metal Mg is dehydrogenated through hydrogen absorption and goes from Mg (metal) to MgH2The conversion of the (medium) realizes the adjustment of the material property of the structural metal nano layer 1 to realize the adjustment of the infrared light transmission intensity, the operation is simple and convenient, and a new thought is provided for the design of the optical filter.
The metal nano layer 1 of the optical filter can be realized only by carrying out dehydrogenation and hydrogen absorption reaction when the two states of magnesium and magnesium hydride are converted, the process is non-toxic and harmless, the operation is simple and convenient, and the method not only has a certain design guidance effect on designing the optical filter in the future, but also provides a new research direction and thought for the design of other optical devices and has a certain guidance significance.
Example 3:
in the embodiment, after the hydrogen absorption and dehydrogenation reactions are respectively completed, the transmission intensity is tested in the wave band of 300-2000 nm, the wavelength ranges of infrared light and visible light are included, and the hydrogen absorption and dehydrogenation reaction device can be used in actual life.
Based on the filter structures described in examples 1 and 2, computational simulation experiments were performed by using three-dimensional Finite Element Method (FEM) computation software COMSOL Multiphysics. The specific setting parameters are as follows:
the thickness of the metal nano layer 1 is 10 nm; the thickness of the substrate layer 3 is 50 nm; the thickness of the planar structure 2 is 20 nm; in each nano-periodic unit: size of rectangular metal block 21: length 20nm, width 20nm and thickness 20 nm; size of rectangular hole 22: 20nm in length, 20nm in width and 20nm in thickness.
FIG. 4 shows the transmission spectra before and after the conversion of the properties of the filter metal nanolayer 1 of this example. From the figure we can clearly derive:
when the metal nano layer 1 is magnesium metal, the transmission spectrum is continuously reduced along with the increase of the wavelength, the transmission is almost zero after 800nm, namely, the visible light can be transmitted, and the light in the infrared band is filtered, so that the function of intercepting the infrared light can be realized.
When the metal mass is completely mesoporous (MgH)2) In the transmission spectrum, the transmission is increased along with the increase of the wavelength, and the transmission is gradually close to 1 after about 800nm, namely infrared light can penetrate through the transmission spectrum, so that the function of penetrating through the infrared light is realized.
Therefore, in the structure of embodiment 1, in the optical filter of this embodiment, the optical filter in this embodiment can realize conversion of the material property of the metal nano layer 1 through conversion of metal magnesium and magnesium hydride, can realize adjustment of the infrared light transmission characteristic, and can realize two diametrically opposite functions of cutting off infrared light and transmitting infrared light on the same structure. And the transmission intensity and the change trend of the transmission intensity of the metal nano layer 1 before and after the conversion of the metal magnesium are changed, the functions of expanding the transmission spectrum range and the like are realized, the operation is simple and convenient, the result not only has a certain design guidance function for designing the optical filter in the future, but also provides a new research direction and thought for the design of other optical devices.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. A multifunctional optical filter comprises a metal nano layer, a substrate layer and a plane structure connected between the metal nano layer and the substrate layer; the method is characterized in that:
the planar structure is formed by connecting a plurality of nano periodic units with the same structure according to a rectangular periodic array plane;
each nano-period unit consists of a rectangular metal block and a rectangular hole which are adjacent; the rectangular metal block and the rectangular hole have the same geometric dimension;
the metal block is made of noble metal; the metal nano layer is made of a metal magnesium material;
the lengths and widths of the metal nanolayer, the base layer and the planar structure are all equal.
2. A filter according to claim 1, wherein: the substrate layer is a glass substrate.
3. A method of controlling an optical filter according to any one of claims 1-2, characterized in that: the method comprises the following steps:
step 1, at room temperature, placing the optical filter in a closed device filled with hydrogen, adding palladium catalyst, standing for more than 30min, and carrying out hydrogenation reaction on metal magnesium of the metal nano layer and the hydrogen to generate magnesium hydride, namely the magnesium hydride is equal to a medium, so that the structure of the optical filter is changed, and the transmission characteristic of the optical filter is changed;
step 2, at room temperature, placing the hydrogenated optical filter in an oxygen environment, wherein magnesium hydride is subjected to oxidative dehydrogenation reaction, the magnesium hydride of the metal nano layer is reduced to metal magnesium, and the transmission characteristic of the optical filter is reduced to the initial value;
the adjustment of the transmission characteristic of the optical filter can be realized through the conversion of the step 1 and the step 2.
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| CN201810405000.8A CN108549125B (en) | 2018-04-28 | 2018-04-28 | Multifunctional optical filter and control method thereof |
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| CN201810405000.8A CN108549125B (en) | 2018-04-28 | 2018-04-28 | Multifunctional optical filter and control method thereof |
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| CN108549125A CN108549125A (en) | 2018-09-18 |
| CN108549125B true CN108549125B (en) | 2021-08-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109901253B (en) * | 2019-03-22 | 2020-06-09 | 江南大学 | Surface plasma filter |
| CN110007538B (en) * | 2019-04-24 | 2022-01-18 | 中国地质大学（武汉） | Overheat protection electroluminescent surface plasmon light source |
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| CN1831517A (en) * | 2005-09-27 | 2006-09-13 | 重庆大学 | Miniature portable infrared spectrograph |
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| CN103760630A (en) * | 2014-02-21 | 2014-04-30 | 哈尔滨工业大学 | Infrared double-waveband mosaic array optical filter of sub-wavelength grating structure |
| CN107515436A (en) * | 2017-09-29 | 2017-12-26 | 苏州大学 | A kind of visible ray broadband absorption structure and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2965067B1 (en) * | 2010-09-17 | 2013-07-19 | Onera (Off Nat Aerospatiale) | SPECTRAL FILTER PASSE BAND WITH HIGH SELECTIVITY AND CONTROLLED POLARIZATION |
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