CN109613635B - Novel ultra-narrow band wave absorber with metal nano ring column array structure - Google Patents
Novel ultra-narrow band wave absorber with metal nano ring column array structure Download PDFInfo
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- CN109613635B CN109613635B CN201910035610.8A CN201910035610A CN109613635B CN 109613635 B CN109613635 B CN 109613635B CN 201910035610 A CN201910035610 A CN 201910035610A CN 109613635 B CN109613635 B CN 109613635B
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 title claims abstract description 55
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 55
- 239000002063 nanoring Substances 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 15
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010931 gold Substances 0.000 claims abstract description 9
- 229910052737 gold Inorganic materials 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 15
- 238000000862 absorption spectrum Methods 0.000 abstract description 5
- 239000010408 film Substances 0.000 abstract 1
- 229910000510 noble metal Inorganic materials 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
- 239000002086 nanomaterial Substances 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 7
- 230000005284 excitation Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a novel ultra-narrow band absorber of a metal nano ring column array structure, which solves the technical problem of poor quality factor, and the ultra-narrow band absorber based on surface lattice resonance is composed of a nano ring column array; the nano array unit is sequentially arranged into a dielectric layer substrate, a metal film reflecting layer and a resonator from bottom to top; the thickness of the thin film gold of the reflecting layer of the nano array unit is larger than the skin depth of the incident electromagnetic wave in noble metal gold; the nano array unit adopts a double-ring column structure to compress the full width half maximum of the absorption spectrum of the wave absorber, so that the problems of low absorption efficiency, large full width half maximum, low quality factor and the like of the traditional wave absorber are well solved, and the nano array unit can be used in the application of a narrow-band heat radiator and a plasma biosensor.
Description
Technical Field
The invention relates to the field of ultra-narrow band wave absorbers, in particular to a novel ultra-narrow band wave absorber with a metal nano ring column array structure.
Background
In recent years, narrowband absorbers based on surface lattice resonance have been attracting attention in many fields. The ultra-narrow band absorber with nanometer scale has the characteristics of small volume, high sensitivity, wide market application prospect, easy mass production and the like, and is more and more paid attention to. The conventional structure of the traditional narrow-band absorber is a metal-medium-metal structure, but the generated surface lattice resonance effect is less obvious, the quality factor of the absorber is obviously reduced, and the application of the narrow-band absorber is limited.
In order to solve the technical problem of small quality factor of the existing ultra-narrow band absorber, the invention provides an ultra-narrow band absorber based on surface lattice resonance of a nano-structure metal surface, which can generate strong surface lattice resonance effect and ultra-high optical interaction at resonance absorption wavelength to obtain a higher quality factor. The ultra-narrow band wave absorber based on surface lattice resonance has a great application and development prospect in the aspects of a narrow band heat radiator, a high-sensitivity biosensor and the like.
Disclosure of Invention
The invention provides a novel ultra-narrow band absorber based on a metal nano ring column array structure, which has the characteristic of higher quality factor.
In order to improve the quality factor of the narrow-band absorber, the following technical scheme is adopted:
the novel ultra-narrow band wave absorber of the metal nano ring column array structure comprises nano structure units which are periodically arranged; the nanostructure unit is sequentially provided with a medium substrate, a bottom continuous metal film and a resonator from bottom to top; the thickness of the bottom continuous metal film is larger than the skin depth of the incident wave on the bottom continuous metal film layer;
the resonator comprises two concentric metal nano ring columns; the first concentric metal nano ring column is positioned below the second concentric metal nano ring column, the inner diameters of the two nano ring columns are equal, the outer diameter of the first nano ring column is larger than that of the second nano ring column, and the heights of the first nano ring column and the second nano ring column are equal; the first nano ring column and the second nano ring column are connected in a seamless manner;
the vertical cross sections of the medium substrate and the bottom continuous metal film are rectangular; the horizontal cross sections of the dielectric substrate and the bottom continuous metal film are square and have the same size.
The working principle of the invention is as follows: because the wave absorbing component of the designed ultra-narrow band wave absorber is composed of the same metal, the periodic nano structure can generate stronger surface lattice resonance, and meanwhile, stronger optical coupling effect is generated between the resonator and the gold film, so that the device can obtain higher quality factor. Surface lattice resonances are essentially complex localized surface plasmon resonances that have not only periodic effects on the diffraction orders of the periodic array, but are also affected by the plasmonic nature of the metal structure. Whereas for our designed structure the resonant wavelength increases linearly with period. The narrowband absorber structure has a smaller periodicity due to the stronger coupling effect and stronger surface lattice resonance effect of each structural unit. Also, we can reduce the coupling between the structural units by increasing the size of the period and thus the resonance bandwidth.
The nanostructure is made of gold and the highly reflective underlayer below the designed nanostructure provides strong optical interactions and scatters light back into the air rather than down into the dielectric, compared to conventional metal-dielectric-metal structures. By eliminating this forward scattering, the radiation loss is significantly reduced, contributing to a narrower absorption band. The all-metal absorber drives electromagnetic field resonance from the substrate interface to the top surface of the nanostructure. The excitation mode from the top surface may be more than three times higher in local field strength than the metal-dielectric-metal structure. In general, highly excited surface lattice resonances excited by the underlying metal substrate can provide a sharper absorption spectrum and a higher quality factor.
In the above scheme, for optimization, further, the material of the bottom continuous metal film is gold.
Further, the length and the width of the bottom continuous metal film are p=1000 nm, and the thickness h=200 nm; the inner diameter d1=100 nm, the outer diameter d3=300 nm and the height h2=40 nm of the first metal nano ring column; the inner diameter d1=100 nm, the outer diameter d2=210 nm and the height h1=40 nm of the second metal nano ring column.
Further, the working wavelength range of the novel ultra-narrow band absorber is 700-1800nm.
The invention has the beneficial effects that: the nanometer ultra-narrow band absorber is of a periodic structure, is simple in structure, compact in structure, perfectly symmetrical and easy to realize; the invention provides a nanometer ultra-narrow band absorber, and the resonance wavelength modulation range is 900nm to 1500nm. The absorption of resonance wavelengths in the period from 600nm to 1000nm exceeds 70%, the quality factor is as high as 80, and the refractive index sensitivity is as high as 1020nm/RIU, particularly, it should be pointed out that the previously reported narrow-band absorbers have difficulty in achieving such high quality factors.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a three-dimensional schematic diagram of the wave absorber array unit.
Fig. 2 shows the absorption rate of the absorber according to example 1 as a function of wavelength and period in air.
Fig. 3 shows the trend of the light absorptivity of the absorber described in example 1 with wavelength and period.
Fig. 4, application of the absorber described in example 1 in the sensor field.
Fig. 5 shows that the refractive index sensitivity of the absorber described in example 1 as a micro-nano sensor increases with the period of the structure.
FIG. 6 shows a wavelength absorber of the embodiment 1 as a micro-nano photothermal radiometer with a period of 1000nm, an ambient refractive index of 1 (air environment), an ambient temperature of 300K, an excitation wavelength of resonance wavelength, and an incident light intensity of 100mW/cm 2 From the temperature profile obtained by the simulation, the device temperature increased by 5.6K at thermal steady state.
FIG. 7 shows a wavelength absorber of the embodiment 1 as a micro-nano photothermal radiometer, the period being 1000nm, the ambient refractive index being 1 (air environment), the ambient temperature being 300K, the excitation wavelength being the resonance wavelength, the incident light intensity being 100mW/cm 2 The relationship between the input light intensity and the temperature increase of the absorber at thermal steady state.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be noted that the specific embodiments described herein are for the purpose of illustrating the invention only and are not to be construed as limiting the invention.
Example 1
The embodiment provides a novel ultra-narrow band absorber of a metal nano ring column array structure, which consists of a periodic metal nano ring column structure; the nano ring column array structure sequentially comprises a medium substrate, a bottom continuous metal film layer and a resonator from bottom to top; the nano ring column is of a double-ring column structure with the same wall thickness of the ring column; the thickness of the bottom continuous metal film layer is larger than the skin depth of incident waves in the same material metal of the bottom continuous metal film layer.
As shown in fig. 1, the bottom of the nano ring column array structure is a cuboid made of gold material, a first nano ring column is arranged on the cuboid, the first nano ring column is positioned below a second nano ring column, the inner diameters of the two nano ring columns are equal, and the first nano ring column and the second nano ring column are directly overlapped; the first nano ring column and the second nano ring column are made of gold. The length and width p=1000 nm of the bottom metal and the thickness h=200 nm; the inner diameter d1=100 nm, the outer diameter d3=300 nm and the height h2=40 nm of the first nano ring column; the second nanoring column has an inner diameter d1=100 nm, an outer diameter d2=210 nm, and a height h1=40 nm.
Simulation calculations were performed using FDTD solutions software, as in fig. 2. It can be seen that in the wavelength range 700nm-1800nm the resonance frequency gradually red shifts from 900nm to 1500nm. When the background refractive index is 1 and the period is 600nm-1000nm, the absorption peak value is over 70%. The refractive index sensitivity increases gradually from 675nm/RIU to 1020nm/RIU as the period changes from 600nm to 1100 nm. This demonstrates that the metamaterial-structured ultra-narrow-band absorber designed in this embodiment has significant advantages both in terms of structure and index parameters.
As shown in fig. 1, the ultra-narrow band absorber of the present embodiment is simple and compact in structure. The dielectric substrate of this embodiment may be a conventional silicon dioxide substrate material, or may be another dielectric material, which does not act on the surface lattice resonance of the device as a substrate. The optimized ultra-narrow band absorber bottom continuous metal film layer and the nano ring column are all made of gold, and the material is single and easy to realize.
As shown in fig. 2, the absorption spectra of the ultra-narrow band absorber of the present embodiment under different periodic conditions are given. Simulation shows that the period of the nano array is in the range of 600nm to 1000nm, and the highest peak absorption of the absorber is more than 70%. And as the period increases, the resonance absorption wavelength undergoes a red shift phenomenon.
As shown in fig. 3, the trend of the change in light absorption efficiency with wavelength and period of the ultra-narrow band absorber of the present embodiment is given. The wavelength range is 700nm-1700nm, when the period change range is 600 nm-800 nm, the absorption spectrum has only one peak absorption, but the full width at half maximum of the peak is too large, so that the quality factor is reduced; when the period variation ranges between 800nm and 1200nm, the absorption spectrum exhibits two absorption peaks. The absorption peak corresponding to longer wavelength has high absorption rate and narrow half-width. The absorption peak mentioned in this patent refers to an absorption peak corresponding to a longer wavelength unless otherwise specified.
As shown in fig. 4, the application of the ultra-narrow band absorber of the present embodiment in the field of refractive index sensing is illustrated. The period of the ultra-narrow band absorber is set to be 1000nm, the refractive index of the analysis liquid is increased from 1.30 to 1.50, the resonance absorption peak value of the analysis liquid is also more than 90%, and the resonance wavelength is linearly increased along with the increase of the refractive index; at refractive indices of the analytes of 1.30 and 1.50, the resonance wavelengths were 1350nm and 1550nm, respectively.
As shown in fig. 5, the effect of the period of the ultra-narrow band absorber of the present embodiment on the refractive index sensitivity is demonstrated. It can be seen that the refractive index sensitivity increases gradually from 675nm/RIU to 1020nm/RIU as the period changes from 600nm to 1100 nm. From this, it is understood that the refractive index sensing sensitivity of the ultra-narrow band absorber of the present embodiment can be adjusted by the period.
As shown in fig. 6, the application of the ultra-narrow band absorber of the present embodiment in the field of heat radiators is illustrated. The period is 1000nm, the ambient refractive index is 1 (air environment), the ambient temperature is 300K, the excitation wavelength is the resonance wavelength, and the incident light intensity is 100W/cm 2 From the temperature profile obtained by the simulation, the device temperature increased by 5.6K at thermal steady state. Simulation results show that the ultra-narrow band absorber has remarkable photo-thermal conversion efficiency and can be used as a micro-nano heat radiator.
As shown in fig. 7, the absorber described in example 1 shows the relationship between the increase in the photothermal conversion temperature of the ultra-narrow band absorber and the intensity of incident light in this example as a micro-nano photothermal radiometer. The period is 1000nm, the ambient refractive index is 1 (air environment), the ambient temperature is 300K, the excitation wavelength is the resonance wavelength, and the incident light intensity is 100W/cm 2 It can be seen that at thermal steady state conditions, the temperature of the absorber increases linearly with increasing light intensity.
In this embodiment, the skin depth of the incident wave in the underlying continuous metal film does not exceed 100nm over the frequency range under consideration. Therefore, the bottom continuous metal film is set to 200nm to effectively prevent electromagnetic waves from transmitting through the absorber.
The working wavelength range of the novel ultra-narrow band absorber in the embodiment is 700nm-1800nm.
While the foregoing describes the illustrative embodiments of the present invention so that those skilled in the art may understand the present invention, the present invention is not limited to the specific embodiments, and all inventive innovations utilizing the inventive concepts are herein within the scope of the present invention as defined and defined by the appended claims, as long as the various changes are within the spirit and scope of the present invention.
Claims (2)
1. A novel ultra-narrow band wave absorber of a metal nano ring column array structure is characterized in that: the novel ultra-narrow band wave absorber of the metal nano ring column array structure consists of a periodic metal nano ring column structure; the nano ring column array structure sequentially comprises a medium substrate, a bottom continuous metal film layer and a resonator from bottom to top; the thickness of the bottom continuous metal film layer is larger than the skin depth of incident waves in the metal of the same material as the bottom continuous metal film layer;
the resonator comprises two concentric metal nano ring columns; the first concentric metal nano ring column is positioned below the second concentric metal nano ring column, the inner diameters of the two ring columns are equal, the outer diameter of the first nano ring column is larger than that of the second nano ring column, and the heights of the two ring columns are equal; the first nano ring column and the second nano ring column are directly overlapped without an intermediate medium layer;
the vertical cross sections of the medium substrate and the bottom continuous metal film are rectangular; the horizontal cross sections of the dielectric substrate and the bottom continuous metal film are square and have the same size;
the bottom continuous metal film is made of gold;
the length and the width of the bottom continuous metal film are p=1000 nm, and the height h=200 nm;
the inner diameter d1=100 nm, the outer diameter d3=300 nm and the height h2=40 nm of the first concentric metal nano ring column;
the inner diameter d1=100 nm, the outer diameter d2=210 nm and the height h1=40 nm of the second concentric metal nano ring column;
the dielectric substrate includes a silicon dioxide substrate material.
2. The novel ultra-narrow band absorber of the metal nano ring pillar array structure according to claim 1, wherein: the working wavelength range of the novel ultra-narrow band absorber of the metal nano ring column array structure is 700nm-1800nm.
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| CN111580197B (en) * | 2020-05-17 | 2022-05-17 | 桂林电子科技大学 | Transverse MIMI lattice plasmon resonance absorber |
| CN112114391B (en) * | 2020-10-21 | 2021-12-28 | 电子科技大学 | Plasmon absorber and preparation method thereof |
| CN112558200B (en) * | 2020-12-04 | 2023-04-07 | 中国人民解放军国防科技大学 | Metamaterial wave absorber and manufacturing method thereof |
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| CN113387318B (en) * | 2021-06-11 | 2024-02-09 | 中国科学技术大学 | Near-infrared band-pass filter based on nano annular array and preparation method thereof |
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