CN214313547U - Tunable narrow-band wave absorber based on light-operated metamaterial - Google Patents
Tunable narrow-band wave absorber based on light-operated metamaterial Download PDFInfo
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- CN214313547U CN214313547U CN202023041683.5U CN202023041683U CN214313547U CN 214313547 U CN214313547 U CN 214313547U CN 202023041683 U CN202023041683 U CN 202023041683U CN 214313547 U CN214313547 U CN 214313547U
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Abstract
The utility model discloses a tunable narrow-band wave absorber based on light-operated metamaterial, which comprises a bottom reflecting plate, wherein a dielectric substrate is arranged on the bottom reflecting plate, and a periodic structural unit is arranged on the dielectric substrate; the periodic structure unit comprises a high-resistance surface ring located in the center of the medium substrate, an opening resonance ring is arranged on the periphery of the high-resistance surface ring, the outer side of the opening resonance ring is connected with resonance units which are symmetrically distributed around the opening resonance ring, photosensitive resistance silicon is symmetrically arranged at corners of the medium substrate, and the photosensitive resistance silicon is connected with the resonance units and encloses a closed area. The tunable frequency and bandwidth absorption of the wave absorber in the THz wave band can be realized by coating a high-resistance surface on the resonance unit on the dielectric substrate and adding the photoresistor; the terahertz wave absorption device can absorb terahertz electromagnetic waves under a smaller physical size, and has the characteristics of flexible design, tunable light control, wide application range and strong functionality.
Description
Technical Field
The utility model relates to a tunable narrowband terahertz wave absorber especially relates to a tunable narrowband wave absorber based on light-operated metamaterial.
Background
The terahertz wave generally refers to an electromagnetic wave with the frequency of 0.1-10 THz, the corresponding wavelength range is 3-0.03 mm, and the terahertz wave has wide application prospects in numerous fields such as spectrum analysis, detection sensing, biomedicine, security inspection imaging and the like. The sandwich-shaped structure of the sub-wavelength metal micro-structure array layer, the dielectric layer and the metal layer is a typical structure of a metamaterial wave absorber, and can realize perfect absorption of incident electromagnetic waves by inhibiting transmission and reflection channels and utilizing the ohmic loss of the sub-wavelength metal array layer structure and the metal layer and medium absorption. However, the wave absorbing device adopts conventional metal and medium materials, and the wave absorbing frequency of the metamaterial wave absorbing device can be adjusted only by changing the size of a geometric structure under a common condition, and once the device is prepared and the structure size is determined, the absorption characteristic of the metamaterial wave absorbing device has no adjustability. Therefore, in order to adjust the terahertz absorption frequency without changing the geometric structure, a research work for a novel wave absorber with an electromagnetic parameter adjustable material is deeply developed, and the method becomes an important research direction in the field of terahertz wave absorbers.
At present, many researchers have proposed various types of metamaterial wave absorbers with various shapes, and a common metamaterial wave absorber with single-waveband absorption has a simple structure and only has a certain absorption effect in a certain single waveband.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a tunable narrowband wave absorber based on light-operated metamaterial through the resonance unit coating high resistance surface on the medium base plate and add the photo resistance, can realize that wave absorber absorbs at the tunable frequency and the bandwidth of THz wave band.
The utility model discloses a realize above-mentioned utility model purpose and adopt following technical scheme:
the utility model provides a tunable narrow-band wave absorber based on light-operated metamaterial, which comprises a bottom reflecting plate, wherein a dielectric substrate is arranged on the bottom reflecting plate, and a periodic structural unit is arranged on the dielectric substrate;
the periodic structure unit comprises a high-resistance surface ring located in the center of the medium substrate, an opening resonance ring is arranged on the periphery of the high-resistance surface ring, the outer side of the opening resonance ring is connected with resonance units which are symmetrically distributed around the opening resonance ring, photosensitive resistance silicon is symmetrically arranged at corners of the medium substrate, and the photosensitive resistance silicon is connected with the resonance units and encloses a closed area.
Further, the periphery of the split resonant ring is provided with split rings with high resistance surfaces, and the split rings with high resistance surfaces and the split of the split resonant ring are arranged in a staggered manner.
Further, the opening length of the split ring with the high-resistance surface is 15 μm.
Furthermore, the dielectric substrate is provided with air columns which are periodically arranged, and the periodic structure unit is arranged on the air columns.
Furthermore, the air column is in a cube shape, and the side length is 25 mu.
Further, the opening length of the open resonant ring is 10 μm.
Further, the photoresistor silicon has a length of 23.1 μm and a thickness of 4 μm.
Furthermore, the bottom layer reflecting plate is in a cube shape, the side length is 160 micrometers, and the thickness is 0.25 micrometers.
Further, the shape of the resonance unit is convex.
Furthermore, the opening resonance ring and the resonance unit connected with the opening resonance ring are made of gold materials.
The utility model has the advantages that:
the tunable frequency and bandwidth absorption of the wave absorber in the THz wave band can be realized by coating a high-resistance surface on the resonance unit on the dielectric substrate and adding the photoresistor;
the terahertz wave absorption device can absorb terahertz electromagnetic waves under a smaller physical size, and has the characteristics of flexible design, tunable light control, wide application range and strong functionality.
Drawings
Fig. 1 is a front view of a tunable narrow-band wave absorber based on a light-operated metamaterial according to an embodiment of the present invention;
fig. 2 is a top view of a tunable narrow-band wave absorber based on a light-operated metamaterial according to an embodiment of the present invention;
fig. 3 is a side view of a tunable narrow-band wave absorber based on a light-operated metamaterial according to an embodiment of the present invention;
fig. 4 is a top view array (3 × 3) diagram of a tunable narrow-band wave absorber based on a light-controlled metamaterial according to an embodiment of the present invention;
fig. 5 is an absorption curve of the photoresistor with a conductivity of 1S/m when TE-mode electromagnetic waves are vertically incident on the tunable narrow-band wave absorber based on the light-controlled metamaterial according to an embodiment of the present invention;
fig. 6 is an absorption curve of the photoresistor with the conductivity of 1e 6S/m when TE-mode electromagnetic waves are vertically incident on the tunable narrow-band wave absorber based on the light-controlled metamaterial according to the embodiment of the present invention;
fig. 7 is an absorption curve of different conductivities when TE-mode electromagnetic waves are vertically incident on a tunable narrow-band wave absorber based on a light-operated metamaterial according to an embodiment of the present invention.
Detailed Description
The technical scheme of the utility model is further explained in detail with the attached drawings as follows:
the embodiment provides a tunable narrow-band wave absorber based on a light-operated metamaterial, which has a structure shown in fig. 1, fig. 2 and fig. 3, and comprises a bottom-layer reflecting plate 1, wherein a dielectric substrate 2 is arranged on the bottom-layer reflecting plate 1, the dielectric substrate 2 is polyimide (loss tangent is 0.0027), a high-resistance surface ring 8 in the center of the substrate, an open resonant ring 6, a convex resonant unit 7 connected with the open resonant ring 6, and photoresistance silicon 3 uniformly and symmetrically distributed along four corners of the dielectric substrate 1 are arranged on the dielectric substrate 2, the dielectric constant of the photoresistance silicon 3 is 11.7, the open resonant ring 6 and the resonant unit 7 connected with the open resonant ring 6 are both made of gold materials, the conductivity of the gold is 45610000S/m, and the specific structure is shown in fig. 1.
The tunable narrow-band wave absorber based on the light-operated metamaterial is formed by periodically arranging a plurality of resonance units 7. The bottom layer of the structural unit is a complete metal reflecting plate used for total reflection, a medium substrate is arranged above the metal reflecting plate, and square air columns 5 which are periodically arranged are arranged on the medium substrate. The array of structural units (3 × 3) is shown in fig. 4.
According to the tunable narrow-band wave absorber based on the light-operated metamaterial, the bottom reflecting plate 1 is a metal reflecting plate made of gold.
The tunable narrow-band wave absorber based on the light-operated metamaterial can achieve tunable wave absorbing performance in the THz wave band.
Four corners of the wave absorber structural unit are formed by photoresistor silicon 3, the length of the photoresistor structural unit is 23.1 mu m, four convex resonance units 7 connected with the photoresistor structural unit are made of gold, the inside of each convex resonance unit is connected with an opening resonance ring 6 made of gold, the radius of each opening resonance ring is 38.75 mu m, and the opening length of each opening resonance ring is 10 mu m. The outside of the device is provided with a high resistance surface split ring 4 with the radius of 47.5 mu m, and the length of the split ring is 15 mu m. The interior of the resonance ring is provided with a circular ring structure formed by high-resistance surfaces, and the corresponding radius is 22.5 mu m.
The relevant parameters are shown in table 1.
TABLE 1
| Parameter(s) | a1 | a2 | d1 | d2 | d3 | d4 |
| Numerical value (μm) | 131.25 | 25 | 4 | 25 | 5 | 12 |
| Parameter(s) | d5 | p | r1 | r2 | r3 | t1 |
| Numerical value (μm) | 10 | 160 | 47.5 | 38.75 | 22.5 | 0.25 |
| Parameter(s) | t2 | t3 | y | w1 | w2 | w3 |
| Numerical value (μm) | 7.6 | 0.2 | 23.1 | 10 | 15 | 5 |
Fig. 5 and fig. 6 are respectively a tunable narrow-band wave absorber of the light-operated metamaterial, and absorption curves of TE and TM waves are respectively obtained when the conductivity q of the photoresistor silicon on the surface of the dielectric substrate is 1S/m. As can be seen from fig. 5, the absorption rate of the absorber is above 90% in the frequency domain 1.42-1.52THz, and at the frequency point 1.446THz, the absorption rate reaches 98.21%, perfect absorption is almost achieved, the absorption curves of the TE wave and the TM wave almost perfectly coincide, and as can be seen from fig. 6, the absorption frequency domain of the TM wave is 1.42-1.52THz (the absorption rate is greater than 90%). The absorber is polarization insensitive.
Fig. 7 is an absorption curve for different conductivities at TE waves. As can be seen from FIG. 7, when the conductivity q is changed from 1S/m to 1e 6S/m, the absorption peak of the absorber is continuously shifted to the low frequency band, and the narrow-band absorption of the high frequency band is gradually changed to the single-frequency-point absorption of the low frequency band. When q <5e 3S/m, the absorber is narrow-band absorption in the high-band. When q is more than 5e5S/m, the absorber is single-frequency point absorption of low frequency band and absorption bandwidth of 90% above absorption rate is gradually reduced, and the absorption rate of the single-frequency point is up to 97.3% at about 1.13 THz.
The above description specifically describes the preferred embodiment of the present invention, but of course, the present invention can also adopt different forms from the above embodiments, and equivalent changes or corresponding modifications made by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.
Claims (10)
1. A tunable narrow-band wave absorber based on a light-operated metamaterial is characterized by comprising a bottom-layer reflecting plate, wherein a dielectric substrate is arranged on the bottom-layer reflecting plate, and periodic structural units are arranged on the dielectric substrate;
the periodic structure unit comprises a high-resistance surface ring located in the center of the medium substrate, an opening resonance ring is arranged on the periphery of the high-resistance surface ring, the outer side of the opening resonance ring is connected with resonance units which are symmetrically distributed around the opening resonance ring, photosensitive resistance silicon is symmetrically arranged at corners of the medium substrate, and the photosensitive resistance silicon is connected with the resonance units and encloses a closed area.
2. The tunable narrow-band wave absorber based on the light-operated metamaterial according to claim 1, wherein open rings with high-resistance surfaces are arranged on the periphery of the split resonator rings, and the open rings with high-resistance surfaces are staggered with the split of the split resonator rings.
3. The tunable narrow-band wave absorber based on the light-operated metamaterial according to claim 2, wherein the length of the opening of the open ring with the high-resistance surface is 15 μm.
4. The tunable narrow-band wave absorber based on the light-operated metamaterial according to claim 1, wherein air columns are periodically arranged on the dielectric substrate, and the periodic structure unit is arranged on the air columns.
5. The tunable narrow-band wave absorber based on the optically controlled metamaterial according to claim 4, wherein the air column is square in shape and 25 μm in side length.
6. The tunable narrow-band optical control metamaterial-based filter as claimed in claim 1, wherein the open resonator ring has an opening length of 10 μm.
7. The tunable narrow-band light-operated metamaterial-based filter as claimed in claim 1, wherein the photoresistor silicon has a length of 23.1 μm and a thickness of 4 μm.
8. The tunable narrow-band wave absorber based on the optically controlled metamaterial according to claim 1, wherein the bottom reflecting plate is square in shape, 160 μm in side length and 0.25 μm in thickness.
9. The tunable narrow-band wave absorber based on the optically controlled metamaterial according to claim 1, wherein the resonant unit is convex in shape.
10. The tunable narrow-band wave absorber based on the optically controlled metamaterial according to claim 1, wherein the split resonant ring and the resonant unit connected with the split resonant ring are made of gold materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114967124A (en) * | 2022-06-08 | 2022-08-30 | 南京邮电大学 | Implementation method of full-band adjustable absorption-transmission window in columnar photonic crystal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114967124A (en) * | 2022-06-08 | 2022-08-30 | 南京邮电大学 | Implementation method of full-band adjustable absorption-transmission window in columnar photonic crystal |
| CN114967124B (en) * | 2022-06-08 | 2024-04-05 | 南京邮电大学 | Method for realizing full-band adjustable absorption-transmission window in columnar photonic crystal |
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