CN113972500A - Switchable circular dichroism resonator - Google Patents
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- CN113972500A CN113972500A CN202111256287.0A CN202111256287A CN113972500A CN 113972500 A CN113972500 A CN 113972500A CN 202111256287 A CN202111256287 A CN 202111256287A CN 113972500 A CN113972500 A CN 113972500A
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- 238000002983 circular dichroism Methods 0.000 title claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 18
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- 230000001939 inductive effect Effects 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 230000010287 polarization Effects 0.000 abstract description 13
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- 238000004891 communication Methods 0.000 abstract description 2
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- 238000004088 simulation Methods 0.000 description 6
- 238000005388 cross polarization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
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- 238000005259 measurement Methods 0.000 description 3
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0026—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices having a stacked geometry or having multiple layers
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Abstract
The invention belongs to the field of microwave devices, and particularly relates to a switchable circular dichroism resonator. The electromagnetic radiation sensor comprises a metamaterial layer, a substrate layer and a metal back plate which are sequentially arranged along an electromagnetic propagation direction, wherein the metamaterial layer comprises an artificial metal pattern structure, and a pair of PIN diodes and an inductance device which are welded on the artificial metal pattern structure and far away from one side of the substrate layer. The pair of PIN diodes realize on-off alternation by changing voltage, so that the left-hand circular dichroism resonator and the right-hand circular dichroism resonator can be switched; by optimizing the structural design, the invention realizes the broadband selective absorption of the electromagnetic waves with different circular polarizations by perfectly switching the two modes of the left-hand circular dichroic resonator and the right-hand circular dichroic resonator. The left-handed circular dichroism resonator absorbs LCP waves and converts RCP waves into LCP waves; the right-hand circular dichroic resonator absorbs the RCP wave and converts the LCP wave into an RCP wave. The invention has wide application space in the fields of communication, information processing, imaging and the like.
Description
Technical Field
The invention belongs to the field of microwave devices, and particularly relates to a switchable circular dichroism resonator.
Background
The first discovery of chirality is in natural structures and molecules, such as shells with mirror symmetry, DNA double helix structures, amino acid molecules, etc. These biological structures exhibit relatively weak three-dimensional chirality and are difficult to modify, and thus are not easily applied to practical applications. The chiral metamaterial improves the chiral characteristic and the electromagnetic response characteristic of the metamaterial, and can be used for controlling the physical parameters of the metamaterial in different fields and obtaining the response of different frequency spectrums. The research on the chiral metamaterial is always an important research hotspot in the field of metamaterials, and the chiral metamaterial has unique electromagnetic and optical properties such as asymmetric transmission, polarization conversion, circular dichroism, chiral negative refractive index and the like. Compared with a three-dimensional chiral metamaterial, the planar two-dimensional chiral metamaterial has a torsional characteristic. When the planar metamaterial is irradiated by electromagnetic waves, the influence of the twisted structure on the transmission or scattering effect of the planar metamaterial draws a great deal of attention. In fact, researchers have theoretically demonstrated that planar metamaterials with such twisted structures have unique capabilities for manipulating electromagnetic waves. In addition, the planar structures which appear in succession further prove that the two-dimensional chiral metamaterial has different rotation angles for circularly polarized waves from experiments. The chiral electromagnetic metamaterial can be applied to the design of devices such as a circular polarizer, a circular polarization converter, an energy collector and the like.
In recent years, many new designs for enhancing Circular Dichroism (CD) in the microwave and near infrared regions have been reported and experimentally verified. The three-dimensional helical structure has strong intrinsic chirality and dipole-dipole interaction, resulting in a larger CD. The multilayer chiral structure can generate a large CD effect due to interlayer interaction. Furthermore, if the subwavelength chiral structure simultaneously destroys Cn(n>2) Rotational symmetry and mirror symmetry, then larger CD values can be produced. Introducing intoAfter blocking, the circular dichroism resonator working in the microwave band can realize broadband efficient circular dichroism. However, most circular dichroism resonators are fixed in function and can only absorb circularly polarized waves of a specific rotation direction.
Disclosure of Invention
To solve the above technical problem, the present invention provides a switchable circular dichroism resonator.
In order to achieve the purpose, the invention adopts the following technical scheme:
a switchable circular dichroism resonator comprises a metamaterial layer, a substrate layer and a metal plate bottom layer which are sequentially arranged along an electromagnetic propagation direction, wherein the metamaterial layer, the substrate layer and the metal plate bottom layer are sequentially stacked together, the metamaterial layer comprises an artificial metal pattern structure, and a pair of PIN diodes and inductance devices which are welded on the artificial metal pattern structure and are far away from one side of the substrate layer; the artificial metal pattern structure is a double-opening resonance ring.
Furthermore, the pair of PIN diodes are anti-symmetrically welded on the double-opening resonant ring, and one diode is always kept in a conducting state, and the other diode is kept in an off state.
Further, the PIN diode is in a type BAP 70-02.
Further, when the voltage across the load is +33.48V, the PIN diode on the left side is turned on, which is equivalent to a resistance of 100 Ω, and the PIN diode on the right side is turned off, which is equivalent to a resistance of 200M Ω; when the voltage across the load is-33.48V, the opposite is true.
Furthermore, the inductance device welded by the double-opening resonant ring is a patch inductor, the inductance value is 27nH, and the inductance device is welded between the feed structure and the unit structure as a radio frequency choke coil.
Further, the substrate layer is an FR4 substrate with the thickness of 3 mm.
Further, the thickness of the metal back plate is 0.017 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention realizes the selective absorption of broadband spin of electromagnetic waves with different circular polarizations. The left-handed circular dichroic resonator absorbs left-handed circularly polarized (LCP) waves and converts right-handed circularly polarized (RCP) waves into LCP waves, which means that LCP waves are reflected in this state. The right-hand circular dichroic resonator functions exactly the opposite. At 8.3-11.6GHz, the CD in both circular dichroic resonator modes remains above 0.7, and reaches a maximum of 0.83 at f-9.9 GHz.
(2) The invention realizes that the thickness of the circular dichroism resonator structure is only one tenth of the wavelength, is beneficial to chip integration, has high universality, and can be applied to communication, information processing, imaging and polarization sensitive detection of electromagnetic waves.
(3) The invention realizes that r is in two working modes of the circularly polarized resonatorxxAnd rxyThe reflection amplitude of (a) is approximately uniform in the vicinity of f-10.4 GHz. The phases of the linear cross polarized reflected waves under the action of the y polarized wave and the x polarized wave are completely the same in the whole working frequency range.
(4) The invention realizes that the phase difference between the co-polarized reflections is almost close to pi at the incidence of y and x polarized waves in the working frequency band of 9.0-10.8 GHz. In the left-handed circular dichroism resonator mode, the linear cross polarization reflection phase lags behind a linear common polarization reflection term pi/2, namely, the left-handed circular polarization spin selective absorption is realized in the working frequency band. When the mode is switched to a right-handed circular dichroism resonator mode, the phase lag of the linear cross polarization reflection is about 3 pi/2 of the linear co-polarization reflection term, namely, the right-handed circular polarization spin selective absorption is realized in the working frequency band.
(5) The metamaterial artificial micro-structure unit printing adopted by the invention has very mature processing technologies with PIN diode and inductance welding at present.
Drawings
Figure 1 is a schematic diagram of a switchable circular dichroic resonator in left-hand circular dichroic (a) and right-hand circular dichroic (b) modes of operation.
Figure 2 is a schematic diagram of the three-dimensional structure of a switchable circular dichroic resonator (a) and pin diodes integrated on the device in an anti-symmetric configuration in a left-hand circular dichroic mode of operation (b) and a right-hand circular dichroic mode of operation (c).
Fig. 3 is a simulation plot of amplitude (a) and phase (c) for a left-hand circular dichroism mode of operation, and amplitude (b) and phase (d) for a right-hand circular dichroism mode of operation, at linear polarized wave incidence.
Fig. 4 is a graph showing the absorption coefficient (a) and reflectance simulation curve (c) of LCP waves and RCP waves in the left-hand circular dichroism mode of operation, and the absorption coefficient (b) and reflectance simulation curve (d) of LCP waves and RCP waves in the right-hand circular dichroism mode of operation, at normal electromagnetic wave incidence.
Fig. 5 shows the measured absorption amplitude (a) and reflection amplitude (c) for the left-hand circular dichroism mode of operation, and the absorption amplitude (b) and reflection amplitude (d) for the right-hand circular dichroism mode of operation, at normal incidence of the electromagnetic wave.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments, but the invention should not be construed as being limited thereto. The technical means used in the following examples are conventional means well known to those skilled in the art, and materials, reagents and the like used in the following examples can be commercially available unless otherwise specified.
A switchable circular dichroism resonator is shown in figure 1, each unit structure is composed of a metamaterial layer, a 3mm FR4 substrate layer and a 0.017mm metal back plate which are sequentially stacked from top to bottom (in the electromagnetic propagation direction), the metamaterial layer comprises an artificial metal pattern structure, and a pair of PIN diodes (model number BAP 70-02) and an inductance device (the inductance device is a patch inductor, and the inductance device is 27nH and is welded between a feeding structure and the unit structure as a radio frequency choke coil) which are welded on the artificial metal pattern structure and far away from one side of the substrate layer.
When the voltage at two ends of the load is +33.48V, the PIN diode at the left side is conducted and is equivalent to a resistance of 100 ohms, the PIN diode at the right side is turned off and is equivalent to a resistance of 200 MOhms, and at the moment, the resonator works in a left-hand circular dichroism resonator mode, absorbs LCP waves and converts RCP waves into LCP waves; when the voltage across the load is-33.48V, the opposite is true.
We examine the switchable circular dichroism resonator described above to further illustrate the broadband spin selective absorption properties of electromagnetic waves with different circular polarizations provided by the present invention.
Fig. 2(a) is a three-dimensional schematic diagram of a two pin diode integrated on a device in an anti-symmetric configuration, fig. 2(b) is a schematic diagram of a left-hand circular dichroic resonator, and fig. 2(c) is a schematic diagram of a right-hand circular dichroic resonator, with the parameters specified; before and after changing the bias voltage, one pin diode is always in the ON state and the other pin diode is always in the OFF state. The proposed switchable circular dichroic resonator operates in a left-handed circular dichroic resonator mode when the PIN diode I is turned on and the PIN diode II is turned off. Similarly, when PIN diode I is turned off and PIN diode II is turned on, a right-handed circular dichroic resonator mode can be obtained.
FIG. 3 is a graph of amplitude and phase simulations of two circular dichroism resonator modes of operation under simulated linear polarization incidence; in two operating modes, rxxAnd rxyThe reflection amplitude of (a) is approximately uniform in the vicinity of f-10.4 GHz. The phase of the linear cross polarization reflection under the action of the y-polarized wave and the x-polarized wave is completely the same in the whole working frequency range. At the 9.0-10.8GHz operating band, the phase difference between the co-polarized reflections is nearly pi at the occurrence of y-and x-polarized waves. In the left-handed circular dichroism resonator mode, the linear cross polarization reflection phase lags behind a linear common polarization reflection term pi/2, namely, the left-handed circular polarization spin selective absorption is realized in the working frequency band. When the mode is switched to a right-handed circular dichroism resonator mode, the phase lag of the linear cross polarization reflection is about 3 pi/2 of the linear co-polarization reflection term, namely, the right-handed circular polarization spin selective absorption is realized in the working frequency band.
FIG. 4 is a graph of simulated absorption coefficient and reflectivity of LCP waves and RCP waves for two circular dichroic resonator modes of operation at normal electromagnetic wave incidence; in fig. 4(a) and (b), two solid lines represent absorptance of the LCP waves and the RCP waves, respectively. It can be found that the circular dichroism resonators of the two modes have a large CD, Δ R is maintained above 0.7 at 8.3-11.6GHz, and Δ R reaches 0.83 at f-9.9 GHz. In fig. 4(c) and (d), two solid lines represent reflectances of the LCP wave and the RCP wave, respectively, and two broken lines represent cross-polarized wave reflection components, respectively. As can be seen from fig. 4(c), the left-handed circular dichroic resonator exhibits a high reflection response at RCP wave normal incidence and a high absorption response at LCP wave normal incidence. When switched to a right-handed circular dichroic resonator, it exhibits a highly absorbing response at normal incidence of the RCP wave and a highly reflective response at normal incidence of the LCP wave. Thus, the response of the two modes to LCP and RCP waves is different.
FIG. 5 shows the absorption and reflection spectra measured at 7.5-15 GHz. And comparing the simulation result with the measurement result, wherein the simulation result and the measurement result show good consistency. The error is caused by the difference between the actual diode and the equivalent circuit model of the diode, the error in the manufacture of the PCB and the error in the measurement.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A switchable circular dichroism resonator is characterized by comprising a metamaterial layer, a substrate layer and a metal back plate which are sequentially arranged along an electromagnetic propagation direction, wherein the metamaterial layer, the substrate layer and the metal back plate are sequentially stacked together, the metamaterial layer comprises an artificial metal pattern structure, and a pair of PIN diodes and inductance devices which are welded on the artificial metal pattern structure and are far away from one side of the substrate layer; the artificial metal pattern structure is a double-opening resonance ring.
2. The switchable circular dichroic resonator according to claim 1, wherein said pair of PIN diodes are anti-symmetrically soldered on said double split ring, always one diode being kept on and the other diode being kept off.
3. The switchable circular dichroic resonator according to claim 2, wherein said PIN diode model is BAP 70-02.
4. A switchable circular dichroic resonator as claimed in claim 3, wherein when the voltage across the load is +33.48V, the PIN diode on one side is on, equivalent to a resistance of 100 Ω, and the PIN diode on the other side is off, equivalent to a resistance of 200M Ω; when the voltage across the load is-33.48V, the opposite is true.
5. The switchable circular dichroic resonator according to claim 4, wherein said dual split ring welded inductive device is a patch inductor with an inductance of 27nH, welded as a radio frequency choke between the feed structure and the cell structure.
6. The switchable circular dichroic resonator according to claim 1, wherein said substrate layer is a FR4 substrate having a thickness of 3 mm.
7. The switchable circular dichroic resonator according to claim 1, wherein the thickness of said metal back plate is 0.017 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114530705A (en) * | 2022-03-22 | 2022-05-24 | 中国人民解放军空军工程大学 | Circular dichroism-based absorption and transmission integrated frequency selection surface and antenna housing |
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|---|---|---|---|---|
| EP3101464A1 (en) * | 2015-06-02 | 2016-12-07 | Baden-Württemberg Stiftung gGmbH | Device with switchable chiral optical properties, device for polarization modulation, and their use |
| WO2021169401A1 (en) * | 2020-02-28 | 2021-09-02 | 中国科学院上海技术物理研究所 | Integrated high-extinction ratio infrared circular polarization detector and design method |
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- 2021-10-27 CN CN202111256287.0A patent/CN113972500A/en active Pending
Patent Citations (2)
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|---|---|---|---|---|
| EP3101464A1 (en) * | 2015-06-02 | 2016-12-07 | Baden-Württemberg Stiftung gGmbH | Device with switchable chiral optical properties, device for polarization modulation, and their use |
| WO2021169401A1 (en) * | 2020-02-28 | 2021-09-02 | 中国科学院上海技术物理研究所 | Integrated high-extinction ratio infrared circular polarization detector and design method |
Non-Patent Citations (4)
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| ZHIBIAO ZHU: "Switchable circular dichroism resonators for spin selective absorption" * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114530705A (en) * | 2022-03-22 | 2022-05-24 | 中国人民解放军空军工程大学 | Circular dichroism-based absorption and transmission integrated frequency selection surface and antenna housing |
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