CN114725646A - Multi-band terahertz metamaterial resonator with ultrahigh quality factor - Google Patents
Multi-band terahertz metamaterial resonator with ultrahigh quality factor Download PDFInfo
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- CN114725646A CN114725646A CN202210233105.6A CN202210233105A CN114725646A CN 114725646 A CN114725646 A CN 114725646A CN 202210233105 A CN202210233105 A CN 202210233105A CN 114725646 A CN114725646 A CN 114725646A
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- 239000000758 substrate Substances 0.000 claims abstract description 18
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010453 quartz Substances 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 4
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- 238000001228 spectrum Methods 0.000 description 4
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- 239000000126 substance Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
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- 239000003989 dielectric material Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005610 quantum mechanics Effects 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000000411 transmission spectrum Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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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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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a multiband terahertz metamaterial resonator with an ultrahigh quality factor, which comprises a plurality of units which are periodically arranged, wherein each unit has the same structure, and comprises a substrate consisting of quartz and a structure A, a structure B, a structure C and a structure D which are formed by four lithium tantalate films on the substrate.
Description
Technical Field
The invention belongs to the technical field of metamaterials, and particularly relates to a multiband terahertz metamaterial resonator with an ultrahigh quality factor.
Background
Terahertz (THz) waves refer to electromagnetic waves with the frequency range of 0.1THz-10 THz (the wavelength is 3mm-30 mu m), the frequency spectrum of the THz waves lies between the infrared electromagnetic waves and the microwave frequency spectrum in the electromagnetic spectrum, and the THz waves have the advantages of the infrared electromagnetic waves and the microwaves. The photon energy of terahertz radiation is lower than the energy between most chemical bonds, and the terahertz radiation has good penetrating characteristics for most dielectrics. In addition, the frequency band of the terahertz wave is wide, phonons and other elements of a plurality of condensed state systems are excited, vibration and rotation energy levels of a plurality of biomacromolecules are in the wave band, and the wave band contains abundant spectral information, so that the spectral characteristics of other substances in the wave band can be researched, and the substances can be detected and distinguished through characteristic resonance. In recent 30 years, with the continuous development of terahertz time-domain spectroscopy and low-dimensional semiconductor technology, research on terahertz waves is actively conducted in various countries such as europe, america and asia, and the terahertz technology raises hot tide at home and abroad.
The metamaterial is a novel composite material formed by manual processing, and is formed by periodically or non-periodically arranging basic units with specific geometric shapes and specific materials in a space, and the specific functions of the metamaterial depend on the structures of the basic units. Metamaterials have extraordinary electromagnetic properties such as negative dielectric constant, negative permeability, negative refractive index, and reverse doppler shift, and have attracted more attention and research.
Ring dipoles, a fundamental electromagnetic excitation different from conventional electric and magnetic dipoles, was originally proposed by zerloduie in explaining the parity violations of nuclei. The magnetic ring dipole is generated by the polarization current flowing in the ring surface along the meridian, and the electric ring dipole is generated by the polarization current flowing in the ring surface direction. Although both of these circular dipoles can exist in natural media, they are weaker and are often masked by stronger electric and magnetic multipoles, making them difficult to measure. Until the metamaterial is appeared, the ring dipole can be made to respond to an observable magnitude, and the ring dipole can realize resonance with a high quality factor, which attracts the attention of researchers.
The continuum bound state is a wave that remains localized, coexisting with a continuous radiated wave that can carry away energy. While BIC was originally proposed in quantum mechanics, it is a general wave phenomenon and has been observed in electromagnetic waves, acoustic waves in air, water waves, and elastic waves in solids. With an infinitely high quality factor at the ideal BIC, virtually all possible ideal BIC becomes leakage mode modes with a high Q factor, also known as quasi-BIC (quadrature-BIC) modes, for a practical device (finite size structure). Symmetric breaks can be introduced into the structural units with C2 symmetry in the super-surface to convert the BIC mode into a quasi-BIC mode with a finite high quality factor, and the BIC mode realized by the method of introducing the symmetric breaks is called symmetric protection type BIC. The quality factor of the symmetric protection type BIC depends on the asymmetric quantity, the height of the quality factor of a resonance peak under a corresponding BIC mode can be changed by changing the size of the asymmetric quantity, the radiation quality factor proposed in 2018 in the period of volume 19 of Physical Review Letters 121 is in direct proportion to the inverse square of the asymmetric weighing, and a new thought is provided for designing a super-surface supporting high quality factor. In conclusion, the high-quality factor resonance is obtained by the annular dipole excited BIC based on the terahertz metamaterial, and high-sensitivity sensing can be realized.
Disclosure of Invention
The invention aims to provide a multiband terahertz metamaterial resonator with an ultrahigh quality factor, which solves the problems that metal is easily oxidized, high in loss and complex in structure in a high-quality factor metal metamaterial resonator in the prior art, when an object to be detected is deposited on a metamaterial, the dielectric environment around a cross structure is changed, so that a resonance peak is subjected to frequency shift, and high-sensitivity object to be detected sensing can be realized through the frequency shift of the resonance peak with the ultrahigh quality factor.
The invention adopts the technical scheme that a multiband terahertz metamaterial resonator with an ultrahigh quality factor comprises a plurality of units which are periodically arranged, wherein each unit has the same structure and consists of a substrate consisting of quartz, and a structure A, a structure B, a structure C and a structure D which are formed by lithium tantalate films and arranged on the substrate.
The present invention is also characterized in that,
the substrate has a square cross section.
The period of the substrate is 63-70 μm and the height is 50-80 μm.
The structure A, the structure B, the structure C and the structure D are uniformly distributed on the upper surface of the substrate, and the cross sections of the structure A, the structure B, the structure C and the structure D are all in a cross shape.
The distances among the centers of the structure A, the structure B, the structure C and the structure D are equal and are all 24-30 mu m.
The heights of the structure A, the structure B, the structure C and the structure D are equal and are all 8-13 mu m.
The lengths of the structure A, the structure B, the structure C and the structure D in the x direction and the y direction are all equal and are all 20-27 mu m.
Compared with a metal metamaterial resonator with a high quality factor, the multiband terahertz metamaterial resonator with the ultrahigh quality factor has the advantages that the multiband terahertz metamaterial resonator with the ultrahigh quality factor based on the all-dielectric can achieve a higher quality factor due to the inevitable ohmic loss of metal, and is simple in structure, high in stability and free of multilayer metamaterial stacking.
Drawings
FIG. 1 is a three-dimensional view of a multi-band terahertz metamaterial resonator unit with ultra-high quality factor in accordance with the present invention;
FIG. 2 is a top view of a multi-band terahertz metamaterial resonator unit with an ultra-high quality factor in accordance with the present invention;
FIG. 3 is a transmission light spectrum diagram of a multiband terahertz metamaterial resonator with an ultra-high quality factor in an operating frequency band according to the invention;
FIG. 4 is a scanning diagram of the sensitivity of the multiband terahertz metamaterial resonator unit with the ultrahigh quality factor when used for refractive index sensing.
In the figure, 1 is a substrate, 2 is a structure A, 3 is a structure B, 4 is a structure C, and 5 is a structure D.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
The structure of the multiband terahertz metamaterial resonator with the ultrahigh quality factor is shown in fig. 1 and fig. 2, and the multiband terahertz metamaterial resonator is formed by a plurality of units which are periodically arranged, wherein each unit has the same structure, and is composed of a substrate 1 made of quartz, and a structure A2, a structure B3, a structure C4 and a structure D5 which are formed by lithium tantalate thin films on the substrate 1.
The substrate 1 has a square cross section.
The period of the substrate 1 is 63-70 μm and the height is 50-80 μm.
The structure A2, the structure B3, the structure C4 and the structure D5 are uniformly distributed on the upper surface of the substrate 1, and the cross sections of the structure A2, the structure B3, the structure C4 and the structure D5 are all cross-shaped.
The distances among the centers of the structure A2, the structure B3, the structure C4 and the structure D5 are equal and are all 24-30 mu m.
The heights of the structure A2, the structure B3, the structure C4 and the structure D5 are equal and are all 8-13 mu m.
The lengths of the structure A2, the structure B3, the structure C4 and the structure D5 in the x direction and the y direction are all equal and are 20-27 mu m.
Asymmetric parameters are introduced by changing the lengths of two adjacent structural units in the two y directions, namely a parameter k is introduced, the mirror symmetry of the units is broken, and a symmetrical protection type continuum bound state can be realized, so that a resonance peak with a high quality factor is excited, and the quality factor is in direct proportion to the inverse square of the asymmetric weight.
Fig. 3 shows the transmission spectra corresponding to different asymmetric parameters k under a certain parameter combination, and it can be seen that four resonance peaks are obtained, which are respectively defined as mode 1, mode 2, mode 3 and mode 4 according to the frequency positions from high to low. It can be seen that mode 2, mode 3, mode 4 have ultra-high quality factors and vanish when k is 0, meaning that mode 2, mode 3, mode 4 now transforms from quasi-BIC to ideal BIC, theoretically with infinitely high quality factors. And as can be seen from fig. 3, as | k | is increased, the quality factors of mode 2, mode 3 and mode 4 are decreased, and in fact, the quality factors satisfy the proportional relation with the inverse square of | k |, so that a new idea can be provided for designing a super-surface design supporting high quality factors.
In addition, on the basis of the same parameter combination, an asymmetric parameter k is taken to be 0.5 μm, a 21 μm object to be measured is deposited on a multiband terahertz metamaterial resonator with an ultrahigh quality factor, the refractive index of the object to be measured is scanned, the expressed sensing performance is shown in fig. 4, and it can be seen that both mode 2 and mode 3 can achieve high-sensitivity sensing of 445GHz/RIU or above.
Claims (7)
1. The multiband terahertz metamaterial resonator with the ultrahigh quality factor is characterized by comprising a plurality of units which are periodically arranged, wherein each unit has the same structure and comprises a substrate (1) made of quartz, and a structure A (2), a structure B (3), a structure C (4) and a structure D (5) which are made of lithium tantalate films and arranged on the substrate (1).
2. The ultra-high quality factor multiband terahertz metamaterial resonator according to claim 1, wherein the substrate (1) is square in cross-section.
3. The multiband terahertz metamaterial resonator with ultra-high quality factor as claimed in claim 1, wherein the substrate (1) has a period of 63-70 μm and a height of 50-80 μm.
4. The resonator of claim 1, wherein the structure A (2), the structure B (3), the structure C (4) and the structure D (5) are uniformly arranged on the upper surface of the substrate (1), and the cross sections of the structure A (2), the structure B (3), the structure C (4) and the structure D (5) are all cross-shaped.
5. The resonator of claim 1, wherein the centers of the structure A (2), the structure B (3), the structure C (4) and the structure D (5) are at equal distances of 24-30 μm.
6. The resonator of claim 1, wherein the heights of the structure A (2), the structure B (3), the structure C (4) and the structure D (5) are equal and are 8-13 μm.
7. The resonator of claim 1, wherein the lengths of the structure A (2), the structure B (3), the structure C (4) and the structure D (5) in the x and y directions are equal and are all 20-27 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210233105.6A CN114725646A (en) | 2022-03-09 | 2022-03-09 | Multi-band terahertz metamaterial resonator with ultrahigh quality factor |
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| CN202210233105.6A CN114725646A (en) | 2022-03-09 | 2022-03-09 | Multi-band terahertz metamaterial resonator with ultrahigh quality factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115824977A (en) * | 2022-09-26 | 2023-03-21 | 厦门大学 | Mid-infrared all-dielectric super-surface chiral molecular sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557048A (en) * | 2018-11-14 | 2019-04-02 | 安阳师范学院 | A kind of terahertz wave band Meta Materials sensor |
| CN113422196A (en) * | 2021-05-27 | 2021-09-21 | 山东师范大学 | Terahertz heat radiation source capable of generating ultra-narrow bandwidth and working method thereof |
| CN214277897U (en) * | 2020-10-20 | 2021-09-24 | 中国计量大学 | Near-infrared band metamaterial refractive index sensor |
| CN114088663A (en) * | 2021-10-29 | 2022-02-25 | 西安理工大学 | Terahertz sensor based on symmetrical protection type continuum bound state |
-
2022
- 2022-03-09 CN CN202210233105.6A patent/CN114725646A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557048A (en) * | 2018-11-14 | 2019-04-02 | 安阳师范学院 | A kind of terahertz wave band Meta Materials sensor |
| CN214277897U (en) * | 2020-10-20 | 2021-09-24 | 中国计量大学 | Near-infrared band metamaterial refractive index sensor |
| CN113422196A (en) * | 2021-05-27 | 2021-09-21 | 山东师范大学 | Terahertz heat radiation source capable of generating ultra-narrow bandwidth and working method thereof |
| CN114088663A (en) * | 2021-10-29 | 2022-02-25 | 西安理工大学 | Terahertz sensor based on symmetrical protection type continuum bound state |
Non-Patent Citations (3)
| Title |
|---|
| SONG HAN等: "Extended Bound States in the Continuum with Symmetry-Broken Terahertz Dielectric Metasurfaces", 《ADVANCED OPTICAL MATERIALS》, pages 2 * |
| YULIN WANG等: "Ultrasensitive terahertz sensing with high-Q toroidal dipole resonance governed by bound states in the continuum in all-dielectric metasurface", 《NANOPHOTONICS 2021》, pages 2 - 3 * |
| 岳莉莎: "全介质超材料太赫兹功能器件的设计与特性分析", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115824977A (en) * | 2022-09-26 | 2023-03-21 | 厦门大学 | Mid-infrared all-dielectric super-surface chiral molecular sensor |
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