Tailoring the dispersion characteristics in planar arrays of discrete and coalesced split ring resonators

Spanos, Ioannis; Stevens, Christopher John; Solymar, Laszlo; Shamonina, Ekaterina

doi:10.1038/s41598-023-47216-3

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…VO 2 represents the dielectric state; the electromagnetic properties of the dielectric VO 2 are almost no different from those of general media; in this case, the equivalent structural diagram of the top patterned layer is shown in Figure 2b, which represents the microstrip resonance. When the dielectric VO 2 changes to the metal VO 2 , the resonant mode of the unit cell changes from microstrip resonance to LC resonance [28,29], correspondingly. Analyzing the condition in which VO 2 is in the metal state, on account of its metal−like electromagnetic properties, the metal VO 2 can be regarded as a conductor.…”

Section: Structure Of the Designed Unit Cellmentioning

confidence: 99%

A Terahertz Programmable Digital Metasurface Based on Vanadium Dioxide

Pan,

Liu,

Peng

et al. 2024

Photonics

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Metasurfaces can realize the flexible manipulation of electromagnetic waves, which have the advantages of a low profile and low loss. In particular, the coding metasurface can flexibly manipulate electromagnetic waves through controllable sequence encoding of the coding units to achieve different functions. In this paper, a three−layer active coding metasurface is designed based on vanadium dioxide (VO2), which has an excellent phase transition. For the designed unit cell, the top patterned layer is composed of two split square resonant rings (SSRRs), whose gaps are in opposite directions, and each SSRR is composed of gold and VO2. When VO2 changes from the dielectric state to the metal state, the resonant mode changes from microstrip resonance to LC resonance, correspondingly. According to the Pancharatnam−Berry (P−B) phase, the designed metasurface can actively control terahertz circularly polarized waves in the near field. The metasurface can manipulate the order of the generated orbital angular momentum (OAM) beams: when the dielectric VO2 changes to metal VO2, the order l of the OAM beams generated by the metasurface changes from −1 to −2, and the purity of the generated OAM beams is relatively high. It is expected to have important application values in terahertz wireless communication, radar, and other fields.

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Section: Structure Of the Designed Unit Cellmentioning

confidence: 99%

A Terahertz Programmable Digital Metasurface Based on Vanadium Dioxide

Pan,

Liu,

Peng

et al. 2024

Photonics

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show abstract

“…Thus far for MIWs, the dispersion equation relating the excitation frequency with a complex propagation constant has been defined in theory for mono-atomic (single resonant element per periodic unit) MIWs in 1-, 2-, and 3- dimensions and for di-atomic (two resonant elements per periodic unit) MIWs in 1-dimension 9 , 13 . In more unique geometric scenarios, the dispersion behavior of coalesced resonant elements has also been defined in detail along with di-atomic geometries that support both backward and forward waves 14 , 15 . Besides the wave guiding theory, the wave behavior has also been defined through lossless and lossy materials and in the presence of noise 16 – 19 .…”

Section: Introductionmentioning

confidence: 99%

Characterizing the dispersion behavior of poly-atomic magnetic metamaterials

Jenkins,

Kiourti

2024

Sci Rep

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The propagation of magnetoinductive (MI) waves across magnetic metamaterials known as magnetoinductive waveguides (MIWs) has been an area of interest for many applications due to the flexible design and low-loss performance in challenging radio-frequency (RF) environments. Thus far, the dispersion behavior of MIWs has been limited to mono- and diatomic geometries. In this work, we present a recursive method to generate the dispersion equation for a general poly-atomic MIW. This recursive method greatly simplifies the ability to create closed-form dispersion equations for unique poly-atomic MIW geometries versus the previous method. To demonstrate, four MIW geometries that have been selected for their unique symmetries are analyzed using the recursive method. Using applicable simplifications brought on by the geometric symmetries, a closed-form dispersion equation is reported for each case. The equations are then validated numerically and show excellent agreement in all four cases. This work simultaneously aids in the further development of MIW theory and offers new avenues for MIW design in the presented dispersion equations.

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Tunable capacitor arrays of coalesced resonators for dispersion control

Spanos,

Stevens,

Solymar

et al. 2024

EPJ Appl. Metamat.

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In this work, the coupling and dispersion characteristics of coalesced resonators as a function of their capacitance is investigated, with the goal of developing novel ways of dispersion control. When planar resonators are coalesced and their shared side is capacitively loaded, the total coupling coefficient is positive, allowing for the propagation of forward magnetoinductive waves. By varying the capacitive load on their shared side, the sign and size of the total coupling can be controlled. This is demonstrated in an 11-element array, where the magnetoinductive wave can switch between forward and backward propagation depending on the capacitive load of the shared side. Furthermore, there is a critical value of the ratio between the capacitive loads on shared and non-shared sides, at which the coupling becomes zero, effectively cutting of wave propagation on the structure. It is shown that the structure can be tuned in two ways: maintain a constant operating frequency while tuning the coupling, or tune the operating frequency while keeping the coupling constant. At the same time, an optimisation procedure for setting up numerical simulations to match the experimental data is proposed. The simulations provided significant insight on the electric coupling's behaviour. Experimental, numerical and analytical data verify this behaviour.

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Tailoring the dispersion characteristics in planar arrays of discrete and coalesced split ring resonators

Cited by 3 publications

References 36 publications

A Terahertz Programmable Digital Metasurface Based on Vanadium Dioxide

A Terahertz Programmable Digital Metasurface Based on Vanadium Dioxide

Characterizing the dispersion behavior of poly-atomic magnetic metamaterials

Tunable capacitor arrays of coalesced resonators for dispersion control

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