Duality of Spoof Surface Plasmon Polaritons on the Complementary Structures of Ultrathin Metal Films

Liang, Chengyao; Liu, Liang; Chai, Jiwang; Xiang, Hong; Han, Dezhuan

doi:10.1002/andp.201900138

Cited by 7 publications

(4 citation statements)

References 35 publications

(44 reference statements)

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“…There is an EM duality for the eigenstates on complementary metallic ultrathin structures inserted in a homogenous, isotropic, and source-free medium [24]. The explicit duality correspondence of EM fields on complementary formed thin metallic films warrants that the surface modes on dual-complementary structures share strictly the same dispersion.…”

Section: Theorem Of Pseudospin Statesmentioning

confidence: 95%

“…The space inside the waveguide filled with Teflon with ε r = 2.1, δ t = 0.001. Note that, as long as the value of h remains in the subwavelength limit, i.e., h << λ , the EM duality requirement and, hence the mirror reflection symmetries are satisfied adequately well [24]. However, exploiting a bandgap structure yields a reduction in operating bandwidth [5].…”

Section: Ultra Wide-band One-dimensional Waveguide With Symmetric Lin...mentioning

confidence: 99%

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Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides

Ahmadi¹,

Khavasi²

2022

Preprint

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In this work, we prove a theorem that states the electromagnetic (EM) duality correspondence between eigenmodes of complementary structures, induces counterpropagating spin-polarized states in different types of waveguides where mirror reflection symmetries are preserved around one (or more) arbitrary plane(s). Similar to photonic topological insulators (PTIs), which support topologically non-trivial direction-dependent spin polarizations, our pseudospin-polarized systems support one-way states that manifest robustness, however, the advantage of our structures is that they can be implemented in extremely broad bandwidth simply using artificial dual impedance surfaces. Consequently, there is no need to bulk electromagnetic materials. On the basis of our theory, the concept of the pseudospin-polarized waveguide can be realized using Babinet complementary structures, ranging from microwave to THz regime. We design and develop various unidirectional waveguides and spin-filtered feature in the microwave regime is investigated.

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Section: Theorem Of Pseudospin Statesmentioning

confidence: 95%

Section: Ultra Wide-band One-dimensional Waveguide With Symmetric Lin...mentioning

confidence: 99%

Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides

Ahmadi¹,

Khavasi²

2022

Preprint

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“…[11] Then, the route to flexible technology has been opened for producing ultrathin SSPP transmission lines (TLs) where the relation dispersion can be adjusted by means of geometry. Especially, it was shown that a better spatial confinement of the field can be achieved both by thinning the metallic pattern [12,13] and by lengthening the groove depths [14][15][16][17] of a comb-shaped structure, or by more complicated structures as periodic T-shaped [18,19] and trapezoidal [14,20] grooves. Finally, the spatial confinement can also be adjusted and tuned by loading the SSPP TL with lumped capacitors [21] and varactors, [22] respectively.…”

Section: Introductionmentioning

confidence: 99%

Wireless Experimental Determination of Dispersion Curves of Spoof Surface Plasmon Polariton Modes Supported by a Transmission Line

Ghaddar

Lheurette

Burgnies

2021

Physica Status Solidi (b)

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Excitation of spoof surface plasmon polaritons (SSPPs) by means of a dipole antenna is considered to experimentally assess the dispersion curves of the two first modes guided by a meandered transmission line (TL). First, simulated dispersion curves bring out even and odd symmetries of the SSPP modes highlighted by magnetic field mappings. Then, a dipole antenna with vertical and horizontal polarization is proposed for generating the even and odd propagation modes by near‐field magnetic coupling, respectively. Experimental validation is carried out with a SSPP TL fabricated on a flexible substrate (Kapton). For each mode, experiments show a pass‐band feature of the transmission between two antennas coupled to the SSPP TL with ripples related to the presence of a standing wave. Finally, the dispersion curves are experimentally achieved using a de‐embedding method applied on the scattering parameters directly measured between antennas without the need of a mode conversion structure. Experimental results are favorably compared with the simulated transmission and dispersion curves.

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“…However, an MPA is inversely treated as a band-stop FSS when it is a very thin structure. Although conventional studies have discussed clarifications of the relationship between SSPP modes and the structural parameters or the boundary conditions including duality 38 , the relevant part of an SSPP theory in terms of structural thickness in structure has not been discussed in detail. In other words, an MPA has the potential to provide evidence of the breakdown of Babinet's principle.…”

mentioning

confidence: 99%

Analysis and observation of the breakdown of Babinet’s principle in complementary spoof surface plasmon polariton structures

Itami

Sakai

2020

Sci Rep

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Go itami * & osamu Sakai A metal plate array (MpA) which is a structure complimentary to a metal hole array (MHA), supports spoof surface plasmon polaritons (SSpp) as well as an MHA does. Babinet's principle attributes the phenomenon of duality to transmission characteristics of the complimentary impedance surfaces because of the symmetry of the behaviors of electric and magnetic fields. However, it is also a fact that the complimentary structures do not follow this principle if they have wavelength-size thickness, because electromagnetic waves do not treat such thick structures as a boundary surface but as propagation spaces with the specific boundaries such as a waveguide which shows SSPP modes. If the thickness is so small that it is negligible, Babinet's principle is still valid, while it has been uncertain how the layer thickness works to break the principle as it is increased. The unconfirmed transformation is revealed analytically and experimentally with the use of MpAs and MHAs of varying thicknesses. The behavior of electromagnetic waves interacting with objects is broadly classified into two cases. For wavelengths significantly larger than the object, the wave's electric fields are treated as near fields and electromagnetic behavior is expressed as a scattering phenomenon. For wavelengths much smaller than the object the wave's electric fields are treated as far fields and the electromagnetic behavior is expressed as propagating waves, either transmitted or reflected. However, when the wavelength is of the same order as the object size, the scattering phenomena become more complex. In this case, if such objects are perforated periodically, they can be provided an interesting medium with properties, otherwise not attainable with naturally occurring materials, such as a negative refractive index (NRI) 1-6. In general, these artificial structures are called metamaterials. In 2000, Pendry showed theoretically the concept of a perfect lens with a negative refractive index (NRI) medium 1 , and in 2001, Shelby et al. verified the possibility of an NRI experimentally by using the two artificial resonators for negative permeability and permittivity media 2. Their studies demonstrated the feasibility of metamaterials, and accelerated the advances in the field in recent years 1-3, 7-12. In such studies, a split ring resonator (SRR) is often used as a negative permeability medium for NRI realization. And the complementary split ring resonator (CSRR) is also known as the resonator for negative permittivity realization, based on Babinet's principle 12-16. In these two resonators, the essential difference in their resonance is based on the following electromagnetic radiation mechanisms: SRR radiates the topologically overlaid waves from the infinitesimal electric dipoles, and CSRR radiates them from the infinitesimal magnetic dipoles. Based on this principle, the SRR and CSRR show band-stop and band-pass characteristics if they are used as planar spatial filters. A frequency selective surface (FSS) is also a spatial f...

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Duality of Spoof Surface Plasmon Polaritons on the Complementary Structures of Ultrathin Metal Films

Cited by 7 publications

References 35 publications

Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides

Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides

Wireless Experimental Determination of Dispersion Curves of Spoof Surface Plasmon Polariton Modes Supported by a Transmission Line

Analysis and observation of the breakdown of Babinet’s principle in complementary spoof surface plasmon polariton structures

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