Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models
<p style="text-align:justify;"> Surface waves are responsible for many phenomena occurring in metamaterials and have been studied extensively. At the same time, the effects of inter-element coupling on surface electromagnetic waves (polaritons) remain poorly understood. Using two mo...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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AIP Publishing
2015
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| _version_ | 1797060843703107584 |
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| author | Hadjicosti, K Sydoruk, O Maier, SA Shamonina, E |
| author_facet | Hadjicosti, K Sydoruk, O Maier, SA Shamonina, E |
| author_sort | Hadjicosti, K |
| collection | OXFORD |
| description | <p style="text-align:justify;"> Surface waves are responsible for many phenomena occurring in metamaterials and have been studied extensively. At the same time, the effects of inter-element coupling on surface electromagnetic waves (polaritons) remain poorly understood. Using two models, one relying on the effective-medium approximation and the other on equivalent circuits, we studied theoretically surface polaritons propagating along an interface between air and a magnetic metamaterial. The metamaterial comprised split rings that could be uncoupled or coupled to each other in the longitudinal or transverse directions (along or perpendicular to the propagation direction). A metamaterial without inter-element coupling supported a single polariton. When a moderate longitudinal coupling was included, it changed the wave dispersion only quantitatively, and the results of the effective-medium and the circuit models were shown to agree at low wavenumbers. However, the presence of a transverse coupling changed the polariton dispersion dramatically. The effective-medium model yielded two branches of polariton dispersion at low values of the transverse coupling. As the coupling increased, both polaritons disappeared. The validity of the effective-medium model was further tested by employing the circuit model. In this model, surface polaritons could exist in the presence of a transverse coupling only if the boundary layer of the metamaterial included additional impedances, which could become non-Foster. The results reveal that the inter-element coupling is a major mechanism affecting the properties of the polaritons. They also highlight the limitations of using bulk effective-medium parameters for interface problems in metamaterials. I. INTRODUCTION </p> |
| first_indexed | 2024-03-06T20:22:39Z |
| format | Journal article |
| id | oxford-uuid:2e5c65b6-ee3f-469a-b447-71ee33940290 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:22:39Z |
| publishDate | 2015 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | oxford-uuid:2e5c65b6-ee3f-469a-b447-71ee339402902022-03-26T12:48:26ZSurface polaritons in magnetic metamaterials from perspective of effective-medium and circuit modelsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2e5c65b6-ee3f-469a-b447-71ee33940290EnglishSymplectic Elements at OxfordAIP Publishing2015Hadjicosti, KSydoruk, OMaier, SAShamonina, E <p style="text-align:justify;"> Surface waves are responsible for many phenomena occurring in metamaterials and have been studied extensively. At the same time, the effects of inter-element coupling on surface electromagnetic waves (polaritons) remain poorly understood. Using two models, one relying on the effective-medium approximation and the other on equivalent circuits, we studied theoretically surface polaritons propagating along an interface between air and a magnetic metamaterial. The metamaterial comprised split rings that could be uncoupled or coupled to each other in the longitudinal or transverse directions (along or perpendicular to the propagation direction). A metamaterial without inter-element coupling supported a single polariton. When a moderate longitudinal coupling was included, it changed the wave dispersion only quantitatively, and the results of the effective-medium and the circuit models were shown to agree at low wavenumbers. However, the presence of a transverse coupling changed the polariton dispersion dramatically. The effective-medium model yielded two branches of polariton dispersion at low values of the transverse coupling. As the coupling increased, both polaritons disappeared. The validity of the effective-medium model was further tested by employing the circuit model. In this model, surface polaritons could exist in the presence of a transverse coupling only if the boundary layer of the metamaterial included additional impedances, which could become non-Foster. The results reveal that the inter-element coupling is a major mechanism affecting the properties of the polaritons. They also highlight the limitations of using bulk effective-medium parameters for interface problems in metamaterials. I. INTRODUCTION </p> |
| spellingShingle | Hadjicosti, K Sydoruk, O Maier, SA Shamonina, E Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title | Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title_full | Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title_fullStr | Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title_full_unstemmed | Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title_short | Surface polaritons in magnetic metamaterials from perspective of effective-medium and circuit models |
| title_sort | surface polaritons in magnetic metamaterials from perspective of effective medium and circuit models |
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