TM-polarized surface-plasma modes on metal-coated dielectric cylinders

Al-Bader, S.J.; Imtaar, M.

doi:10.1109/50.144906

Cited by 17 publications

(11 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The analysis of the natural modes supported by ENG (plasma) cylinders or cylindrical shells has been carried out in different papers (see, e.g., [23]- [26]), although mainly focused on surface wave propagation. An analogous analysis is applied here for the supported leaky-waves.…”

Section: Leaky-wave Dispersionmentioning

confidence: 99%

Theory and Simulations of a Conformal Omni- Directional Subwavelength Metamaterial Leaky-Wave Antenna

Alù

Bilotti²,

Engheta

et al. 2007

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

The detailed theory of a single subwavelength conformal radiator that exploits the resonant properties of thin cylindrical metamaterial shells supporting leaky waves is presented. It is shown and reviewed analytically and numerically how a circularly symmetric resonant leaky mode may be supported by a properly designed subwavelength homogenous cylindrical shell of low negative permittivity. Some physical insights are provided and numerical simulations with a feed point, considering also the finiteness of the antenna in the longitudinal direction, are presented and discussed. Moreover, possibilities and limitations of a practical realization of this setup are mentioned, considering in details the possible anisotropies in the metamaterials. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Pennsylvania's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. Abstract-The detailed theory of a single subwavelength conformal radiator that exploits the resonant properties of thin cylindrical metamaterial shells supporting leaky waves is presented. It is shown and reviewed analytically and numerically how a circularly symmetric resonant leaky mode may be supported by a properly designed subwavelength homogenous cylindrical shell of low negative permittivity. Some physical insights are provided and numerical simulations with a feed point, considering also the finiteness of the antenna in the longitudinal direction, are presented and discussed. Moreover, possibilities and limitations of a practical realization of this setup are mentioned, considering in details the possible anisotropies in the metamaterials.

show abstract

Section: Leaky-wave Dispersionmentioning

confidence: 99%

Theory and Simulations of a Conformal Omni- Directional Subwavelength Metamaterial Leaky-Wave Antenna

Alù

Bilotti²,

Engheta

et al. 2007

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

show abstract

“…The corresponding nonzero wave components, H , E r , and E z , obey the following relations [3]: where is the optical angular frequency, 0 is the vacuum permeability, 0 and are the permittivities of the vacuum and the medium respectively. For the analysis of TM waves, the inverse permittivity of the grating layer, 1/ , is used [4].For the CCMG waveguide under infinite length approximation, the solutions of (2) will be restricted to the 1 st -and 2 nd -type Hankel functions.…”

Section: A Equationsmentioning

confidence: 99%

Design and analysis of terahertz surface-emitting distributed-feedback lasers with circular metal grating

2010

2010 3rd International Nanoelectronics Conference (INEC)

View full text Add to dashboard Cite

Circular surface-emitting quantum-cascade lasers (QCLs) are good candidate to provide high-power low-divergent single-mode terahertz (THz) waves. These devices employ the metallic cladding layer and 2 nd -order circular metal grating to provide surface-coupling mechanism and ultra-high light confinement to improve the lasing efficiency. Under such a big index contrast in metal grating, high-order diffracted waves cannot be overlooked, leading to dramatic change of the transverse modal distribution with the variation of grating duty cycle. Therefore, the conventional coupled-wave technique used for small-index contrast grating becomes inapplicable for this investigation. To solve this problem, we express the field distribution as a Floquet-Bloch expansion of Hankel functions to take into account the high-order diffraction waves. First, the coupled-wave equations of transverse-magnetic mode are derived under the infinite-length approximation. The detailed transversemode characteristics of symmetric and anti-symmetric modes supported in the circular waveguide as well as the effects of device parameters are analyzed. Based on the results of infinite-length assumption, the coupled-mode equations of finite-length device are then derived, which allows us to investigate the threshold and modal characteristics of the considered THz surface-emitting circular QCLs. It is observed that the proposed structure has the potential to realize vertical THz radiation with beam quality of subwavelength dimension.

show abstract

“…O comportamento do ηefr e ηefi para espessura da cobertura extra (η3) de 0,01 a 2,44, são vistos nos gráficos 1.a e 1.b, enquanto que os de h superiores a 4, são mostrados nos gráficos 1c e 1d. Estes resultados são semelhantes aos encontrados na análise das estruturas convencionais de três regiões [4,7]. O que caracteriza a não influência da cobertura extra sobre os referidos modos.…”

Section: B Cálculo Das Componentes Dos Campos Eletromagnéticos Tangenciais As Fronteirasunclassified

“…No metal, os elétrons acoplados ao campo eletromagnético incidente oscilam dissipando energia por efeito Joule. Portanto, o modelo eletromagnético dos metais, sob a ação de ondas harmônicas da forma ( e +jwt ) é caracterizado pela permissividade: Є m = -Є 0 (Є mr + j Є mi ) [1,2,3,4] Neste artigo, são estudados os modos de Plasmon nas superfícies de um filme condutor (Є m ) de espessura (d) depositado sobre fibras ópticas fracamente guiadas (η 1 ) de raio (a). O filme condutor é recoberto por uma região dielétrica extra (η 3 ) de espessura (h) que por sua vez faz fronteira com a cobertura (η 4 ) infinita, como mostra a Figura.-1.…”

unclassified

Influência da Cobertura Dielétrica Extra no Comportamento dos Modos de Plasmon em Fibras Fracamente Guiadas.

Sapienza¹,

Costa²

2009

Anais Do XXVII Simpósio Brasileiro De Telecomunicações

View full text Add to dashboard Cite

Resumo -Neste artigo, são analisados os modos de Plasmon em fibras ópticas fracamente guiadas em estruturas com quatro regiões. A análise com a região extra dielétrica, sobre o filme metálico, foi essencial para se compreender o comportamento dos quatro modos de Plasmon; os ligados simétrico (Sb) e assimétrico (ab); fuga pelo núcleo (ln) e fuga pela cobertura (lc). Os modos de Plasmon são, fundamentados no modo TM01. A estrutura analisada é constituída por um filme metálico (Єm), rodeado pelo núcleo (η1), e pela cobertura (η4). Entre a cobertura e o filme metálico é depositado um dielétrico extra (η3). São calculadas as curvas de dispersão dos diferentes modos, em função do raio interno da fibra, espessura do filme condutor e da largura da cobertura extra. O método adotado, neste atigo, é validado comparando-se os resultados encontrados, com os do método convencional aplicado a uma estrutura constituida por três regiões.Palavras chave -Modos de Plasmon, modo TM01, equação de Helmholtz cilíndrico-circular, índice efetivo dos respectivos modos, condições de fronteiras entre duas regiões.

show abstract

TM-polarized surface-plasma modes on metal-coated dielectric cylinders

Cited by 17 publications

References 15 publications

Theory and Simulations of a Conformal Omni- Directional Subwavelength Metamaterial Leaky-Wave Antenna

Theory and Simulations of a Conformal Omni- Directional Subwavelength Metamaterial Leaky-Wave Antenna

Design and analysis of terahertz surface-emitting distributed-feedback lasers with circular metal grating

Influência da Cobertura Dielétrica Extra no Comportamento dos Modos de Plasmon em Fibras Fracamente Guiadas.

Contact Info

Product

Resources

About