Generalized approach to determine the plasma frequency for wire media: Useful for metamaterial applications
01 Dec 2011-pp 1-3
About: This article is published in IEEE Applied Electromagnetics Conference.The article was published on 2011-12-01. It has received 3 citations till now. The article focuses on the topics: Metamaterial absorber & Metamaterial antenna.
Citations
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TL;DR: In this article, a generalized analytical approach based on quasi-static analysis has been done and compared with previously reported results to determine the plasma frequency of wire media, and the results of different techniques are compared to establish the efficacy of the loss-factor method supported by experimental results.
Abstract: Analytical, simulation and experiment based technique has been reported in this paper to determine the plasma frequency of artificial media formed by arrays of parallel conducting wires called wire media. A generalized analytical approach based on quasi-static analysis has been done and compared with previously reported results to determine the plasma frequency of wire media. An eigenmode solver based simulation method has been used for plasma frequency extraction of infinite wire array using a commercial finite element method (FEM) based electromagnetic solver. The limitations of scattering-parameter based technique has been discussed and a new loss-factor method has been proposed. On the basis of simulated data, wire array has been fabricated and experiments has been carried out at X-band (8.2–12.4 GHz). Loss-factor method has been validated using the experimental data. Finally, the results of different techniques are compared to establish the efficacy of the loss-factor method supported by experimental results.
3 citations
01 Jan 2013
TL;DR: In this article, the formation of giant electric field at electrostatic resonance, which is primary cause of localized discharge thus plasmoid illumination, is observed in microwave drilling experiments, and the microwave radiation is applied via co-axial applicator, the monopole antenna; and the near field of the radiation causes local hot spots and thereby thermal runaway causing ejection of small particles from the base substrate.
Abstract: In this paper electrodynamics of plasmoid lighting is explained, which we are generating via creation of localized hot spot by application of microwave energy. The microwave radiation is applied via co-axial applicator, the monopole antenna; and the ‘near field’ of the radiation causes local hot spots and thereby thermal runaway causing ejection of small particles from the base substrate. These particles interact with the Electromagnetic field, and due to electrostatic resonances occurring from negative dielectric permittivity (thereby imaginary refractive index) of these small particles, giant electromagnetic energy fields are locally accumulated; making local discharge thus giving illuminated plasmoid ball. This paper explains the formation of giant electric field at electrostatic resonance, which is primary cause of localized discharge thus plasmoid illumination, is observed in microwave drilling experiments.
3 citations
01 Jan 2012
TL;DR: In this paper, a detailed write-up reviews very nature of negative refraction vis-a-vis existing physical thoughts, with mathematical and possible physical explanations via thought experiment; elaborating concepts of 'backward wave', 'hidden momentum', 'negative root', and several counterintuitive topics.
Abstract: This detailed write-up reviews very nature of negative refraction vis-a-vis existing physical thoughts. Why this project is called as "Left Handed Maxwell Systems" is due to counterintuitive nature of the cross product we need to take in the Maxwell equations, to satisfy that wave vector as opposite to the Poynting vector when the dielectric permittivity and magnetic permeability are both negatives; that is giving us a media of refractive index negative. This detailed note explains these phenomena, with mathematical and possible physical explanations via thought experiment; elaborating concepts of 'backward wave', 'hidden momentum', 'negative root', and several counterintuitive topics. Though several approaches to explain these counterintuitive phenomena have been evolving, yet it is interesting if in the meta-material parlance particle-wave theory be founded! Here we give possible classical explanations to these counterintuitive phenomena and also a new explanation regarding (quantized) energy momentum, wave equation if applied to this negative indexed material: how shall they look, vis-a-vis positive indexed systems.
3 citations
References
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TL;DR: A mechanism for depression of the plasma frequency into the far infrared or even GHz band is proposed: Periodic structures built of very thin wires dilute the average concentration of electrons and considerably enhance the effective electron mass through self-inductance.
Abstract: The plasmon is a well established collective excitation of metals in the visible and near UV, but at much lower frequencies dissipation destroys all trace of the plasmon and typical Drude behavior sets in. We propose a mechanism for depression of the plasma frequency into the far infrared or even GHz band: Periodic structures built of very thin wires dilute the average concentration of electrons and considerably enhance the effective electron mass through self-inductance. Computations replicate the key features and confirm our analytic theory. The new structure has novel properties not observed before in the GHz band, including some possible impact on superconducting properties.
3,954 citations
TL;DR: In this article, a simple analytical model for the effective permittivity is derived from quasi-static considerations, which gives a formula for the permittivities in terms of the geometrical parameters and the frequency.
Abstract: In this Letter artificial media formed by dense arrays of parallel conducting wires are considered. A simple analytical model for the effective permittivity is derived from quasi-static considerations. The result gives a formula for the permittivity in terms of the geometrical parameters and the frequency. The analysis covers lossy and loaded wires as well. The phenomena that lead to negative permittivity values are discussed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 47–51, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10512
158 citations