Journal ArticleDOI
Magnetism from conductors and enhanced nonlinear phenomena
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In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.Abstract:
We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu//sub eff/, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of /spl mu//sub eff/. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a very low density of metal so that structures can be extremely lightweight. Most of the structures are resonant due to internal capacitance and inductance, and resonant enhancement combined with compression of electrical energy into a very small volume greatly enhances the energy density at critical locations in the structure, easily by factors of a million and possibly by much more. Weakly nonlinear materials placed at these critical locations will show greatly enhanced effects raising the possibility of manufacturing active structures whose properties can be switched at will between many states.read more
Citations
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Unique Retrieval of Complex Permittivity and Permeability of Dispersive Materials From Reflection and Transmitted Fields by Enforcing Causality
Vasundara V. Varadan,Ruyen Ro +1 more
TL;DR: In this article, the electromagnetic properties of general classes of materials can be obtained by inverting the measured or numerically simulated reflection (S 11) and transmission (S 21) coefficients through a known thickness of a planar slab of the material.
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Split-ring-resonator-coupled enhanced transmission through a single subwavelength aperture
Koray Aydin,Koray Aydin,A. Ozgur Cakmak,Levent Sahin,Zhaofeng Li,Filiberto Bilotti,Lucio Vegni,Ekmel Ozbay +7 more
TL;DR: The enhanced transmission of electromagnetic waves through a single subwavelength aperture by using a split-ring resonator (SRR) at microwave frequencies is reported and 740-fold transmission enhancement is obtained by exciting the electric resonance of SRR.
Journal ArticleDOI
Three‐Dimensionally Isotropic Negative Refractive Index Materials from Block Copolymer Self‐Assembled Chiral Gyroid Networks
Kahyun Hur,Yan Francescato,Vincenzo Giannini,Stefan A. Maier,Richard G. Hennig,Ulrich Wiesner +5 more
TL;DR: In this paper, the authors make clear theoretical predictions for how to design 3D isotropic materials with negative refraction and circularly polarized light propagation from a class of block copolymer based self-assembled materials not yet rigorously studied in the context of metamaterials.
Journal ArticleDOI
A d.c. magnetic metamaterial
Fridrik Magnus,B. Wood,J.J. Moore,Kelly Morrison,G. K. Perkins,J. Fyson,M. C. K. Wiltshire,David Caplin,Lesley F. Cohen,John B. Pendry +9 more
TL;DR: The first experimental realization of a non-resonant metamaterial designed to operate at zero frequency is presented, and the corresponding effective permeability is calculated, which agrees well with theoretical predictions.
Journal ArticleDOI
An SRR based microwave absorber
TL;DR: In this article, the authors presented the design of a resonant microwave absorber made by a proper array of split ring resonators (SRRs), and the physical mechanism behind the operation of the proposed component is based on the SRR resonance, arising when the structure is excited by a properly polarized impinging wave.
References
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