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Title: Generalized metamaterials: Definitions and taxonomy
Authors: Kim, Noori
Yoon, Yong-Jin
Allen, Jont B.
Keywords: Metamaterials
Wave equations
Issue Date: 2016
Source: Kim, N., Yoon, Y.-J., & Allen, J. B. (2016). Generalized metamaterials: Definitions and taxonomy. Journal of the Acoustical Society of America, 139(6), 3412-3418.
Series/Report no.: Journal of the Acoustical Society of America
Abstract: This article reviews the development of metamaterials (MM), starting from Newton's discovery of the wave equation, and ends with a discussion of the need for a technical taxonomy (classification) of these materials, along with a better defined definition of metamaterials. It is intended to be a technical definition of metamaterials, based on a historical perspective. The evolution of MMs began with the discovery of the wave equation, traceable back to Newton's calculation of the speed of sound. The theory of sound evolved to include quasi-statics (Helmholtz) and the circuit equations of Kirchhoff's circuit laws, leading to the ultimate development of Maxwell's equations and the equation for the speed of light. Be it light, or sound, the speed of the wave-front travel defines the wavelength, and thus the quasi-static (QS) approximation. But there is much more at stake than QSs. Taxonomy requires a proper statement of the laws of physics, which includes at least the six basic network postulates: (P1) causality (non-causal/acausal), (P2) linearity (non-linear), (P3) real (complex) time response, (P4) passive (active), (P5) time-invariant (time varying), and (P6) reciprocal (non-reciprocal). These six postulates are extended to include MMs.
ISSN: 0001-4966
DOI: 10.1121/1.4950726
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2016 Acoustical Society of America. This paper was published in Journal of the Acoustical Society of America and is made available as an electronic reprint (preprint) with permission of Acoustical Society of America. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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