Journal
OPTICA
Volume 5, Issue 3, Pages 289-294Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPTICA.5.000289
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Funding
- National Science Foundation (NSF) [ECCS-1549851, ECCS-1606898, IIP-1444922]
- Texas Instruments Distinguished University Chair in Nanoelectronics Endowment
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1549851] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1606898] Funding Source: National Science Foundation
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Metamaterials are important, as they possess properties not found in simple materials. Photonic device technology applying metamaterials supports many new and useful applications. Here, we address the fundamental physics of wideband metamaterial reflectors. We show that these devices operate because of resonant leaky Bloch modes propagating in the periodic lattice. Moreover, in contrast to published literature, we demonstrate that Mie scattering in individual array particles is not a causal effect. In particular, by connecting the constituent particles by a matched sublayer and thereby destroying the Mie cavity, we find that the resonance bandwidth actually expands even though localized Mie resonances have been extinguished. There is no abrupt change in the reflection characteristics on addition of a sublayer to any metamaterial array consisting of discrete particles. Thus, the physics of the discrete and connected arrays is the same. The resonant Bloch mode picture is supported by numerous additional examples and analyses presented herein. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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