Role of surface electromagnetic waves in metamaterial absorbers

Metamaterial absorbers have been demonstrated across much of the electromagnetic spectrum and exhibit both broad and narrow-band absorption for normally incident radiation. Absorption diminishes for increasing angles of incidence and transverse electric polarization falls off much more rapidly than...

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Bibliographic Details
Published in:Optics express Vol. 24; no. 6; pp. 6783 - 6792
Main Authors: Chen, Wen-Chen, Cardin, Andrew, Koirala, Machhindra, Liu, Xianliang, Tyler, Talmage, West, Kevin G, Bingham, Christopher M, Starr, Tatiana, Starr, Anthony F, Jokerst, Nan M, Padilla, Willie J
Format: Journal Article
Language:English
Published: United States Optical Society of America (OSA) 21-03-2016
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Summary:Metamaterial absorbers have been demonstrated across much of the electromagnetic spectrum and exhibit both broad and narrow-band absorption for normally incident radiation. Absorption diminishes for increasing angles of incidence and transverse electric polarization falls off much more rapidly than transverse magnetic. We unambiguously demonstrate that broad-angle TM behavior cannot be associated with periodicity, but rather is due to coupling with a surface electromagnetic mode that is both supported by, and well described via the effective optical constants of the metamaterial where we achieve a resonant wavelength that is 19.1 times larger than the unit cell. Experimental results are supported by simulations and we highlight the potential to modify the angular response of absorbers by tailoring the surface wave.
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USDOE Office of Science (SC)
SC0005240
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.006783