Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies
We elucidate the role of the mode coupling of the Mie resonances in all-dielectric metamaterials to ensure a negative effective index at terahertz frequencies. We perform a study as a function of the lattice period and of the frequency overlapping of the modes of resonance. We show that negative eff...
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EDP Sciences
2018-01-01
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doaj-ac7012bc20b842639547a99dc6c65ae12021-04-02T12:47:38ZengEDP SciencesEPJ Applied Metamaterials2272-23942018-01-0151010.1051/epjam/2018006epjam180003Negative index and mode coupling in all-dielectric metamaterials at terahertz frequenciesAkmansoy Erichttps://orcid.org/0000-0002-5571-329XMarcellin SimonWe elucidate the role of the mode coupling of the Mie resonances in all-dielectric metamaterials to ensure a negative effective index at terahertz frequencies. We perform a study as a function of the lattice period and of the frequency overlapping of the modes of resonance. We show that negative effective refractive index requires sufficiently strong mode coupling and that for even more strong mode coupling, the first two modes of Mie resonances are degenerate; the effective refractive index is then undetermined. We also show that it is possible to obtain near-zero, or even null, effective index with a judicious adjustment of the mode coupling. Further, we discuss the mode coupling effect with hybridization in metamaterials.https://epjam.edp-open.org/articles/epjam/full_html/2018/01/epjam180003/epjam180003.htmlall-dielectric metamaterialsnegative indexmode couplingnear-zero refractive index |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Akmansoy Eric Marcellin Simon |
spellingShingle |
Akmansoy Eric Marcellin Simon Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies EPJ Applied Metamaterials all-dielectric metamaterials negative index mode coupling near-zero refractive index |
author_facet |
Akmansoy Eric Marcellin Simon |
author_sort |
Akmansoy Eric |
title |
Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
title_short |
Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
title_full |
Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
title_fullStr |
Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
title_full_unstemmed |
Negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
title_sort |
negative index and mode coupling in all-dielectric metamaterials at terahertz frequencies |
publisher |
EDP Sciences |
series |
EPJ Applied Metamaterials |
issn |
2272-2394 |
publishDate |
2018-01-01 |
description |
We elucidate the role of the mode coupling of the Mie resonances in all-dielectric metamaterials to ensure a negative effective index at terahertz frequencies. We perform a study as a function of the lattice period and of the frequency overlapping of the modes of resonance. We show that negative effective refractive index requires sufficiently strong mode coupling and that for even more strong mode coupling, the first two modes of Mie resonances are degenerate; the effective refractive index is then undetermined. We also show that it is possible to obtain near-zero, or even null, effective index with a judicious adjustment of the mode coupling. Further, we discuss the mode coupling effect with hybridization in metamaterials. |
topic |
all-dielectric metamaterials negative index mode coupling near-zero refractive index |
url |
https://epjam.edp-open.org/articles/epjam/full_html/2018/01/epjam180003/epjam180003.html |
work_keys_str_mv |
AT akmansoyeric negativeindexandmodecouplinginalldielectricmetamaterialsatterahertzfrequencies AT marcellinsimon negativeindexandmodecouplinginalldielectricmetamaterialsatterahertzfrequencies |
_version_ |
1721567673559547904 |