Article (Scientific journals)
Hyperbolic Meta-Antennas Enable Full Control of Scattering and Absorption of Light
Maccaferri, Nicolò; Zhao, Yingqi; Isoniemi, Tommi et al.
2019In Nano Letters, 19 (3), p. 1851-1859
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Keywords :
absorption; scattering; plasmonic nanostructures; nanoantennas; Hyperbolic metamaterials; hybrid nanostructures
Abstract :
[en] We introduce a novel concept of hybrid metal-dielectric meta-antenna supporting type II hyperbolic dispersion, which enables full control of absorption and scattering of light in the visible/near-infrared spectral range. This ability lies in the different nature of the localized hyperbolic Bloch-like modes excited within the meta-antenna. The experimental evidence is corroborated by a comprehensive theoretical study. In particular, we demonstrate that two main modes, one radiative and one non-radiative, can be excited by direct coupling with the free-space radiation. We show that the scattering is the dominating electromagnetic decay channel, when an electric dipolar mode is induced in the system, whereas a strong absorption process occurs when a magnetic dipole is excited. Also, by varying the geometry of the system, the relative ratio of scattering and absorption, as well as their relative enhancement and/or quenching, can be tuned at will over a broad spectral range, thus enabling full control of the two channels. Importantly, both radiative and nonradiative modes supported by our architecture can be excited directly with far-field radiation. This is observed to occur even when the radiative channels (scattering) are almost totally suppressed, thereby making the proposed architecture suitable for practical applications. Finally, the hyperbolic meta-antennas possess both angular and polarization independent structural integrity, unlocking promising applications as hybrid meta-surfaces or as solvable nanostructures.
Disciplines :
Physics
Author, co-author :
Maccaferri, Nicolò  ;  Istituto Italiano di Tecnologia ; University of Luxembourg
Zhao, Yingqi 
Isoniemi, Tommi
Iarossi, Marzia
Parracino, Antonietta
Strangi, Giuseppe
De Angelis, Francesco
 These authors have contributed equally to this work.
External co-authors :
yes
Language :
English
Title :
Hyperbolic Meta-Antennas Enable Full Control of Scattering and Absorption of Light
Publication date :
2019
Journal title :
Nano Letters
ISSN :
1530-6992
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
19
Issue :
3
Pages :
1851-1859
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 27 February 2019

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