Article (Scientific journals)
Designer Bloch plasmon polariton dispersion in grating-coupled hyperbolic metamaterials
Maccaferri, Nicolò; Isoniemi, Tommi; Hinczewski, Michael et al.
2020In APL Photonics, 5, p. 076109
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Abstract :
[en] Hyperbolic metamaterials (HMMs) are anisotropic optical materials supporting highly confined propagating electromagnetic modes. How- ever, it is challenging to tailor and excite these modes at optical frequencies by prism coupling because of the unavailability of high refractive index prisms for matching the momentum between the incident light and the guided modes. Here, we report on the mechanism of excitation of high-index Bloch plasmon polariton modes with sub-diffraction spatial confinement using a meta-grating, which is a combined structure of a metallic diffraction grating and a type II HMM. We show how a one-dimensional plasmonic grating without any mode in the infrared spectral range, if coupled to an HMM supporting high-index modes, can efficiently enable the excitation of these modes via coupling to far- field radiation. Our theoretical predictions are confirmed by experimental reflection measurements as a function of angle of incidence and excitation wavelength. We introduce design principles to achieve a full control of high-index modes in meta-gratings, thus enabling a better understanding of light–matter interaction in this type of hybrid structure. The exploitation of the spectral response of these modes can find applications in bio-chemical sensing, integrated optics, and optical sub-wavelength imaging.
Disciplines :
Physics
Author, co-author :
Maccaferri, Nicolò ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Isoniemi, Tommi
Hinczewski, Michael
Iarossi, Marzia
Strangi, Giuseppe
De Angelis, Francesco
External co-authors :
yes
Language :
English
Title :
Designer Bloch plasmon polariton dispersion in grating-coupled hyperbolic metamaterials
Publication date :
2020
Journal title :
APL Photonics
ISSN :
2378-0967
Publisher :
AIP Publishing LLC, United States
Volume :
5
Pages :
076109
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
Available on ORBilu :
since 03 July 2020

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