Plasmonic Dispersion Relations and Intensity Enhancement of Metal–Insulator–Metal Nanodisks

Schaffernak, Gernot; Krug, Markus; Belitsch, Martin; Gašparić, Marija; Ditlbacher, Harald; Hohenester, Ulrich; Krenn, Joachim R.; Hohenau, Andreas

doi:10.1021/acsphotonics.8b00938

Cited by 27 publications

(14 citation statements)

References 24 publications

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“…However, these higher order modes are observed in the elliptical region, and in addition to a HMM [55] can also be supported by a simpler multilayer, such as a metaldielectric-metal system. [56] As expected, the energies of the localized plasmon modes decrease for increasing pillar diameter. The near-field simulations show a set of dipolar, quadrupolar and hexapolar modes that are similar to the resonances seen in metal nanodisks.…”

Section: Discussionsupporting

confidence: 72%

Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures

Isoniemi

Maccaferri

Ramasse

et al. 2020

Advanced Optical Materials

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Layered metal/dielectric hyperbolic metamaterials (HMMs) support a wide landscape of plasmon polariton excitations. In addition to surface plasmon polaritons, coupled Bloch-like gap-plasmon polaritons with high modal confinement inside the multilayer are supported.Photons can excite only a subset of these polaritonic modes, typically with a limited energy and momentum range in respect to the wide set of high-K modes supported by hyperbolic dispersion media, and coupling with gratings or local excitation is necessary. Strikingly, electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope allows nm-scale local excitation and mapping of the spatial field distribution of all the modes supported by a photonic or plasmonic structure, both bright and dark, and also all other inelastic interactions of the beam, including phonons and interband transitions. Herein, experimental evidence of the spatial distribution of plasmon polaritons in multilayered type II 2 HMM nanostructures is acquired with an aloof electron beam adjacent to structures of current interest. HMM pillars are useful for their separation and adjustability of optical scattering and absorption, while HMM slot cavities can be used as waveguides with high field confinement.The nature of the modes is confirmed with corresponding simulations of EEL and optical spectra and near-field intensities.

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Section: Discussionsupporting

confidence: 72%

Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures

Isoniemi

Maccaferri

Ramasse

et al. 2020

Advanced Optical Materials

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“…Planar photonic nanocavities made of metal-insulator-metal (MIM) layers constitute a versatile platform for engineering nanocavities with strong light confinement in a broad frequency range [1,6,[14][15][16][17][18][19][20][21][22][23][24][25][26], and the possibility of fabricating vertically stacked systems allows for the design of coupled resonators [8]. Furthermore, their ease in fabrication, together with the broad variety of employable materials, makes MIM cavities an ideal system for the exploration of nonlinear optical properties [11,27,28].…”

Section: Introductionmentioning

confidence: 99%

Hybridization of epsilon-near-zero modes via resonant tunneling in layered metal-insulator double nanocavities

et al. 2019

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The coupling between multiple nanocavities in close vicinity leads to the hybridization of their modes. Stacked metal-insulator-metal (MIM) nanocavities constitute a highly versatile and very interesting model system to study and engineer such mode coupling, as they can be realized by lithography-free fabrication methods with fine control on the optical and geometrical parameters. The resonant modes of such MIM cavities are epsilon-near-zero (ENZ) resonances, which are appealing for nonlinear photophysics and a variety of applications. Here, we study the hybridization of ENZ resonances in MIMIM nanocavities, obtaining a very large mode splitting reaching 0.477 eV, Q-factors of the order of 40 in the visible spectral range, and fine control on the resonance wavelength and mode linewidth by tuning the thickness of the dielectric and metallic layers. A semiclassical approach that analyzes the MIMIM structure as a double quantum well system allows to derive the exact analytical dispersion relation of the ENZ resonances, achieving perfect agreement with numerical simulations and experiments. Interestingly, the asymmetry of the mode splitting in a symmetric MIMIM cavity is not reflected in the classical model of coupled oscillators, which can be directly related to quantum mechanical tunneling for the coupling of the two cavities. Interpreting the cavity resonances as resonant tunneling modes elucidates that they can be excited without momentum matching techniques. The broad tunability of high-quality ENZ resonances together with their strong coupling efficiency makes such MIMIM cavities an ideal platform for exploring light-matter interaction, for example, by the integration of quantum emitters in dielectric layers.

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“…We mentioned at the beginning of this article that there is an alternative approach to artificially achieve magnetic effects by using nanostructured meta-molecules. The simplest structure to generate magnetic modes is the metal-insulator-metal (MIM) structure [173][174][175], where the excitation of gap plasmons induce strong magnetic resonances [176]. [191].…”

Section: Artificial Optical-magnetism In Coupled Plasmonic Metamaterialsmentioning

confidence: 99%

Coupling phenomena and collective effects in resonant meta-atoms supporting both plasmonic and (opto-)magnetic functionalities: an overview on properties and applications [Invited]

Maccaferri¹

2019

J. Opt. Soc. Am. B

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We review both the fundamental aspects and the applications of functional magneto-optic and opto-magnetic metamaterials displaying collective and coupling effects on the nanoscale, where the concepts of optics and magnetism merge to produce unconventional phenomena. The use of magnetic materials instead of the usual noble metals allows for an additional degree of freedom for the control of electromagnetic field properties, as well as it allows light to interact with the spins of the electrons and to actively manipulate the magnetic properties of such nanomaterials. In this context, we explore the concepts of near-field coupling of plasmon modes in magnetic meta-molecules, as well as the effect of excitation of surface lattice resonances in magneto-plasmonic crystals. Moreover, we discuss how these coupling effects can be exploited to artificially enhance optical magnetism in plasmonic meta-molecules and crystals. Finally, we highlight some of the present challenges and provide a perspective on future directions of the research towards photon-driven fast and efficient nanotechnologies bridging magnetism and optics beyond current limits.

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Plasmonic Dispersion Relations and Intensity Enhancement of Metal–Insulator–Metal Nanodisks

Cited by 27 publications

References 24 publications

Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures

Electron Energy Loss Spectroscopy of Bright and Dark Modes in Hyperbolic Metamaterial Nanostructures

Hybridization of epsilon-near-zero modes via resonant tunneling in layered metal-insulator double nanocavities

Coupling phenomena and collective effects in resonant meta-atoms supporting both plasmonic and (opto-)magnetic functionalities: an overview on properties and applications [Invited]

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