Plasmonic Breathing and Edge Modes in Aluminum Nanotriangles

Campos, Alfredo; Arbouet, Arnaud; Martin, Jérôme; Gérard, Davy; Proust, Julien; Plain, Jérôme; Kociak, Mathieu

doi:10.1021/acsphotonics.7b00204

Cited by 76 publications

(80 citation statements)

References 31 publications

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“…This observation relates to our assumption of an equal radiative damping for these high order planar resonances. These computed spatial distributions are in excellent agreement with the ones described as edge (from light blue to pink) and breathing eigenmodes (dark red and dark green) in similar prismatic geometries . The experimental peak decomposition provides an in‐depth description of the set of plasmonic resonances sustained by the platelets.…”

Section: Resultssupporting

confidence: 75%

“…These data are gathered in Figure a,b where a similar trend is observed for all the resonances in both fitted and computed spectra. The resonances are associated to Fabry–Perot behavior of the plasmonic cavity . A possible improvement of our approach would be the extraction of the wavevectors ( k ) associated to the plasmon resonances in the SP‐LDOS maps, and their subsequent dispersion relation ( k (ω)).…”

Section: Resultsmentioning

confidence: 99%

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Spectral Tuning of High Order Plasmonic Resonances in Multimodal Film‐Coupled Crystalline Cavities

Kumar

Cuche

Sharma

et al. 2019

Advanced Optical Materials

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allow for a strong confinement and enhancement of the electromagnetic field in subwavelength volumes along with plasmon propagation in structures with low dimensionalities. [2] These appealing properties have triggered the development of biosensing, [3] energy conversion, [4,5] detectors, [6] integrated optical component for information transfer and/or processing, [7] or shaping of the phase front of light. [8,9] Several applications rely on the ability of the plasmonic nanoparticle to efficiently scatter or concentrate the light in a specific region of space at a given energy. As a consequence, a constant effort has been undertaken to control and tune the plasmon resonance of subwavelength plasmonic resonators or antennas from UV to IR. [10,11] Strategies to adjust the conditions of resonance or propagation rely on the static [12,13] or dynamic [14][15][16] modification of the surrounding medium, on the modification of the geometry, [17] the size or the material of the metallic object itself, [12,18,19] or on the modification of the charge carrier density, for instance. [20] A particularly efficient approach exploits the electromagnetic coupling between a plasmonic nanoparticle and a thin metallic film. [21][22][23][24][25][26] The small nanocavity resulting from the metalinsulator-metal (MIM) geometry gives rise to new longitudinal and transverse plasmonic resonances in the gap along with a spectral shift of the native resonance of the nanoparticle. [27][28][29] The adjustment of the coupling strength by varying the distance between nanoparticles and the conductive plasmonic film can be used to tune the surface plasmon (SP) resonance wavelength. [30][31][32] The MIM geometry, which is compatible with operational device configuration, offers therefore a new degree of freedom to control the modal plasmonic landscape and the related scattering properties of the system.While the optical response of subwavelength particles is well defined and usually limited to one or two resonances in the visible, sub-micronic 2D colloidal gold cavities sustain multiple higher order plasmonic resonances that offer a much richer multimodal plasmonic spectrum. Indeed, these highly crystalline and thin metallic cavities exhibit a single transverse mode but several planar resonances of higher order than the dipolar one in the visible and near-infrared. [33][34][35][36] They result from multiple interferences between degenerated high order SP modes and yield optical near-fields that are strongly localized at specific hot spots along the edges and at the center of the Sub-micrometric and ultrathin gold cavities sustain several high order planar plasmon resonances in the visible to near-infrared spectral window that open new perspectives for the realization of self-assembled metasurfaces or integrated components for nano-optics. This article investigates in detail the far-field spectral features of these multimodal crystalline gold nanoprisms, deposited on either dielectric (glass) or metallic substrates (Au, Al) by darkfield scattering s...

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Spectral Tuning of High Order Plasmonic Resonances in Multimodal Film‐Coupled Crystalline Cavities

Kumar

Cuche

Sharma

et al. 2019

Advanced Optical Materials

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“…Among these methods are lithography, laser ablation and chemical synthesis. This includes nanorods [28][29][30], nanodisks [22] or flat triangles [31,32]. The main disadvantage is its inherent high tendency to oxidation.…”

Section: Aluminummentioning

confidence: 99%

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

et al. 2018

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Ultraviolet plasmonics (UV) has become an active topic of research due to the new challenges arising in fields such as biosensing, chemistry or spectroscopy. Recent studies have pointed out aluminum, gallium, magnesium and rhodium as promising candidates for plasmonics in the UV range. Aluminum and magnesium present a high oxidation tendency that has a critical effect in their plasmonic performance. Nevertheless, gallium and rhodium have drawn a lot of attention because of their low tendency of oxidation and, at the same time, good plasmonic response in the UV and excellent photocatalytic properties. Here, we present a short overview of the current state of UV plasmonics with the latest findings in the plasmonic response and applications of aluminum, gallium, magnesium and rhodium nanoparticles.

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“…All of our conclusions can be extended to higher order modes e.g., edge modes 32 or breathing modes. 33,34 Considering the FWHM of the dipolar modes, we observed 0.16 eV in vacuum (theory), 0.30 eV for h-BN, 0.32 eV for Si 3 N 4 , and 0.43 eV for FLG. Our experiments were performed with an electron beam with an energy spread of about 0.26 eV (0.15 eV after deconvolution).…”

mentioning

confidence: 78%

Monolayer and thin h–BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles

Tizei

Lourenço-Martins

Das

et al. 2018

Applied Physics Letters

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The influence of four substrates [thin Si3N4, few-layer graphene (FLG), thin h–BN, and monolayer h–BN] on plasmon resonances of metallic nanoparticles was studied using electron energy loss spectroscopy. The h–BN monolayer is an excellent substrate for the study of plasmonic particles due to its large bandgap, negligible charging under electron irradiation, and negligible influence on the plasmon resonance full width at half maximum and peak positions. These effects were evidenced in experiments with gold nanotriangles focusing on dipolar modes. Nanotriangles on h–BN exhibit the lowest influence from the substrate compared to Si3N4 and FLG. In a dataset containing 23 triangles of similar sizes, the dipolar mode was found to have smaller redshifts, sharper peak widths, and higher resonance quality factors on h–BN, showing that it has nearly no effect on the plasmon absorption properties, provided that it is free from carbon contamination. However, light emission (cathodoluminescence) decreases as a function of electron irradiation for triangles on h–BN, even though the electron energy loss signal stays unchanged. This indicates the creation of non-radiative decay channels.

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Plasmonic Breathing and Edge Modes in Aluminum Nanotriangles

Cited by 76 publications

References 31 publications

Spectral Tuning of High Order Plasmonic Resonances in Multimodal Film‐Coupled Crystalline Cavities

Spectral Tuning of High Order Plasmonic Resonances in Multimodal Film‐Coupled Crystalline Cavities

Plasmonics in the Ultraviolet with Aluminum, Gallium, Magnesium and Rhodium

Monolayer and thin h–BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles

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