Multipolar and dark-mode plasmon resonances on drilled silver nano-triangles

Fletcher, Glen; Arnold, Matthew D.; Pedersen, Therese; Keast, V. J.; Cortie, Michael B.

doi:10.1364/oe.23.018002

Cited by 26 publications

(15 citation statements)

References 41 publications

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“…At the same time, the efficient confinement of the electric field inside the disk, as observed in Figure 3c, maximizes WE. We note that contrary to the case of plasmonics, where the concept of dark mode refers to a resonance with null net dipole moment that cannot be easily excited by a planar incident wave due to symmetry reasons [34,35], the dark AM can be efficiently excited by a plane wave, 7 as confirmed by simulations. We remark as well, that the corresponding magnetic field distribution for the germanium nanosystem (refer to section 4 in Supporting Information for simulations) also agrees with that reported for the AM [32], and has an associated magnetic energy calculated to be within the same order of magnitude as the electric one.…”

Section: Figure 1 Illustration Of the Thg Process For A 100 Nm-thickmentioning

confidence: 55%

Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode

et al. 2016

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ABSTRACT. We present an all-dielectric germanium nanosystem exhibiting a strong third order nonlinear response and efficient third harmonic generation in the optical regime. A thin germanium nanodisk shows a pronounced valley in its scattering cross section close to the dark anapole mode, while the electric field energy inside the disk is maximized due to high confinement within the dielectric. We investigate the dependence of the third harmonic signal on disk size and pump wavelength to reveal the nature of the anapole mode. Each germanium nanodisk generates a high effective third order susceptibility of (3) = 4.3 10 −9, corresponding to an associated third harmonic conversion efficiency of 0.0001% at a wavelength of 1650 nm, which is four orders of magnitude greater than the case of an unstructured germanium reference film. Furthermore, the nonlinear conversion via the anapole mode outperforms that via the radiative dipolar resonances by about one order of magnitude, which is consistent with our numerical simulations. These findings open new possibilities for the optimization of upconversion processes on the nanoscale through the appropriate engineering of suitable dielectric materials.

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Section: Figure 1 Illustration Of the Thg Process For A 100 Nm-thickmentioning

confidence: 55%

Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode

et al. 2016

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“…The long-wavelength peak has been assigned as the in-plane dipole peak, and the other peaks can, depending on direction of electric field and shape of the particle, be assigned as higher order in-plane peaks (quadrupole, octapole and decapole) or out-of-plane dipole and quadrupole excitations [21,25,26]. In-plane and out-of-plane refers to LSPRs excited by different polarization directions of the incident light relative to the plane of the triangular plate.…”

Section: Introductionmentioning

confidence: 99%

Higher Order Plasmonic Modes Excited in Ag Triangular Nanoplates by an Electron Beam

et al. 2015

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Ag triangular nanoplates are known to generate strong plasmonic resonances when excited by both light and electron beams. Experimental electron energy-loss spectra (EELS) and maps were acquired using an aberration-corrected JEOL-ARM microscope. The corner, edge and centre modes that are often observed in such structures were also observed in these measurements. In addition, novel higher order internal modes were observed and were found to be well reproduced by theoretical cal-culations using boundary element method (BEM). These modes are "dark modes" so are not observed in the optical extinction spectra. They are confined surface propagating modes and are analogous to laser cavity modes AbstractAg triangular nanoplates are known to generate strong plasmonic resonances when excited by both light and electron beams. Experimental electron energy-loss spectra (EELS) and maps were acquired using an aberration corrected JEOL-ARM microscope. The corner, edge and centre modes that are often observed in such structures were also observed in these measurements. In addition, novel higher order internal modes were observed and were found to be well-reproduced by theoretical calculations using boundary element method (BEM). These modes are "dark modes" so are not observed in the optical extinction spectra. They are confined surface propagating modes and are analogous to laser cavity modes.Keywords silver nanoparticles, localized surface plasmon resonance, electron energy-loss spectroscopy (EELS), boundary element method (BEM) Acknowledgements

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“…It is well accepted that breaking the symmetry of nanoscale assemblies gives rise to formation of new antibonding modes across the plasmonic response. 24,25 To underlay the physical mechanism behind the formation of antibonding resonant modes, the dipolar momentum of bonding and antibonding modes can be compared. In complex nanoparticle assemblies, and in the nonretarded limit, the plasmonic antibonding mode does not have any net dipole momentum and cannot be coupled to the incident beam efficiently.…”

Section: Calculations and Theorymentioning

confidence: 99%

“…On the other hand, in the retarded limit, antibonding mode becomes subradiant and bonding mode remains superradiant, therefore, any destructive interference between these modes gives rise to antisymmetric lineshapes on the extinction curve. [19][20][21][22][23][24][25] …”

Section: Calculations and Theorymentioning

confidence: 99%

Resonance coupling in plasmonic nanomatryoshka homo- and heterodimers

2016

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Here, we examine the electromagnetic (EM) energy coupling and hybridization of plasmon resonances between closely spaced concentric nanoshells known as “nanomatryoshka” (NM) units in symmetric and antisymmetric compositions using the Finite Difference Time Domain (FDTD) analysis. Utilizing plasmon hybridization model, we calculated the energy level diagrams and verified that, in the symmetric dimer (in-phase mode in a homodimer), plasmonic bonding modes are dominant and tunable within the considered bandwidth. In contrast, in the antisymmetric dimer (out-of-phase mode in a heterodimer), due to the lack of the geometrical symmetry, new antibonding modes appear in the extinction profile, and this condition gives rise to repeal of dipolar field coupling. We also studied the extinction spectra and positions of the antibonding and bonding modes excited due to the energy coupling between silver and gold NM units in a heterodimer structure. Our analysis suggest abnormal shifts in the higher energy modes. We propose a method to analyze the behavior of multilayer concentric nanoshell particles in an antisymmetric orientation employing full dielectric function calculations and the Drude model based on interband transitions in metallic components. This study provides a method to predict the behavior of the higher energy plasmon resonant modes in entirely antisymmetric structures such as compositional heterodimers.

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Multipolar and dark-mode plasmon resonances on drilled silver nano-triangles

Cited by 26 publications

References 41 publications

Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode

Enhanced Third Harmonic Generation in Single Germanium Nanodisks Excited at the Anapole Mode

Higher Order Plasmonic Modes Excited in Ag Triangular Nanoplates by an Electron Beam

Resonance coupling in plasmonic nanomatryoshka homo- and heterodimers

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