Boosting Fano resonances in single layered concentric core–shell particles

Sancho‐Parramon, Jordi; Jelovina, Denis

doi:10.1039/c4nr03879g

Cited by 25 publications

(31 citation statements)

References 77 publications

(139 reference statements)

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“…2(d)) is markedly distinct from the typical transverse quadrupole mode. Interestingly, this type of quadrupole excitation is typically referred to as a "dark" mode in plasmonic dimer antennas [28,29]. These results highlight the fact that such modes are only "dark" because they cannot be excited by conventional linearly (or circularly) polarized sources.…”

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confidence: 84%

Beam engineering for selective and enhanced coupling to multipolar resonances

et al. 2015

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Multipolar electromagnetic phenomena in sub-wavelength resonators are at the heart of metamaterial science and technology. In this letter, we demonstrate selective and enhanced coupling to specific multipole resonances via beam engineering. We first derive an analytical method for determining the scattering and absorption of spherical nanoparticles (NPs) that depends only on the local electromagnetic field quantities within an inhomogeneous beam. Using this analytical technique, we demonstrate the ability to drastically manipulate the scattering properties of a spherical NP by varying illumination properties and demonstrate the excitation of a longitudinal quadrupole mode that cannot be accessed with conventional illumination. This work enhances the understanding of fundamental light-matter interactions in metamaterials, and lays the foundation for researchers to identify, quantify, and manipulate multipolar light-matter interactions through optical beam engineering. Here, we instead demonstrate engineering of multipolar light-matter interactions by modifying properties of the illuminating radiation. In this approach we exploit the incident illumination beam to gain information about our multipolar system.In this work, we rigorously derive a simplified, analytical method directly from Mie theory to quantify multipolar light absorption and scattering for a spherical nanoparticle (NP) illuminated by any light source of interest. First, we prove that dipolar and quadrupolar interactions depend only on local fields or field gradients respectively. Building from this local-field approach we investigate scattering of NPs in linearly, azimuthally, and radially polarized focused light beams. We demonstrate selective suppression and enhancement of individual multipolar modes by manipulating beam symmetries and numerical apertures. These calculations reveal a longitudinal quadrupole mode, which is completely inaccessible by conventional linearly polarized light. Additionally, we achieve selective excitation of individual multipolar modes. This work demonstrates a method for quantifying multipolar interactions in sub-wavelength particles and establishes beam engineering as a powerful method for manipulating multipolar phenomena.Conventionally, scattering and absorption of spherical NPs is calculated with Generalized Lorenz Mie theory (GLMT) [15], which involves expressing an incident beam as a plane wave or spherical wave expansion [16]. These expansions require knowing the electric field everywhere on a planar [E (x, y, z = z 0 )] or spherical [E (θ, φ, r = r 0 )] surface respectively. This approach is complete, and can be used to describe interactions with spherical NPs of any size or composition. However, NPs used in plasmonics or metamaterials are typically in a size regime where only dipolar and quadrupolar modes contribute to the optical response. For these cases, we derive a greatly simplified approach for calculating scattering and absorption in inhomogeneous fields, inspired by the multipolar interaction Hamiltoni...

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confidence: 84%

Beam engineering for selective and enhanced coupling to multipolar resonances

et al. 2015

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“…16 When the core size is increased beyond the quasistatic regime, it has been theoretically predicted that cavity plasmons with narrow linewidths can interact strongly with the incident optical field because of the phase retardation effect 21 and can give rises to Fano resonances to maintain the high quality factors of the cavity plasmons. [22][23][24] However, due to the particular challenge in the wet-chemistry based preparation of core-shell structures with a relatively large (comparable to the resonance wavelength) dielectric core and a perfect (dense, smooth, and complete) metal shell layer, 19,[25][26][27] the sharp cavity plasmons and its induced Fano resonances in DMCSRs have not been experimentally demonstrated. 14,[21][22][23][24] In this letter, we report on the realization of spherical DMCSRs with a nearly perfect metal shell by physically depositing silver films onto the both sides of self-supporting polystyrene (PS) colloids.…”

Section: Experimental Observation Of Sharp Cavity Plasmon Resonances mentioning

confidence: 99%

Experimental observation of sharp cavity plasmon resonances in dielectric-metal core-shell resonators

Wan

Shen

et al. 2015

Applied Physics Letters

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We report on the experimental realization of dielectric-metal core-shell resonators with a nearly perfect metal shell layer by physically depositing metal onto the self-supporting dielectric colloids. Sharp electric and magnetic-based cavity plasmon resonances are experimentally observed, whereas increasing the metal shell thickness increases their Q-factors while narrowing their linewidths. In particular, a high Q-factor up to ∼100 with a correspondingly narrow linewidth down to ∼12 nm is experimentally obtained at a dipolar magnetic cavity plasmon resonance. Simulations and analytical Mie calculations show excellent agreements with the experimental results and demonstrate strong optical field confinement of such three-dimensional resonators.

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“…In particular, gold nanoshells have attracted significant attention for its application in biotechnology and biomedicine [2][3][4][5][6][7][8][9][10][11] because of its good biocompatibility and high chemical stability in addition to its tunable optical properties. e occurrence of morphology-dependent LSPRs in metallic nanostructures has stimulated numerous simulation studies [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. e simulation of interaction of light with metallic nanostructures is an important part of the scientific progress in the plasmonic field.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of the Optical Response of Silicon/Silica/Gold Multishell Nanoparticles in Biological Tissue

Chaâbani

Chehaidar

Proust

et al. 2019

Advances in Materials Science and Engineering

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e scattering and absorption efficiencies of light by a single silicon/silica/gold spherical multishell in biological tissues are analyzed theoretically in the framework of Lorenz-Mie theory and finite-difference time-domain formalism. We first revised the ideal case of a concentric silicon/gold nanoshell, analyzed the effect of growing a silica layer of uniform thickness around the silicon core, and then examined the effect of an offset of the gold shell with respect to the centre of the silicon/silica nanoshell. Our simulation showed that the silicon/gold nanoshell in the biological tissue supports significant absorption and scattering resonances in the biological spectral window. On the contrary, the growth of a silica layer on the silicon core surface leads to a blueshift of these resonances accompanied by a slight increase of their magnitudes. e offset of the gold shell with respect to the silicon/ silica core results in a redshift of the absorption and scattering resonances supported by the concentric silicon/silica/gold multishell within the biological window, accompanied by a decrease in their amplitudes. On the contrary, the gold shell offset gives rise to a more prominent electric field enhancement at the silicon/silica/gold multishell-biological tissue interface. Our simulation thus shows that silicon/silica/gold multishell nanoparticles are potential candidates in bioimaging and photothermal therapy applications.

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Boosting Fano resonances in single layered concentric core–shell particles

Cited by 25 publications

References 77 publications

Beam engineering for selective and enhanced coupling to multipolar resonances

Beam engineering for selective and enhanced coupling to multipolar resonances

Experimental observation of sharp cavity plasmon resonances in dielectric-metal core-shell resonators

Theoretical Analysis of the Optical Response of Silicon/Silica/Gold Multishell Nanoparticles in Biological Tissue

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