Diffractive dipolar coupling in non-Bravais plasmonic lattices

Becerril, David; Vázquez, Omar; Piccotti, Diego; Sandoval, Elizabeth Mendoza; Cesca, Tiziana; Mattei, Giovanni; Noguez, Cecilia; Pirruccio, Giuseppe

doi:10.1039/d0na00095g

Cited by 16 publications

(11 citation statements)

References 65 publications

(86 reference statements)

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“…Therefore, following our previous work on arrays with multiparticle unit cells (see also refs. , , and ), we can write the x -component of dipole induced in a given nanoparticle as where we use Greek indices to denote the unit cell to which the particle belongs and Latin ones to label each of the two particles within the unit cell. Furthermore, the prime in the first summation indicates that the terms ν = μ are excluded from it when i = j , since a dipole does not interact with itself, and G ij , μν is the xx -component of the dipole–dipole interaction tensor, defined as with T μ – T ν being the vector connecting the μ and ν unit cells and k = 2π/λ the wavenumber.…”

Section: Resultsmentioning

confidence: 99%

Super- and Subradiant Lattice Resonances in Bipartite Nanoparticle Arrays

et al. 2020

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Lattice resonances, the collective modes supported by periodic arrays of metallic nanoparticles, give rise to very strong and spectrally narrow optical responses. Thanks to these properties, which emerge from the coherent multiple scattering enabled by the periodic ordering of the array, lattice resonances are used in a variety of applications such as nanoscale lasing and biosensing. Here, we investigate the lattice resonances supported by bipartite nanoparticle arrays. We find that, depending on the relative position of the two particles within the unit cell, these arrays can support lattice resonances with a super-or subradiant character. While the former result in large values of reflectance with broad lineshapes due to the increased radiative losses, the latter give rise to very small linewidths and maximum absorbance, consistent with a reduction of the radiative losses. Furthermore, by analyzing the response of arrays with finite dimensions, we demonstrate that the subradiant lattice resonances of bipartite arrays require a much smaller number of elements to reach a given quality factor than the lattice resonances of arrays with single-particle unit cells. The results of this work, in addition to advancing our knowledge of the optical response of periodic arrays of nanostructures, provide an efficient approach to obtain narrow lattice resonances that are robust to fabrication imperfections.

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Section: Resultsmentioning

confidence: 99%

Super- and Subradiant Lattice Resonances in Bipartite Nanoparticle Arrays

et al. 2020

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“…For both finite and infinite arrays, two different geometries are considered: square array of Al NPs, and a honeycomb array of Au NPs; see Figure 1. Depending on the application and spectral range of CLRs, square arrays of plasmonic NPs are widely considered in Ag [46], Au [5,47,48], Al [41,44,[49][50][51] and TiN [52] NPs, whereas honeycomb lattices are considered for Ag [53][54][55][56] and Au [57] NPs, within ED approximation in almost all cases.…”

Section: Methodsmentioning

confidence: 99%

Multipolar Lattice Resonances in Plasmonic Finite-Size Metasurfaces

et al. 2021

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Collective lattice resonances in regular arrays of plasmonic nanoparticles have attracted much attention due to a large number of applications in optics and photonics. Most of the research in this field is concentrated on the electric dipolar lattice resonances, leaving higher-order multipolar lattice resonances in plasmonic nanostructures relatively unexplored. Just a few works report exceptionally high-Q multipolar lattice resonances in plasmonic arrays, but only with infinite extent (i.e., perfectly periodic). In this work, we comprehensively study multipolar collective lattice resonances both in finite and in infinite arrays of Au and Al plasmonic nanoparticles using a rigorous theoretical treatment. It is shown that multipolar lattice resonances in the relatively large (up to 6400 nanoparticles) finite arrays exhibit broader full width at half maximum (FWHM) compared to similar resonances in the infinite arrays. We argue that our results are of particular importance for the practical implementation of multipolar lattice resonances in different photonics applications.

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“…We begin by applying our method to the case of a honeycomb monolayer of Ag nanospheres with radius a = 10 nm, described by a Drude dielectric function, and hosted within a homogeneous medium of dielectric constant √ h = 1.46, which describe the substrate used in experimental systems [14]. The separation distance between particle centers in a layer is d = 3a, so that we can safely restrict our calculations to the dipole approximation (l max = 1) [29].…”

Section: Monolayermentioning

confidence: 99%

“…These modes show a collective behavior on the long-range scale, involving several unit cells. They have been recently studied also in non-Bravais [14][15][16] and vertically stacked plasmonic lattices [17]. Diffractive lattices present striking spectral far-field properties, among which Fano-like resonances, electromagnetically induced transparency windows, ultra-sharp linewidth are just few examples [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Optical band engineering via vertical stacking of honeycomb plasmonic lattices

Becerril,

Pirruccio,

Noguez

2021

Preprint

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Inspired by recent advances in atomic homo and heterostructures, we consider the vertical stacking of plasmonic lattices as a new degree of freedom to create a coupled system showing a modified optical response concerning the monolayer. The precise design of the stacking and the geometrical parameters of two honeycomb plasmonic lattices tailors the interaction among their metallic nanoparticles. Based on the similarity of the lattice symmetry, analogies can be drawn with stacked atomic crystals, such as graphene. We use the multipolar spectral representation to study the plasmonic vertical stack's optical response in the near-field regime, emphasizing symmetry properties. The strong coupling of certain optical bands and polarization switch of the interacting bands. By leveraging these effects, we engineer the near-field intensity distribution. Besides, lifting band degeneracy at specific points of the Brillouin zone is obtained with the consequent opening of mini-gaps. These effects are understood by quantifying the multipolar coupling among nanospheres belonging to the same and different sublattices, as well as the interlayer and intralayer nanoparticle interactions. Differences with the atomic case are also analyzed and explained in terms of the stack's interaction matrix. Finally, we predict the absorption spectrum projected on the two orthogonal linear polarizations.

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Diffractive dipolar coupling in non-Bravais plasmonic lattices

Abstract: Honeycomb plasmonic lattices are characterized by a 2-particle unit cell. The difference between the intrasublattice and intersublattice coupling is distinctive of non-Bravais lattices. Although the two particles are identical the two types of coupling may be different.

Cited by 16 publications

References 65 publications

Super- and Subradiant Lattice Resonances in Bipartite Nanoparticle Arrays

Super- and Subradiant Lattice Resonances in Bipartite Nanoparticle Arrays

Multipolar Lattice Resonances in Plasmonic Finite-Size Metasurfaces

Optical band engineering via vertical stacking of honeycomb plasmonic lattices

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