Direct optical excitation of dark plasmons for hot electron generation

Mueller, Niclas S.; Vieira, Bruno G. M.; Höing, Dominik; Schulz, Florian; Barros, Eduardo B.; Lange, Holger; Reich, Stéphanie

doi:10.1039/c8fd00149a

Cited by 15 publications

(40 citation statements)

References 43 publications

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“…3c ), demonstrating the control of the structural parameters in the synthesis process. The number, energy, and spectral width of the polaritonic modes depends sensitively on the interparticle distance, number of layers, AuNP shape, diameter, and lattice type 35 , 36 , 53 , 54 . In consequence, an accurate control of all these parameters enables the design of tailored optical materials.…”

Section: Resultsmentioning

confidence: 99%

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Structural order in plasmonic superlattices

et al. 2020

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The assembly of plasmonic nanoparticles into ordered 2D-and 3D-superlattices could pave the way towards new tailored materials for plasmonic sensing, photocatalysis and manipulation of light on the nanoscale. The properties of such materials strongly depend on their geometry, and accordingly straightforward protocols to obtain precise plasmonic superlattices are highly desirable. Here, we synthesize large areas of crystalline mono-, bi-and multilayers of gold nanoparticles >20 nm with a small number of defects. The superlattices can be described as hexagonal crystals with standard deviations of the lattice parameter below 1%. The periodic arrangement within the superlattices leads to new well-defined collective plasmon-polariton modes. The general level of achieved superlattice quality will be of benefit for a broad range of applications, ranging from fundamental studies of light-matter interaction to optical metamaterials and substrates for surface-enhanced spectroscopies.

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Section: Resultsmentioning

confidence: 99%

“…The plasmonic dipole strength, which is relevant for the periodic coupling, scales with particle size, yielding small AuNPs less attractive for periodic dipole field coupling. For example, to observe well-defined plasmon polaritons, the minimum AuNP diameter is~25 nm 36,53,54 .…”

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confidence: 99%

Structural order in plasmonic superlattices

et al. 2020

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“…Beyond SERS, the narrow peak width of the dark mode is also ideal for refractive index sensing. Recently, we showed that such plasmons can be excellent channels for generating hot-electrons that can be used for photocatalytical applications 24 . All the discussions presented in this study, together with the already well developed methods for the materials synthesis, show how promising they are for plasmonic applications, being also very intriguing from the theoretical point of view.…”

Section: Resultsmentioning

confidence: 99%

“…Alaeian et al 25 studied spherical and octahedral nanoparticles superlattices and showed that they behave as metamaterials with magnetic response. Our recent studies also provided some theoretical analysis on the self-assembly of NMNPs, but the focus was mostly on experimental measurements and potential applications of these materials 23,24 . Furthermore, there is a number of theoretical studies on arrays of metal-insulator-metal particles (MIMs) [26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Properties of Close-Packed Metallic Nanoparticle Mono- and Bilayers

et al. 2019

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The self-assembly of metallic nanoparticles is a promising route to metasurfaces with unique properties for many optical applications, such as surface-enhanced spectroscopy, light manipulation, and sensing. We present an in-depth theoretical study of the optical properties of mono-and bilayers assembled from gold and silver nanoparticles. With finite-difference time-domain simulations, we predict the occurence of two plasmon modes, a bright and a dark mode, which exhibit symmetric and antisymmetric dipole configurations between the layers, respectively. The dark mode resonance energy depends sensitively on the size of the particles and the interparticle gaps. Hotspots with a nearfield intensity enhancement of up to 3000 are expected, which, together with the fact that the dark mode is roughly four times narrower than the bright mode, reveals how promising these materials are for spectroscopy purposes.

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“…The various applications of plasmonics require a control over the excitation of plasmonic modes. Some plasmon modes are better for optical enhancement and others for producing hot carriers [6]. Based on their lifetime and dipole moment plasmonic modes are divided into bright and dark [7,8].…”

Section: Introductionmentioning

confidence: 99%

Selective excitation of localized surface plasmons by structured light

Litvin¹,

Mueller²,

Reich³

2020

Opt. Express

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We investigated the selective excitation of localized surface plasmons by structured light. We derive selection rules using group theory and propose a fitting integral to quantify the contribution of the eigenmodes to the absorption spectra. Based on the result we investigate three nano oligomers of different symmetry (trimer, quadrumer, and hexamer) in detail using finitedifference time-domain simulations. We show that by controlling the incident light polarization and phase pattern we are able to control the absorption and scattering spectra. Additionally, we demonstrate that the fitting between the incident light and the oligomer modes may favor a number of modes to oscillate. Dark modes produce strong changes in the absorption spectrum and bright modes in the scattering spectrum. The experimental precision (axial shift error) may be on the same order as the oligomer diameter making the orbital angular momentum selection rules robust enough for experimental observation.

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Direct optical excitation of dark plasmons for hot electron generation

Abstract: We demonstrate the excitation of dark modes and creation of hot electrons using linearly polarized light and scalable, cost-effective plasmonic surfaces.

Cited by 15 publications

References 43 publications

Structural order in plasmonic superlattices

Structural order in plasmonic superlattices

Plasmonic Properties of Close-Packed Metallic Nanoparticle Mono- and Bilayers

Selective excitation of localized surface plasmons by structured light

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