Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

Lumdee, Chatdanai; Yun, Binfeng; Kik, Pieter G.

doi:10.1039/c4nr05893c

Cited by 29 publications

(34 citation statements)

References 20 publications

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“…20,21 Recent publications have reported on the important role of surface roughness on the far-and near-field as well as nonlinear optical properties of nanoparticles. [22][23][24][25] In an experiment published in 2012, 26 it was shown that the resonance of a film-coupled nanoparticle system undergoes a shift that cannot be explained by a simple local constitutive relation between the electric field E and the polarization P of a metal: a more complex, nonlocal , 27 relation accounting for electron-electron interactions had to be considered in order to…”

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confidence: 99%

Impact of Surface Roughness in Nanogap Plasmonic Systems

et al. 2020

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Recent results have shown unprecedented control over separation distances between two metallic elements hundreds of nanometers in size, underlying the effects of freeelectron nonlocal response also at mid-infrared wavelengths. Most of metallic systems however, still suffer from some degree of inhomogeneity due to fabrication-induced surface roughness. Nanoscale roughness in such systems might hinder the understanding of the role of microscopic interactions. Here we investigate the effect of surface roughness in coaxial nanoapertures resonating at mid-infrared frequencies. We show that 1 arXiv:2001.08953v1 [physics.optics] 24 Jan 2020 although random roughness shifts the resonances in an unpredictable way, the impact of nonlocal effects can still be clearly observed. Roughness-induced perturbation on the peak resonance of the system shows a strong correlation with the effective gap size of the individual samples. Fluctuations due to fabrication imperfections then can be suppressed by performing measurements on structure ensembles in which averaging over a large number of samples provides a precise measure of the ideal systems optical properties.Keywords plasmonics, surface roughness, nonlocal response, coaxial aperture, hydrodynamic model, epsilon-near-zero modePlasmonics allows the confinement of light well below the diffraction limit by greatly enhancing the electric field in the vicinity of metal surfaces. In the last decade, continuous developments in nanofabrication techniques have made it possible to control the separation distance between two metallic elements to a precision of a fraction of a nanometer. 1-7 Such systems, generally referred to as nanogap plasmonic structures, can squeeze light down to deep sub-wavelength volumes, allowing for the optical radiation to probe sub-atomic interactions. [8][9][10][11][12][13][14][15][16] Most of metallic systems however, still suffer from some degree of inhomogeneity due to nanoscale surface roughness, [17][18][19] which results in deviations of the optical properties with respect to ideally smooth systems. 20,21 Recent publications have reported on the important role of surface roughness on the far-and near-field as well as nonlinear optical properties of nanoparticles. [22][23][24][25] In an experiment published in 2012, 26 it was shown that the resonance of a film-coupled nanoparticle system undergoes a shift that cannot be explained by a simple local constitutive relation between the electric field E and the polarization P of a metal: a more complex, nonlocal , 27 relation accounting for electron-electron interactions had to be considered in order to

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Impact of Surface Roughness in Nanogap Plasmonic Systems

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“…Other groups have suggested that nanoparticle size distribution, 28,44 presence of facets, 28,39,44 variations in the nanoparticle−film gap distance, 27,29−32,34−36 and Au film roughness 45 are likely contributors to the particle-to-particle variability observed in single NPoF systems. The variability in the vertical antenna mode that we find is however less than the variability reported in the literature.…”

Section: Articlementioning

confidence: 99%

Effect of Film Thickness on the Far- and Near-Field Optical Response of Nanoparticle-on-Film Systems

Armstrong¹,

Liempt²,

Zijlstra

2019

Preprint

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<p>We study the near-field and far-field optical response of nanoparticle-on-film systems using single-nanoparticle spectroscopy and numerical simulations. We find that the optical spectra contain three dominant modes - a transverse dipole and quadrupole mode, and a dominant vertical antenna mode. We vary the thickness of the metal film from 10 – 45 nm, and find that the vertical antenna mode wavelength is nearly independent of the film thickness. In contrast, we find that the associated near-field enhancement in the gap between the particle and the film strongly depends on the film thickness. This trend is also observed in the far-field where the vertical antenna mode strongly increases in amplitude for increasing film-thicknesses up to the skin depth of gold. These findings are in good agreement with a numerical model and pave the way to study field-mediated processes such as fluorescence, SERS, and localized chemistry at the same resonance wavelength but at varying degrees of field enhancement.</p>

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“…2,3 That is an optoelectronic device that absorbs light with a certain wavelength region and generates electron-hole pairs, and then produces an electrical signal due to separation and directional movement of the electron-hole pairs. [5][6][7] Gold nanoparticle (AuNP), a nanostructure of three-dimensional submicrometre-size of gold atoms with unique physical and chemical properties different from those of the bulk state or atoms, [8][9][10] has recently attracted significant interest in photoelectric applications for realizing, for example, optically switchable transistors, 5,11 photovoltaic cells, 12,13 light-emitting diodes, 14 surface plasmonic devices 7,9,15,16 and photodetectors [17][18][19] due to the quantum size effect resulting in specific electronic structures. For example, broadband photodetectors could be loaded in spectrometric analyzer so that one photodetector can detect light from ultraviolet, visible, to infrared.…”

Section: Introductionmentioning

confidence: 99%

Remarkably enhanced red–NIR broad spectral absorption via gold nanoparticles: applications for organic photosensitive diodes

Luo

Wen

et al. 2015

Nanoscale

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For organic films, remarkably enhanced red-NIR broad spectral absorption was achieved via the incorporation of gold nanoparticles (AuNPs) using a simple and facile preparation. The relevant thermal evaporation method has produced size-controllable AuNPs in the range of 0-20 nm diameter. The potential use of localized surface plasmon resonance (LSPR) enhanced organic photosensitive diodes (OPDs) as sensitive broadband sensors was discussed in this context. Here we showed that, by combining organic heterojunctions with size-controllable plasmonic AuNPs, the efficiency of organic photodetectors could be increased by up to one order of magnitude, because of LSPR and scattering effects of the AuNPs. Fabricated OPD devices showed a large photoresponse under radiation from wavelengths between 650 and 830 nm, accompanied by a low power consumption profile. A schematic energy level model combined with theoretical simulation analysis was proposed to explain the experimental data. More importantly, to the best of our knowledge, this work demonstrated the broadest photosensitivity with high responsivity from AuNP-based photodetectors, proving the potential of AuNPs as a promising material for efficient optoelectronic devices.

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Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

Cited by 29 publications

References 20 publications

Impact of Surface Roughness in Nanogap Plasmonic Systems

Impact of Surface Roughness in Nanogap Plasmonic Systems

Effect of Film Thickness on the Far- and Near-Field Optical Response of Nanoparticle-on-Film Systems

Remarkably enhanced red–NIR broad spectral absorption via gold nanoparticles: applications for organic photosensitive diodes

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