Grating-induced plasmon mode in gold nanoparticle arrays

Félidj, Nordin; Laurent, Guillaume; Aubard, J.; Lévi, G.; Hohenau, Andreas; Krenn, Joachim R.; Aussenegg, F. R.

doi:10.1063/1.2140699

Cited by 115 publications

(118 citation statements)

References 22 publications

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“…The shape and spectral position of this mode suggest that the excitation of the incident light results in a dipolar mode with free-electrons oscillating along the diameter of the gold nano-cylinders [25,26]. However, the quite visible red-shift of this mode, observed for both TE and TM polarizations at an increase of the incidence angle of the exciting light ( Figure 4A and B), excludes that this is a purely dipolar mode as observed in case of a single NP: we expect that the regular arrangement of nano-cylinders influences their plasmonic behavior [27][28][29]. Indeed, for the range of wavelengths in the close vicinity of this plasmon peak, no radiative diffracted orders but evanescent waves [expressed as in Eq.…”

Section: Methodsmentioning

confidence: 78%

Angular plasmon response of gold nanoparticles arrays: approaching the Rayleigh limit

et al. 2016

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Abstract:The regular arrangement of metal nanoparticles influences their plasmonic behavior. It has been previously demonstrated that the coupling between diffracted waves and plasmon modes can give rise to extremely narrow plasmon resonances. This is the case when the singleparticle localized surface plasmon resonance (λ LSP ) is very close in value to the Rayleigh anomaly wavelength (λ RA ) of the nanoparticles array. In this paper, we performed angle-resolved extinction measurements on a 2D array of gold nano-cylinders designed to fulfil the condition λ RA < λ LSP . Varying the angle of excitation offers a unique possibility to finely modify the value of λ RA , thus gradually approaching the condition of coupling between diffracted waves and plasmon modes. The experimental observation of a collective dipolar resonance has been interpreted by exploiting a simplified model based on the coupling of evanescent diffracted waves with plasmon modes. Among other plasmon modes, the measurement technique has also evidenced and allowed the study of a vertical plasmon mode, only visible in TM polarization at off-normal excitation incidence. The results of numerical simulations, based on the periodic Green's tensor formalism, match well with the experimental transmission spectra and show fine details that could go unnoticed by considering only experimental data.

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Section: Methodsmentioning

confidence: 78%

Angular plasmon response of gold nanoparticles arrays: approaching the Rayleigh limit

et al. 2016

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“…This effect arises from the near-field diffraction of the incident light by the grating formed by the nanoantenna array [26][27][28][29] . When the incident light matches the critical grating period…”

Section: Resultsmentioning

confidence: 99%

“…Þ is the refractive index of the ITO (water) and y inc is the incident angle, incident light switches from evanescent to propagating, is diffracted parallel to the transverse plane, and results in a grating resonance, also known as the Rayleigh anomaly 26,28 . Here, G c B515, 590 and 650 nm for l OR , l NR and l R , respectively.…”

Section: Resultsmentioning

confidence: 99%

Understanding and controlling plasmon-induced convection

et al. 2014

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The heat generation and fluid convection induced by plasmonic nanostructures is attractive for optofluidic applications. However, previously published theoretical studies predict only nanometre per second fluid velocities that are inadequate for microscale mass transport. Here we show both theoretically and experimentally that an array of plasmonic nanoantennas coupled to an optically absorptive indium-tin-oxide (ITO) substrate can generate 4micro-metre per second fluid convection. Crucially, the ITO distributes thermal energy created by the nanoantennas generating an order of magnitude increase in convection velocities compared with nanoantennas on a SiO 2 base layer. In addition, the plasmonic array alters absorption in the ITO, causing a deviation from Beer-Lambert absorption that results in an optimum ITO thickness for a given system. This work elucidates the role of convection in plasmonic optical trapping and particle assembly, and opens up new avenues for controlling fluid and mass transport on the micro-and nanoscale.

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“…In each case, failure to observe the sharp spectral features appears to be due to one or more of the following factors: lack of an homogeneous environment, an angle spread of the illumination, an inappropriate choice of the particle volume and aspect ratio. Félidj et al [19] reported sharp features in a system consisting of a regular array of gold nanorods supported on a thin indium tin oxide (ITO) layer. However, the presence of the ITO layer complicates the analysis and makes the underlying physics harder to unravel: such a system leads to a rich physics when the ITO is thick enough to support waveguide modes that interact with the LSPR [20].…”

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confidence: 99%

Collective Resonances in Gold Nanoparticle Arrays

2008

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We present experimental evidence of sharp spectral features in the optical response of 2D arrays of gold nanorods. A simple coupled dipole model is used to describe the main features of the observed spectral line shape. The resonance involves an interplay between the excitation of plasmons localized on the particles and diffraction resulting from the scattering by the periodic arrangement of these particles. We investigate this interplay by varying the particle size, aspect ratio, and interparticle spacing, and observe the effect on the position, width, and intensity of the sharp spectral feature. DOI: 10.1103/PhysRevLett.101.143902 PACS numbers: 42.25.Fx, 73.20.Mf Nanoparticles of noble metals have been the subject of many detailed studies due to their unique optical properties [1], in particular because they can support localized surface plasmon resonances (LSPR) [2]. The LSPR associated with metal nanoparticles exhibit a high degree of optical field confinement [3,4], together with a high sensitivity to their local environment. Where two or more metallic nanostructures are in close proximity, the possibility exists for interaction between the modes of the individual nanostructures to form new hybrid modes [5]. The case of two interacting particles has been extensively studied (for example, see [6]). For multiple nanostructures there is also the possibility of coherent interaction arising from multiple scattering. Light that is scattered so as to propagate in the plane of the particles will undergo multiple scattering by the regularly spaced particles. A geometric resonance arises when the wavelength of the scattered light is commensurate with the periodicity of the array, which, when it occurs in the same spectral range as the LSPR, may lead to a dramatic modification of the measured optical extinction. It appears that this effect was first predicted by Carron et al. (see, for example,[7]) and Markel [8,9] and more recently followed up by Zou et al. [10]. Further theoretical or computational work by these groups has extended our understanding [8][9][10][11][12][13], and a tutorial review linking these concepts to those associated with hole arrays has recently been given [14].Experiments to confirm the existence of these sharp diffractive features in the optical response of metallic nanoparticle arrays have met with only limited success. Haynes et al. [18] performed detailed studies of arrays of gold and silver nanoparticles, but the effect was not as pronounced as expected from the modeling. In each case, failure to observe the sharp spectral features appears to be due to one or more of the following factors: lack of an homogeneous environment, an angle spread of the illumination, an inappropriate choice of the particle volume and aspect ratio. Félidj et al. [19] reported sharp features in a system consisting of a regular array of gold nanorods supported on a thin indium tin oxide (ITO) layer. However, the presence of the ITO layer complicates the analysis and makes the underlying physics harder to unrav...

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Grating-induced plasmon mode in gold nanoparticle arrays

Cited by 115 publications

References 22 publications

Angular plasmon response of gold nanoparticles arrays: approaching the Rayleigh limit

Angular plasmon response of gold nanoparticles arrays: approaching the Rayleigh limit

Understanding and controlling plasmon-induced convection

Collective Resonances in Gold Nanoparticle Arrays

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