Engineering the optical response of plasmonic nanoantennas

Fischer, Holger; Martin, Olivier J. F.

doi:10.1364/oe.16.009144

Cited by 410 publications

(327 citation statements)

References 54 publications

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“…This value approximates well the small substrateinduced frequency shift for nanoparticle plasmon resonances polarized parallel to a substrate. 33 The illumination is taken to be normal to the nanostructure plane, with polarization along the antenna axis.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

et al. 2013

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T he ability of metallic nanostructures to confine and enhance incident radiation offers unique possibilities for manipulating light at the nanoscale. These functionalities are enabled by the excitation of collective electron oscillations known as localized plasmon resonances. 1 When two or more nanostructures are placed next to each other, their plasmons can couple through near-field interactions and can give rise to a new set of hybridized collective plasmonic modes. 2À12 Plasmonic nanoclusters composed of three, 13 four, 8,14,15 seven particles, 9 and even larger aggregates 11,16 can also exhibit interference effects like Fano resonances 17À19 when the near-field coupling between each element is properly controlled. Fano resonances arise from the interference between superradiant and subradiant modes and produce extinction features with characteristic narrow and asymmetric line shapes. Because of their narrower spectral width compared to standard plasmon resonances and large induced field enhancements, Fano resonances have been used for a variety of applications including plasmonic rulers 20À22 and biosensors. 23À25 Despite a large and recent research effort, the design of plasmonic structures exhibiting Fano resonances at specific wavelengths is a challenging task because of their complex nature. A central issue in this design is the spectral engineering of the resonances via controlled hybridization of the available modes. However, this is difficult in systems where higher order modes are excited in the spectral range of interest 12,26,27 or when the modes are very complex and spatially extend over a large part of the nanostructure. 28,29 A small variation of the geometries, like what can occur during the nanofabrication process, can drastically change the resonance line shape and wavelength. This difficulty is particularly challenging when designing Fano resonant structures using spherical or disk shaped nanoparticles where the energies of the individual nanoparticle plasmons are similar and all hybridization and tuning must be accomplished by controlling the interparticle spacings.A more robust approach for Fano resonant systems is to engineer them from metallic nanorods that support highly tunable and polarization sensitive longitudinal

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Section: Resultsmentioning

confidence: 99%

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

et al. 2013

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“…For larger antennas with complicated shapes, such as those shown schematically in Figure 1.11(a), the description via an analytic model is quite difficult, and numerical simulation methods based on the solution of Maxwell's equations have to be applied to calculate their optical properties. Specifically, for bow-tie antennas, the resonance frequency and also the field enhancement are critically dependent on the particular shape and can be tuned by the variation of the length h, opening angle θ , thickness t, and gap size d, as well as the choice of the substrate for the bow-tie fabrication [45,42].…”

Section: Plasmonic Nanostructures For Field Enhancementmentioning

confidence: 99%

“…The optimization of the evaporation conditions improved the surface roughness (measured by the root-mean-squared (RMS) value of the surface height) and enabled the fabrication of high quality nanoantennas. Plasmonic nanostructures offer unique possibilities for enhancing linear and nonlinear optical processes [45,50,51,52,53,6]. Recently, Kim et al [24] reported nanostructure-enhanced high harmonic generation (HHG).…”

Section: Home-built Vacuum Setup For Euv Light Generation and Spectramentioning

confidence: 99%

Extreme-ultraviolet light generation in plasmonic nanostructures

et al. 2013

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The present (cumulative) thesis examines fundamentals of nanostructure-enhanced extreme-ultraviolet light generation in noble gases using two different nanostructure geometries for local field-enhancement. Specifically, resonant antennas and tapered hollow waveguide nanostructures are utilized to enhance low-energy femtosecond laser pulses, which in turn induce light emission from excited xenon, argon and neon atoms and ions. Spectral analysis of this radiation reveals that coherent high-order harmonic generation is not feasible under the examined conditions, contrary to former expectations and reports. Instead, the spectral characteristics unequivocally identify that incoherent fluorescence from multiphoton excited and strong-field ionized gas atoms is the predominant process in such schemes. Furthermore, novel nanostructure-enhanced effects are reported such as surface-enhanced fifth-order harmonic generation (from bow-tie nanoantennas) and the formation of a bistable nanoplasma (in a hollow waveguide). These effects offer intriguing links between nonlinear nano-optics, plasma dynamics and extreme-ultraviolet radiation.v vi

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“…[10][11][12] Moreover, the resonance frequency of plasmonic dipole antennas can be tuned to a desired value by varying the antenna length or gap size, providing additional design flexibility. 13 While the emphasis of the present publication is on trapping nanoscopic objects in the gap of the antenna, let us mention that microscopic cells have been trapped using the field generated by the whole plasmonic antenna by Righini et al 14 In addition to an enhanced trapping force, a plasmonic antenna can also be used to monitor in real time the trapping events from nonfluorescent nanoparticles, including particles as small as 10 nm. Actually, there is still today a lack of rapid and noninvasive methods for the detection of small nonfluorescent nanoparticles, although this detection is important for many practical applications.…”

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confidence: 99%

Trapping and Sensing 10 nm Metal Nanoparticles Using Plasmonic Dipole Antennas

et al. 2010

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The optical trapping of Au nanoparticles with dimensions as small as 10 nm in the gap of plasmonic dipole antennas is demonstrated. Single nanoparticle trapping events are recorded in real time by monitoring the Rayleigh scattering spectra of individual plasmonic antennas. Numerical simulations are also performed to interpret the experimental results, indicating the possibility to trap nanoparticles only a few nanometers in size. This work unveils the potential associated with the integration of plasmonic trapping with localized surface plasmon resonance based sensing techniques, in order to deliver analyte to specific, highly sensitive regions ("hot spots").

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Engineering the optical response of plasmonic nanoantennas

Cited by 410 publications

References 54 publications

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

Mechanisms of Fano Resonances in Coupled Plasmonic Systems

Extreme-ultraviolet light generation in plasmonic nanostructures

Trapping and Sensing 10 nm Metal Nanoparticles Using Plasmonic Dipole Antennas

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