Nanoantennas for visible and infrared radiation

Biagioni, Paolo; Huang, Jer‐Shing; Hecht, Bert

doi:10.1088/0034-4885/75/2/024402

Cited by 818 publications

(818 citation statements)

References 330 publications

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“…Additionally, much more complex structures such as split ring resonators, diverse antennas, and hollow waveguides are also known. The manifold research activity in this topic has led to an impressively large number of reports [9,10,11,41,42] and several textbooks [43,39] about the optical properties of light-concentrating nanostructures and possible applications. Due to the tremendous variety of imaginable geometries and effects, it is not in the scope of this thesis to give a complete overview of the whole field of plasmonics.…”

Section: Plasmonic Nanostructures For Field Enhancementmentioning

confidence: 99%

“…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%

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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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Section: Plasmonic Nanostructures For Field Enhancementmentioning

confidence: 99%

Section: Plasmonic Nanostructures For Field Enhancementmentioning

confidence: 99%

Extreme-ultraviolet light generation in plasmonic nanostructures

et al. 2013

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“…Plasmonic antennas consisting of pairs of closely spaced metal nano particles have gained much attention in this context since they provide the possibility to strongly concentrate optical fields into the gap between the two metal particles [2][3][4] . Pairs of closely spaced metal nanoparticles supporting plasmonic gap resonances consequently find broad applications, e.g.…”

mentioning

confidence: 99%

“…Variation of the gap width strongly influences the electromagnetic coupling strength and therefore causes characteristic shifts of the modes 4,17,18 . For all investigated gap widths (0.3 to 3.6 nm) we observe four characteristic resonances in the visible spectral range.…”

mentioning

confidence: 99%

Atomic-Scale Confinement of Resonant Optical Fields

Kern¹,

Großmann²,

Tarakina³

et al. 2012

Nano Lett.

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137

157

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2The interaction of light and matter, i.e. absorption and emission of photons, can be considerably enhanced in the presence of strongly localized and therefore highly intense optical near fields 1 .Plasmonic antennas consisting of pairs of closely spaced metal nano particles have gained much attention in this context since they provide the possibility to strongly concentrate optical fields into the gap between the two metal particles [2][3][4] . Pairs of closely spaced metal nanoparticles supporting plasmonic gap resonances consequently find broad applications, e.g. in single-emitter surfaceenhanced spectroscopy 5,6 , quantum optics 7 , extreme nonlinear optics 8-10 , optical trapping 11 , metamaterials 12, 13 and molecular opto-electronics 14 .The success of metal-insulator-metal structures is based on two fundamental properties of their anti-symmetric electromagnetic gap modes. (i) As a direct consequence of the boundary conditions, the dominating field components normal to the metal-dielectric interfaces are sizable only inside the dielectric gap. This means that for anti-symmetric gap modes the achievable field confinement is not limited by the skin depth of the metal, but is solely determined by the actual size of the gap. (ii) Since the free electrons of the metal respond resonantly to an external optical frequency field, enormous surface charge accumulations, accompanied by ultra-intense optical near fields, will occur. In addition, with decreasing gap width, stronger attractive coulomb forces 4 across the gap lead to further surface-charge accumulation and a concomitantly increased near-field intensity enhancement. We therefore conclude that an experimental realization of atomic-scale concentration of electromagnetic fields at visible frequencies is possible but it requires atomic-scale shape control of the field-confining structure, i.e. the gap, as well as a careful assignment and selection of suitable optical modes.Here we achieve atomic-scale confinement of electromagnetic fields at visible frequencies by combining for the first time both atomic-scale shape control of the field confining structure 15 as well as a careful selection and assignment of suitable optical modes [16][17][18] . We study single-crystalline nanorods which self-assemble into side-by-side aligned dimers with gap widths below 0.5 nm. Sideby-side aligned nanorod dimers possess various distinguishable symmetric and anti-symmetric 3 modes in the visible range 19 . In contrast to previous work 20-22 we demonstrate full control over symmetric and anti-symmetric optical modes by means of white-light scattering experiments. We experimentally demonstrate the presence of atomic-scale light confinement in these structures by observing an extreme > 800 meV hybridization splitting of corresponding symmetric and antisymmetric dimer modes. Our results open new perspectives for atomically-resolved spectroscopic imaging, deeply nonlinear optics and attosecond physics, cavity optomechanics and ultra-sensing as well as quantum optics.To obtain nano...

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“…Optical nanoantennas based on localized surface plasmon resonance [7,8] are becoming more appealing since they can efficiently link far field radiation with the localized near field, allowing for high electromagnetic field enhancement, deep subwavelength confinement of light and tailoring of the local density of photonic states [4,9,10]. Fluorescence from emitters and Raman scattering of a molecule in the vicinity of plasmonic nanoantennas can be substantially enhanced, enabling the detection of species even down to single molecule level.…”

Section: Introductionmentioning

confidence: 99%

Broadband Nanoantennas for Plasmon Enhanced Fluorescence and Raman Spectroscopies

Yong¹,

Zhang²,

Dong³

et al. 2015

PIER

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Abstract-We propose a novel design of broadband plasmonic nanoantenna that is suitable for fluorescence and Raman enhancement. The structure consists of a gold nanoring and bowties at the center. We numerically investigate the near field and far field performance by employing the finitedifference time-domain method. High Purcell enhancement and large SERS are demonstrated in a record wide spectral bandwidth of 700 nm based on a single emitter-antenna configuration. Moreover, unlike a traditional antenna design, the proposed nanoantenna has low heat generation and high field enhancement at the gap simultaneously when operating off resonance.

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Nanoantennas for visible and infrared radiation

Cited by 818 publications

References 330 publications

Extreme-ultraviolet light generation in plasmonic nanostructures

Extreme-ultraviolet light generation in plasmonic nanostructures

Atomic-Scale Confinement of Resonant Optical Fields

Broadband Nanoantennas for Plasmon Enhanced Fluorescence and Raman Spectroscopies

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