Tuning resonances on crescent-shaped noble-metal nanoparticles

Rochholz, H.; Bocchio, Noelia L.; Kreiter, Maximilian

doi:10.1088/1367-2630/9/3/053

Cited by 102 publications

(186 citation statements)

References 31 publications

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“…[122,[125][126] In the last decade, focused research efforts were initiated that widened accessible structures by innovative combinations of angular dependent evaporation and etching steps. Thus, nanoscale discs, [127] rings, [128] ellipsoids [11] and crescent shaped particles [129][130] were successfully prepared as well as hole-films, [74,131] nanobowls, [132] nanoneedles, [14] membranes [132] and arrays of pillars of different materials. [133][134][135] …”

Section: Colloidal Lithographymentioning

confidence: 99%

“…A sketch of the charge distribution of the two basic resonances is shown in Figure 5.3.9a. The fundamental plasmonic mode, termed c 1 [130] resonance is excited when the electric field vector is parallel to the long axis of the crescent. The classification as "c"-resonance is given as the crescent appears as the letter c when 164…”

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

“…For the sample with 266 nm crescents, this resonance appears at 1692 nm. The first harmonic, coined u 1 [130] (as the crescent appears u-shaped with the electric field vector being vertical) is excited only with a polarization of light rotated 90° with respect to the c resonance case. The charge distribution, represented in blue in Figure 5.3.9a, shows similar phases in the tips, an opposing maximum at the center of the crescents and two nodes located in the wings of the crescents.…”

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

“…A second resonance, c2, can be excited at higher energies. [130] It can be described as the second harmonic, featuring two nodes and a charge distribution as shown in the inset of Figure 5.3.9a. For the array of 266 nm crescents, the c2 resonance appears at 925 nm.…”

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

“…Arrays nanoscale crescents [136,252] can be constructed using nonclose-packed monolayers, the preparation of which has been introduced in chapter 5.2.2. Such objects are of special interest as they support several multipolar resonances [129][130]148] and can be described as nanoscale split ring resonators. Thus, a possibility to design metamaterials in a cost-efficient way is introduced.…”

Section: Introductionmentioning

confidence: 99%

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Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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This thesis focuses on the controlled assembly of monodisperse polymer colloids into ordered two-dimensional arrangements. These assemblies, commonly referred to as colloidal monolayers, are subsequently used as masks for the generation of arrays of complex metal nanostructures on solid substrates.The motivation of the research presented here is twofold. First, monolayer crystallization methods were developed to simplify the assembly of colloids and to produce more complex arrangements of colloids in a precise way. Second, various approaches to colloidal lithography are designed with the aim to include novel features or functions to arrays of metal nanostructures.The air/water interface was exploited for the crystallization of colloidal monolayer architectures as it combines a two-dimensional confinement with a high lateral mobility of the colloids that is beneficial for the creation of high long range order. A direct assembly of colloids is presented that provides a cheap, fast and conceptually simple methodology for the preparation of ordered colloidal monolayers. The produced two-dimensional crystals can be transformed into nonclose-packed architectures by a plasma-induced size reduction step, thus providing valuable masks for more sophisticated lithographic processes. Finally, the controlled co-assembly of binary colloidal crystals with defined stoichiometries on a Langmuir trough is introduced and characterized with respect to accessible configurations and size ratios.Several approaches to lithography are presented that aim at introducing different features to colloidal lithography. First, using metal-complex containing latex particles, the synthesis of which is described as well, symmetric arrays of metal nanoparticles can be created by controlled combustion of the organic material of the colloids. The process does not feature an inherent limit in nanoparticle size and is able to produce complex materials as will be demonstrated for FePt alloy particles. Precise control over both size and spacing of the particle array is presented.Second, two lithographic processes are introduced to create sophisticated nanoparticle dimer units consisting of two crescent shaped nanostructures in close proximity; essentially by using a single colloid as mask to generate two structures simultaneously. Strong coupling processes of the parental plasmon resonances of the two objects are observed that are accompanied by high near-field enhancements. A plasmon hybridization model is elaborated to explain all polarization dependent shifts of the resonance positions. Last, a technique to produce laterally patterned, ultra-flat substrates without surface topographies by embedding gold nanoparticles in a silicon dioxide matrix is applied to construct robust and re-usable sensing architectures and to introduce an approach for the nanoscale patterning of solid supported lipid bilayer membranes.

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Section: Colloidal Lithographymentioning

confidence: 99%

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

Section: Characterization Of the Crescent Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Patterning with Colloidal Monolayers

Vogel

2012

Springer Theses

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Transformation Optics for Plasmonics

Aubry

Pendry

2013

Active Plasmonics and Tuneable Plasmonic Metamaterials

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Near‐Field Lithography by Two‐Photon Induced Photocleavage of Organic Monolayers

Álvarez¹,

Best²,

Unger³

et al. 2010

Adv Funct Materials

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We prove that the enhanced electromagnetic near-fi eld around metallic nanostructures can be used for localized two-photon-induced activation of surfaces, obtaining a defi ned chemical pattern with nanometric resolution. Gold nanoparticles (Au-NP) are deposited on glass slides that were modifi ed with a polysiloxane layer containing a nitroveratrylcarbonyl (NVoc) photoremovable group. Upon illumination with a femtosecond laser, the NVoc entity is removed. Due to the electromagnetic fi eld enhancement of the nanoparticles, the threshold of this process is lowered in the nm-scale vicinity of the metal structures. Upon cleavage, an amine functional group is released, which can be used to site-selectively bind species with complementary chemical functionality on the surface. This method can be utilized for sub-wavelength chemical structuring.

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Tuning resonances on crescent-shaped noble-metal nanoparticles

Cited by 102 publications

References 31 publications

Surface Patterning with Colloidal Monolayers

Surface Patterning with Colloidal Monolayers

Transformation Optics for Plasmonics

Near‐Field Lithography by Two‐Photon Induced Photocleavage of Organic Monolayers

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