Plasmonic and non‐plasmonic layered structures for cloaking applications at visible frequencies

Tricarico, S; Bilotti, Filiberto; Vegni, Lucio

doi:10.1002/mop.24718

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…There are other options like the cancellation of the radiation scattered by the object through suitable envelopes [88] and the use of local anomalous resonances [62,63,86,90]. As a way to make three-dimensional objects invisible, cloaking relies heavily on 3D metamaterials [34,35] although the idea of wrapping would only call for a sufficiently thick foil.…”

Section: Transformation Optics Cloaking Illusion Optics and Opticamentioning

confidence: 99%

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3D THz metamaterials from micro/nanomanufacturing

Moser

Rockstuhl

2011

Laser & Photonics Reviews

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Metamaterials are engineered composite materials offering unprecedented control of wave propagation. Despite their complexity, effective properties can frequently be extracted by conceptualizing them as homogeneous and isotropic media with dispersive electric permittivity and magnetic permeability. For an ideal isotropic medium, strong dispersion in these properties causes wave and field vectors to form a left-handed (E,H,k)-frame involving backward waves, and offering control of quantities like the refractive index which may become negative. Experimental evidence exists from microwaves to the visible. Applications include sub-wavelength-resolution imaging, invisibility cloaking, plasmonics-based lasers, metananocircuits, and omnidirectional absorbers. As the engineered sub-structures must be smaller than their design wavelength, micro/nanomanufacturing is exploited from primary pattern generation over lithography to templating and molecular beam epitaxy. 3D metamaterials have been made by stacking of layers, multilayer structuring, and 3D primary pattern generation. Theory shows that full properties may build up over one or a very few layers.

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Section: Transformation Optics Cloaking Illusion Optics and Opticamentioning

confidence: 99%

“…Examples in which the cloaking is based on the principle of cancelling of the radiation scattered by the object were studied by Tricarico et al [88] and Pendry [91] (Fig. 9).…”

Section: Review Articlementioning

confidence: 99%

3D THz metamaterials from micro/nanomanufacturing

Moser

Rockstuhl

2011

Laser & Photonics Reviews

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Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances

Huang

Zhu

Liu

et al. 2015

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Colloidal metal nanocrystals with strong, stable, and tunable localized surface plasmon resonances (SPRs) could be useful in a corrosive environment for many applications including field-enhanced spectroscopies, plasmon-mediated catalysis, etc. Here, a new synthetic strategy is reported that enables the epitaxial growth of a homogeneously alloyed AuAg shell on Au nanorod seeds, circumventing the phase segregation of Au and Ag encountered in conventional synthesis. The resulting core-shell structured bimetallic nanorods (AuNR@AuAg) have well-mixed Au and Ag atoms in their shell without discernible domains.This degree of mixing allows AuNR@AuAg to combine the high stability of Au with the superior plasmonic activity of Ag, thus outperforming seemingly similar nanostructures with monometallic shells (e.g., Ag-coated Au NRs (AuNR@Ag) and Au-coated Au NRs (AuNR@Au)). AuNR@AuAg is comparable to AuNR@Ag in plasmonic activity, but that it is markedly more stable towards oxidative treatment. Specifically, AuNR@AuAg and 2 AuNR@Ag exhibit similarly strong signals in surface-enhanced Raman spectroscopy (SERS) that are some 30-fold higher than that of AuNR@Au. When incubated with a H2O2 solution (0.5 M), the plasmonic activity of AuNR@Ag immediately and severely decayed, whereas AuNR@AuAg retained its activity intact. Moreover, the longitudinal SPR frequency of AuNR@AuAg can be tuned throughout the red wavelengths (~620-690 nm) by controlling the thickness of the AuAg alloy shell. Our synthetic strategy is versatile to fabricate AuAg alloyed shells on different shaped Au, with prospects for new possibilities in the synthesis and application of plasmonic nanocrystals.

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Plasmonic and non‐plasmonic layered structures for cloaking applications at visible frequencies

Cited by 2 publications

References 11 publications

3D THz metamaterials from micro/nanomanufacturing

3D THz metamaterials from micro/nanomanufacturing

Fabricating a Homogeneously Alloyed AuAg Shell on Au Nanorods to Achieve Strong, Stable, and Tunable Surface Plasmon Resonances

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