Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces

Mayer, Martín; Tebbe, Moritz; Kuttner, Christian; Schnepf, Max J.; König, Tobias; Fery, Andreas

doi:10.1039/c6fd00013d

Cited by 53 publications

(65 citation statements)

References 68 publications

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“…Such resonance spectral broadening is a well‐known phenomenon in metasurfaces due to variations of, e.g., lattice dimensions, size distribution in colloidal nanoparticle self‐assembled arrays or, as in this case, the resonator shape . First, the OPE power and phase spectra, T OPE ( f ) and φ OPE ( f ), are taken as reference.…”

Section: Resultsmentioning

confidence: 99%

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

Zografopoulos

Ferraro

Algorri

et al. 2019

Advanced Optical Materials

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properties of propagating electromagnetic waves, such as wave front, polarization, intensity, or spectrum, in ways unachievable by bulk materials of the same subwavelength thickness. [1][2][3] The constituent elements of a metasurface can be either metallic or dielectric and they are usually patterned on a low-loss, dielectric substrate. All-dielectric metasurfaces, in particular, which are composed of elements made of a high-refractive index dielectric material, have been lately attracting more attention, as they show a very high diversity of exploitable properties, while being free from ohmic losses associated with the presence of metals. [4] The potential of dielectric metasurfaces as a platform for low-loss, compact, functional components has been extensively demonstrated in numerous applications, such as reflection/refraction control and wave-front shaping, [5][6][7][8] lensing, [9] control of light emission [10,11] or photoluminescence, [12,13] polarization control [14,15] and polarimetry, [16] generation of vortex beams, [17] highly selective filtering, [18,19] or enhancement of nonlinear processes. [20,21] In addition to offering novel solutions in practical applications, metasurfaces can also provide insight in theoretical physics, optics, and the investigation of phenomena based on particular light-matter interaction conditions. One such case is that of toroidal modes, which have been under intense investigation, thanks to their unusual electromagnetic properties. The toroidal dipole, the simplest toroidal mode, is generated by a current flowing in a solenoid, which is bent into a torus. Under certain conditions, the excitation of the toroidal dipole can interfere destructively with the electric dipole mode and cancel the far-field scattering radiation of dielectric particles, in the so-called "anapole" state. [22] Since decades ago, toroidal modes were employed in physics, for instance, to explain the parity violation of the weak interactions in atomic nuclei, [23] to propose models of stable atoms, [24] or to describe dark matter. [25] In recent years, though, the interest on electromagnetic toroidal moments is rapidly increasing as, apart from the fundamental physical insight, they can be harnessed in numerous applications. [26,27] Toroidal modes in individual dielectric particles or small clusters have been theoretically proposed for the excitation of toroidal response, [28] cloaking, [29] enhanced absorption, [30] and nanolasing [31] or experimentally demonstrated as nonradiating sources [32] and for the enhancement of nonlinear effects. [33,34] Moreover, it A single-layer, all-dielectric metasurface exhibiting a strong toroidal resonance in the low-atmospheric loss radio window of the subterahertz W-band is theoretically proposed and experimentally demonstrated. The metasurface is fabricated on a high-resistivity floating-zone silicon wafer by means of a singleprocess, wet anisotropic etching technique. The properties of the toroidal mode of both the constituent dielectric elements and the metasur...

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Section: Resultsmentioning

confidence: 99%

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

Zografopoulos

Ferraro

Algorri

et al. 2019

Advanced Optical Materials

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“…(e) Extinction spectra of the monolayer shown in (d) with varying polarization angle of the incident linearly polarized light with respect to the particle lines (illustrated in the inset scheme). (f) SEM image along with photographs taken under illumination in reflection and transmission of gold nanorods in single particle lines on gold‐coated glass substrates obtained through wrinkle‐assisted assembly . (g) Measured extinction (red) of the sample presented in (f) along with a spectrum simulated with FDTD (blue) and the calculated transversal spectrum of an isolated nanorod (black).…”

Section: Radiative Plasmonic Coupling In Colloidal Monolayersmentioning

confidence: 99%

“…Hence, this example shows a very strong polarization dependence with a resonance coupling strength that can be selectively addressed by changing the polarization angle. Extending the concept of wrinkle‐assisted assembly for the fabrication of anisotropic plasmonic monolayers, Mayer et al have very recently succeeded to prepare macroscopic magnetic metasurfaces using gold nanorods . Here, gold nanorods with a length of 161 nm and diameter of 30 nm were assembled in linear supersturtures on glass with a smooth and thin gold film of less than 1 nm surface roughness.…”

Section: Anisotropic Plasmonic Coupling In Colloidal Monolayersmentioning

confidence: 99%

“…An on‐going challenge in plasmon coupling applications is building well‐ordered plasmonic superstructures that take advantage of the unique optical properties of wet‐chemically synthesized building blocks. Recent improvements in colloidal self‐assembly are allowing the facile fabrication of two‐dimensional monolayers of plasmonic building blocks . With colloidal self‐assembly, one can capitalize on the unique structural and compositional flexibility offered by readily available synthesis strategies while arriving at the structural diversity offered by self‐assembly .…”

Section: Introductionmentioning

confidence: 99%

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Plasmon resonance coupling phenomena in self-assembled colloidal monolayers

Fitzgerald

Karg

2017

Phys. Status Solidi A

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Colloidal self‐assembly merges the flexibility provided by (wet‐chemical) colloid synthesis and the structural diversity offered by self‐assembly. Using plasmonic nanocrystals as colloidal building blocks, this enables the fabrication of plasmonic superstructures that show optical response superior to the individual colloid properties. In this review, we highlight recent examples of colloidal monolayers featuring coupled plasmonic resonances. Depending on the average inter‐particle distance and the structure of such monolayers, the discussed examples show either near‐field or radiative coupling signatures depending on the critical interference length scale of the localized resonances. In addition, templated assembly is highlighted as a pathway for the preparation of monolayers that show anisotropic optical coupling. The collected works not only reflect the recent state of the art in plasmonic resonance engineering in self‐assembled monolayers, but also point to future directions relevant for their use in nanophotonic applications such as plasmonic lasing.

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“…In general, the process to gain crack-free wrinkles can be utilized in all wrinkled surfaces that are desired to be uniform, which is relevant to most practical applications. Those are for example the template-assisted selfassembly (TASA) system as used by us, 16,44 grating structures for photons, 45 anti-fouling surfaces [46][47][48] as well as surface films that additionally act as barrier layers for the surrounding media.…”

Section: Introductionmentioning

confidence: 99%