Nanoscale investigation of light-matter interactions mediated by magnetic and electric coupling

Burresi, Matteo

doi:10.3990/1.9789036528764

Cited by 5 publications

(9 citation statements)

References 134 publications

(269 reference statements)

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“…[17][18][19] However, since the spatial gradient of the axial component, that is, the z-component, of the electric field just above the fishnet structure is larger than in previously investigated photonic structures, [17][18][19] we expect that this component is also collected. 20 More information can be found in the Supporting Information. Following these expectations, we calculated the total field collected by the probe taking into account both the transverse component and the gradient of the axial component.…”

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Negative-Index Metamaterials: Looking into the Unit Cell

et al. 2010

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With their potential for spectacular applications, like superlensing and cloaking, metamaterials are a powerful class of nanostructured materials. All these applications rely on the metamaterials acting as a homogeneous material. We investigate a negative index metamaterial with a phase-sensitive near-field microscope and measure the optical phase as a function of distance. Close to the metamaterial we observe extremely large spatial phase variations within a single unit cell which vanish on a 200 nm length scale from the sample. These deviations of a state-of-the-art metamaterial from a homogeneous medium can be important for nanoscale applications.KEYWORDS Near-field optics, nanophotonics, metamaterials, negative refractive index T he optical properties of "natural" bulk materials arise from a complex interplay between the electronic orbitals of the constituent atoms, which leads to a certain electronic band structure. An externally applied light field interacts with electrons in this band structure. In general, this results in a dispersion of the refractive index and also leads to absorption-edges and even to sharp Lorentz-like absorption lines. Thus a natural material can be considered as an effective medium in which the role of the individual atoms no longer has to be considered. 1 Similarly in the field of metamaterials, 2 we like to think in terms of constituent "meta-atoms" that couple with each other to give rise to the optical properties of the bulk material, which is then considered as an effective medium. 3 Several important experiments have been performed to elucidate the interplay between the meta-atoms that constitute a metamaterial. For instance, the response of a single meta-atom was measured and compared with that of an array of meta-atoms. 4 Also, the response of an array of metaatoms was studied as a function of the periodicity in two directions, to extract both the electric as well as the magnetic coupling between the meta-atoms. 5,6 By now, it is well understood that, as in the case of natural materials, the effective optical properties of a metamaterial are not simply the addition of its constituent meta-atoms, and a monolayer of a metamaterial has not yet developed all the optical properties of the bulk metamaterial. As a result, the properties of a monolayer of meta-atoms that we study in this letter are not necessarily the same as those of a bulk material. 7 Nevertheless, here we use the notion "negative-index metamaterial" for a monolayer to connect to a very large number of corresponding publications.To fully understand how negative index metamaterials can be applied on the nanoscale as in, for instance, a nearfield superlens, 8 it is not sufficient to know the effective medium response of the material that is measured far away from the structure, that is, in the far field. For nanoscale applications, it is crucial to also know the near-field behavior. Hence, we would like to take a look inside the unit cell of a negative index metamaterial. A recent pioneering effort gained ...

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Negative-Index Metamaterials: Looking into the Unit Cell

et al. 2010

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“…For small perturbations we will treat the split-wire nanoantenna as if the gap region is a nanocavity. The optical response of photonic crystal nanocavities under small perturbations has been investigated by using metallic and/or dielectric near-field probes both theoretically [185] and experimentally [186,187]. We use the same methodology to describe the behavior of the split-wire nanoantennas.…”

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confidence: 99%

“…We use the same methodology to describe the behavior of the split-wire nanoantennas. According to the perturbation theory, while neglecting the magnetic contribution [188,189], the wavelength shift in terms of the load in the gaps can be written as [187] ∆λ…”

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confidence: 99%

Fabrication of plasmonic nanostructures with electron beam induced deposition

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“…(B) shows a SEM micrograph of a near-field aperture probe used in our experiments. (C) a cartoon depicting the electric field distributions of a dipole oriented in the x and z direction, showing that only in-plane dipoles can be detected by the near-field probe (inspired by [72]).…”

Section: Near-field Microscopymentioning

confidence: 99%

“…In order to simultaneously measure both orthogonal polarizations near a sample surface, the setup of Figure 2.5 is slightly altered (see Figure 2.6). A polarizing beam splitter cube is added in the detection scheme, and instead of one, now two photo diodes and lock-in amplifiers are used [72,78]. A half-wave plate (λ/2) is added to the reference branch, which is used to equally distribute the reference beam to both the detectors.…”

Section: Polarization Resolved Detectionmentioning

confidence: 99%

Antennas for light and plasmons

Dikken

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Nanoscale investigation of light-matter interactions mediated by magnetic and electric coupling

Cited by 5 publications

References 134 publications

Negative-Index Metamaterials: Looking into the Unit Cell

Negative-Index Metamaterials: Looking into the Unit Cell

Fabrication of plasmonic nanostructures with electron beam induced deposition

Antennas for light and plasmons

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