Optical wave parameters for spatially dispersive and anisotropic nanomaterials

Shevchenko, Andriy; Nyman, M.; Kivijärvi, Ville; Kaivola, Matti

doi:10.1364/oe.25.008550

Cited by 5 publications

(12 citation statements)

References 29 publications

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“…We assume that the wave parameters, such as the refractive index n i and impedance Z i are known for all possible directions of propagation in medium 1 (i = 1) and medium 2 (i = 2). Note that this information is enough to fully characterize optical properties of any anisotropic and spatially dispersive material with higher-order multipole excitations in its structural units [17,18]. In some cases, however, when strong evanescent-wave coupling is present between the metamaterial layers, the wave parameters can yield inaccurate calculation results [15][16][17][18].…”

Section: Theorymentioning

confidence: 99%

“…To make our results independent of polarization, we introduce a tangential impedance, defined as [18] …”

Section: Theorymentioning

confidence: 99%

“…The tangential transmission and reflection coefficients of the interface are defined as τ 12 = E t,tr /E i,tr and ρ 12 = E r,tr /E i,tr , where E j,tr denotes the tangential component of the field E j . The coefficients are given by [18] …”

Section: Theorymentioning

confidence: 99%

“…We assume a refractive index n = 1.5 for glass and take the refractive index spectrum of Ag from [22]. Then, we use the wave parameter retrieval method of [18] to determine the refractive index and impedance for waves in the metamaterial propagating along the z axis. Figure 2(b) shows the spectrum of the refractive index that resembles the spectrum of a Drude metal with a plasma frequency at λ 0 = 530 nm.…”

Section: Examplesmentioning

confidence: 99%

“…We begin by generalizing the absorbing media to include optical metamaterials. In these nanomaterials, the magnetic permeability can differ from the vacuum permeability, unlike in most other materials at optical frequencies [13,14], and the effect of spatial dispersion can be strong [15][16][17][18]. Such materials allow one to tune the refractive index and the wave impedance separately [15,16], providing more possibilities for useful applications.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fluorescence enhancement and nonreciprocal transmission of light waves by nanomaterial interfaces

2017

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In an optically absorbing or amplifying linear medium, the energy flow density of interfering optical waves is in general periodically modulated in space. This makes the wave transmission through a material boundary, as described by the Fresnel transmission coefficients, nonreciprocal and apparently violating the energy conservation law. The modulation has been previously described in connection to ordinary homogeneous nonmagnetic materials. In this work, we extend the description to nanomaterials with designed structural units that can be magnetic at optical frequencies. We find that in such a "metamaterial" the modulation in energy flow can be used to enhance optical far-field emission in spite of the fact that the material is highly absorbing. We also demonstrate a nanomaterial design that absorbs light, but simultaneously eliminates the power flow modulation and returns the reciprocity, which is impossible to achieve with a nonmagnetic material. We anticipate that these unusual optical effects can be used to increase the efficiency of nanostructured light emitters and absorbers, such as light-emitting diodes and solar cells.

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Section: Theorymentioning

confidence: 99%

“…To make our results independent of polarization, we introduce a tangential impedance, defined as [18] …”

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescence enhancement and nonreciprocal transmission of light waves by nanomaterial interfaces

2017

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Beyond local effective material properties for metamaterials

et al. 2018

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To discuss the properties of metamaterials on physical grounds and to consider them in applications, effective material parameters are usually introduced and assigned to a given metamaterial. In most cases, only weak spatial dispersion is considered. It allows to assign local material properties, i.e. a permittivity and a permeability. However, this turned out to be insufficient. To solve this problem, we study here the effective properties of metamaterials with constitutive relations beyond a local response and take strong spatial dispersion into account. The isofrequency surfaces of the dispersion relation are investigated and compared to those of an actual metamaterial. The significant improvement provides evidence for the necessity to use nonlocal material laws in the effective description of metamaterials. The general formulation we choose here renders our approach applicable to a wide class of metamaterials.

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Theoretical description and design of nanomaterial slab waveguides: application to compensation of optical diffraction

Kivijärvi¹,

Nyman²,

Shevchenko³

et al. 2018

Opt. Express

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Planar optical waveguides made of designable spatially dispersive nanomaterials can offer new capabilities for nanophotonic components. As an example, a thin slab waveguide can be designed to compensate for optical diffraction and provide divergence-free propagation for strongly focused optical beams. Optical signals in such waveguides can be transferred in narrow channels formed by the light itself. We introduce here a theoretical method for characterization and design of nanostructured waveguides taking into account their inherent spatial dispersion and anisotropy. Using the method, we design a diffraction-compensating slab waveguide that contains only a single layer of silver nanorods. The waveguide shows low propagation loss and broadband diffraction compensation, potentially allowing transfer of optical information at a THz rate.

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Optical wave parameters for spatially dispersive and anisotropic nanomaterials

Cited by 5 publications

References 29 publications

Fluorescence enhancement and nonreciprocal transmission of light waves by nanomaterial interfaces

Fluorescence enhancement and nonreciprocal transmission of light waves by nanomaterial interfaces

Beyond local effective material properties for metamaterials

Theoretical description and design of nanomaterial slab waveguides: application to compensation of optical diffraction

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