Emulating Nonreciprocity with Spatially Dispersive Metasurfaces Excited at Oblique Incidence

Pfeiffer, Carl; Grbic, Anthony

doi:10.1103/physrevlett.117.077401

Cited by 32 publications

(24 citation statements)

References 42 publications

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“…The interconversion between longitudinal and transverse modes has been exploited in the design of metasurfaces in order to emulate nonreciprocal phenomena in electromagnetic systems 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Tailoring one-dimensional layered metamaterials to achieve unidirectional transmission and reflection

Psiachos

Sigalas

2019

Phys. Rev. B

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We investigate elastic-wave propagation in a spatially-dispersive multilayered, totally passive metamaterial system. At oblique incidence a longitudinal (acoustic) wave can convert to transverse in the solid material comprising the layers, but when the incident wave enters the multilayer from a solid as opposed to a liquid medium, the incident transverse component supported by the solid medium indirectly causes the longitudinal transmission response to be greatly modified and similarly for the transverse wave exiting the multilayer into a solid medium in response to an incident longitudinal wave. The conversion between longitudinal and transverse waves is found to lead to the emulation of a characteristic non-reciprocal phenomenon at some frequencies: a directionality in the transmission response, sometimes simultaneously with the reflection response. The directionality can be exploited for example in the construction of antiseismic structures or breakwater structures. The inclusion of gain/loss elements can strongly enhance the directionality. Periodicity-breaking defects can cause a great variability in the response, enabling the use of devices based on this phenomenon as sensors.

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“…The interconversion between longitudinal and transverse modes has been exploited in the design of metasurfaces in order to emulate nonreciprocal phenomena in electromagnetic systems 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Tailoring one-dimensional layered metamaterials to achieve unidirectional transmission and reflection

Psiachos

Sigalas

2019

Phys. Rev. B

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“…This asymmetry of transmission at θ = π/2 − θ 0 and θ = 3π/2 + θ 0 was studied in [2] as a property enabled by nonzero normal polarizations induced in the metasurface inclusions. Let us show that the same properties can be realized…”

Section: Example Of Equivalent Tangential Polarizationsmentioning

confidence: 99%

“…We consider example metasurfaces which have interesting asymmetric properties due to the presence of normal polarizations (like the structures discussed in [2]) and show that it is in fact possible to realize the same response using equivalent metasurfaces which support only tangential polarizations. Finally, we discuss practical advantages and disadvantages of metasurfaces of both types.…”

Section: Introductionmentioning

confidence: 99%

“…Although metasurfaces have a finite thickness and polarizations normal to the surface are also induced, it appears that their role on the metasurface performance is not yet properly understood. In an interesting recent paper [2] it is stated that "adding longitudinal (normal) surface currents significantly expands the scope of electromagnetic phenomena that can be engineered with reciprocal materials". This is a very counter-intuitive conclusion, since it is generally believed that setting only tangential currents is enough to fully control the reflected and transmitted fields, and here we consider this issue in due detail.…”

Section: Introductionmentioning

confidence: 99%

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Functional metasurfaces: Do we need normal polarizations?

Tretyakov

Kwon

Albooyeh

et al. 2017

2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)

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We consider reciprocal metasurfaces with engineered reflection and transmission coefficients and study the role of normal (with respect to the metasurface plane) electric and magnetic polarizations on the possibilities to shape the reflection and transmission responses. We demonstrate in general and on a representative example that the presence of normal components of the polarization vectors does not add extra degrees of freedom in engineering the reflection and transmission characteristics of metasurfaces. Furthermore, we discuss advantages and disadvantages of equivalent volumetric and fully planar realizations of the same properties of functional metasurfaces.

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“…The transmission coefficients, T Rx (ω, θ, φ) and T Lx (ω, θ, φ) of each individual are analytically calculated for normal and oblique angles of incidence using expressions provided in the supplementary material of [19]. The individuals with lowest cost are selected from the population, randomly mutated, and the process is repeated.…”

Section: Cascaded Waveplate Polarizermentioning

confidence: 99%

Linear-to-Circular Polarizers for Multi-Octave Bandwidths and Wide Scan Angles at Mm-Wave Frequencies Using Rotated Anisotropic Layers

Pfeiffer¹,

Tomasic²

2017

PIER C

Self Cite

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Abstract-Linear-to-circular polarizers operating from roughly 17 to 65 GHz, and angles of incidence up to 60 • are reported. These polarizers convert incident linearly polarized radiation into circular polarization upon transmission. First, previous designs inspired by the optics community using cascaded waveplates are scaled down to mm-wave frequencies. The naturally occurring anisotropic crystals that the optics community employed are replaced here with metamaterials. The range of incidence angles is improved by utilizing biaxial artificial dielectrics whose permittivity in the x, y and z directions are all engineered. Next, an ultra-wideband linear-to-circular polarizer consisting of cascaded sheet impedances is reported. The cascaded sheet impedance polarizer utilizes a combination of meanderline and metallic patch geometries. The principal axes of each patterned metallic sheet are oriented at an optimized angle, which increases the design degrees of freedom and performance. This polarizer has the advantages of being thinner and easier to fabricate than the polarizer utilizing cascaded waveplates, but is more difficult to design. Both polarizers rely heavily on genetic algorithm optimization in the design process to realize multiple octaves of bandwidths and robust performance at wide angles of incidence. The polarizers are fabricated with commercial printed-circuit-boards and then experimentally characterized.

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Emulating Nonreciprocity with Spatially Dispersive Metasurfaces Excited at Oblique Incidence

Cited by 32 publications

References 42 publications

Tailoring one-dimensional layered metamaterials to achieve unidirectional transmission and reflection

Tailoring one-dimensional layered metamaterials to achieve unidirectional transmission and reflection

Functional metasurfaces: Do we need normal polarizations?

Linear-to-Circular Polarizers for Multi-Octave Bandwidths and Wide Scan Angles at Mm-Wave Frequencies Using Rotated Anisotropic Layers

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