2019
DOI: 10.1103/physrevlett.122.213201
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Chiral Metamaterials with PT Symmetry and Beyond

Abstract: Optical systems with gain and loss that respect Parity-Time (PT) symmetry can have real eigenvalues despite their non-Hermitian character. Chiral systems impose circularly polarized waves which do not preserve their handedness under the combined space-and time-reversal operations and, as a result, seem to be incompatible with systems possessing PT symmetry. Nevertheless, in this work we show that in certain configurations, PT symmetric permittivity, permeability and chirality is possible; in addition, real eig… Show more

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Cited by 48 publications
(30 citation statements)
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“…Non-Hermiticity has also shown remarkable performance in manipulating circularly polarized wave using, for example, anisotropic metasurfaces with mirror symmetry [39]. The feature of polarization control could also be combined with nonreciprocity to achieve unidirectional polarization conversion [40,41]. As shown in Fig.…”
Section: Non-hermitian Metasurfacesmentioning
confidence: 99%
“…Non-Hermiticity has also shown remarkable performance in manipulating circularly polarized wave using, for example, anisotropic metasurfaces with mirror symmetry [39]. The feature of polarization control could also be combined with nonreciprocity to achieve unidirectional polarization conversion [40,41]. As shown in Fig.…”
Section: Non-hermitian Metasurfacesmentioning
confidence: 99%
“…Refs. [19][20][21]). This is basically because a modulation such as the modulation of the complex refractive effective index in a distributed-feedback (DFB) laser diode takes in an ideal limit the simple form n eff (z) = n eff,0 + δn exp(iKz), with real part δn cos(Kz) and imaginary part δn sin(Kz) in quadrature, causing a scattering channel only for +K and none for -K, unlike classical real-index grating for instance [22,23]..…”
Section: Introductionmentioning
confidence: 99%
“…with the great potential offered by PT-symmetry. An important class of metamaterials which are highly unexplored under the concept of PT-symmetry are the so-called chiral metamaterials [26], i.e. metamaterials composed of building-blocks that cannot be superimposed with their mirror images using translations and rotations [27,35].…”
Section: Introductionmentioning
confidence: 99%