Reversal of Circular Bragg Phenomenon in Ferrocholesteric Materials with Negative Real Permittivities and Permeabilities

Lakhtakia, Akhlesh

doi:10.1002/1521-4095(20020318)14:6<447::aid-adma447>3.0.co;2-c

Cited by 9 publications

(11 citation statements)

References 20 publications

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“…as its center-wavelength. This equation must also hold if both the relative permittivity and the relative permeability dyadics are negative definite (i.e., ǫ a,b,c < 0 and µ a,b,c < 0) [24,25]. Even when the two dyadics are indefinite, we must ensure that the ambichiral structure is electromagnetically penetrable by normally incident plane waves, in general.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Polarization-universal rejection filtering by ambichiral structures made of indefinite dielectric-magnetic materials

Lakhtakia¹

2008

Phys. Scr.

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An ambichiral structure comprising sheets of an anisotropic dielectric material rejects normally incident plane waves of one circular polarization (CP) state but not of the other CP state, in its fundamental Bragg regime. However, if the same structure is made of an dielectric-magnetic material with indefinite permittivity and permeability dyadics, it may function as a polarization-universal rejection filter because two of the four planewave components of the electromagnetic field phasors in each sheet are of the positive-phase-velocity type and two are of the negative-phasevelocity type.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Polarization-universal rejection filtering by ambichiral structures made of indefinite dielectric-magnetic materials

Lakhtakia¹

2008

Phys. Scr.

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“…The propensity of HBMs to exhibit characteristics related to negative refraction has been explored for the particular cases of chiral ferronematic materials (which are characterized by the constitutive relations in Eq. (44) with H BM and μ H BM having uniaxial forms, and the magnetoelectric dyadics ξ H BM and ζ H BM being null valued) [27] and chiral ferrosmectic materials (which are characterized by the constitutive Eqs. (44) with H BM and μ H BM having biaxial forms, and the magnetoelectric dyadics ξ H BM and ζ H BM being null valued) [28].…”

Section: Helicoidal Bianisotropic Materialsmentioning

confidence: 99%

“…The simplest materials that exhibit negative refraction are isotropic dielectric-magnetic materials [20], but the scope for exotic behavior such as negative refraction is considerably increased if chirality is introduced [21][22][23][24], especially in combination with anisotropy [25,26] or nonhomogeneity [27,28]. We confine ourselves in this review to chiral and certain related metamaterials-that too of the linear, passive kind.…”

Section: Introductionmentioning

confidence: 99%

Negatively refracting chiral metamaterials: a review

Mackay

Lakhtakia

2010

J. Photon. Energy

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Abstract. Chirality extends the class of negatively refracting metamaterials by endowing a richer palette of electromagnetic properties. Chiral metamaterials can support negative refraction, which must be assessed in light of the closely related phenomenons of negative phase velocity and counterposition. Two categories of chiral metamaterials are being examined these days: (a) homogeneous and homogenizable chiral materials, as exemplified by isotropic chiral materials, Faraday chiral materials, and materials with simultaneous mirror-conjugated and racemic chirality characteristics; and (b) structurally chiral materials, as exemplified by helicoidal bianisotropic materials and ambichiral materials. The planewave response of a half-space occupied by a chiral metamaterial is complex, and important distinctions between negative refraction, negative phase velocity, and counterposition emerge. C 2010 Society of Photo-Optical Instrumentation Engineers.

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“…In [12][13][14], periodically inhomogeneous spiral structures were considered when all components and being negative, and a change in the sign of circular polarization of the wave undergoing diffraction reflec-…”

Section: Introductionmentioning

confidence: 99%

Polarization and Diffraction Peculiarities of Optical Media Possessing Simultaneously the Properties of Right and Left Substances

et al. 2020

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With the simultaneous presence of positive and negative components both in the permittivity tensor ij and in the tensor of magnetic permeability μ ij , the propagation of an electromagnetic wave in optically homogeneous anisotropic media, and in periodically inhomogeneous media with a spiral structure is considered. It is shown that depending on polarization, such media exhibit the properties of both dextrorotatory and levorotatory substances. It is shown also that the medium with a spiral periodic structure may have the property of total diffraction reflection of the wave of any polarization. In the case of the presence of different signs of components of ij and μ ij in the spiral medium, it is revealed that two regions of diffraction reflection are formed, corresponding to the two waves with circular polarization with mutually opposite rotation of the polarization.

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Reversal of Circular Bragg Phenomenon in Ferrocholesteric Materials with Negative Real Permittivities and Permeabilities

Cited by 9 publications

References 20 publications

Polarization-universal rejection filtering by ambichiral structures made of indefinite dielectric-magnetic materials

Polarization-universal rejection filtering by ambichiral structures made of indefinite dielectric-magnetic materials

Negatively refracting chiral metamaterials: a review

Polarization and Diffraction Peculiarities of Optical Media Possessing Simultaneously the Properties of Right and Left Substances

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