Electrically controlled optical bandgap in a structurally chiral material

Reyes, J. A.; Lakhtakia, Akhlesh

doi:10.1016/j.optcom.2005.08.034

Cited by 37 publications

(31 citation statements)

References 13 publications

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“…The circular Bragg phenomenon is robust enough that periodic perturbations of the basic helical nonhomogeneity can be altered to obtain different polarization-sensitive characteristics [10][11][12][13]. Furthermore, it can be controlled piezoelectrically [14] as well as electro-optically [15].…”

Section: Introductionmentioning

confidence: 99%

Light pressure on chiral sculptured thin films and the circular Bragg phenomenon

Ross

Lakhtakia

2008

Optik

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Section: Introductionmentioning

confidence: 99%

Light pressure on chiral sculptured thin films and the circular Bragg phenomenon

Ross

Lakhtakia

2008

Optik

Self Cite

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“…Hence, they can be solved in terms of where e x (z), e y (z), h x (z) and h y (z) are the transverse components of the electromagnetic fields. Using the Oseen transformation and following a very well known procedure [13], it can be established that w(z) satisfies:…”

Section: Optical Modesmentioning

confidence: 99%

Defect Mode in Axially Deformed Cholesteric Elastomers

Palomares

Reyes

2011

Molecular Crystals and Liquid Crystals

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We consider an axially elongated (or stretched) cholesteric elastomer, prolate or oblate, containing a spaceless twist defect. We show that the wavelength of its localized mode can be tuned by either axially compressing (or enlarging) the elastomer or by changing its pitch. We calculate the dwell time given by the inverse relative line width and exhibit that it is enhanced when the values of the deformation and pitch are near a locus in the parameter's sample that we call the pseudo-isotropic curve. We also show the density of states diverges in the pseudo-isotropic curve.

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“…Section II describes the formulation and the solution of the boundary-value problem of reflection and transmission of a normally incident plane wave by a finite number of bilayers with properties described in the previous paragraph. We use a 2 Â 2-matrix approach without any approximation [26][27][28] or homogenization. [12][13][14] Section III presents numerical results showing that enhancement of anisotropy can indeed be achieved by appropriately selecting the parameters of the finitely thick periodic multilayer.…”

Section: Introductionmentioning

confidence: 99%

Giant enhancement of the controllable in-plane anisotropy of biased isotropic noncentrosymmetric materials with epsilon-negative multilayers

Valagiannopoulos

Tsitsas

Lakhtakia

2017

Journal of Applied Physics

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Effects of photon reabsorption phenomena in confocal micro-photoluminescence measurements in crystalline silicon J. Appl. Phys. 121, 063101063101 (2017) Giant in-plane anisotropy can be exhibited by a finitely thick periodic multilayer comprising bilayers of an isotropic noncentrosymmetric material and a non-dissipative isotropic medium of negative permittivity, when a dc electric field is applied in the thickness direction. Compared to a homogeneous layer of the noncentrosymmetric material with the same thickness as the periodic multilayer, the latter exhibits an effective in-plane anisotropy that can be three orders larger in magnitude. This enhancement gets more substantial at higher frequencies and is electrically controllable. The incorporation of dissipation reduces the enhancement of the effective in-plane anisotropy, which nevertheless remains significant. We expect the finitely thick periodic multilayer to be useful as a polarization transformer or a modulator in the terahertz regime fully controllable via external dc bias. Published by AIP Publishing. [http://dx

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Electrically controlled optical bandgap in a structurally chiral material

Cited by 37 publications

References 13 publications

Light pressure on chiral sculptured thin films and the circular Bragg phenomenon

Light pressure on chiral sculptured thin films and the circular Bragg phenomenon

Defect Mode in Axially Deformed Cholesteric Elastomers

Giant enhancement of the controllable in-plane anisotropy of biased isotropic noncentrosymmetric materials with epsilon-negative multilayers

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