Selection strategy for circular-polarization-sensitive rejection characteristics of electro-optic ambichiral Reusch piles

Dixit, Mukul; Lakhtakia, Akhlesh

doi:10.1016/j.optcom.2008.06.059

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…It has been shown theoretically that the CBP is also exhibited for oblique incidence by cholesteric LCs [27], chiral smectic LCs [28,29], chiral STFs [30,31], and Reusch piles [32]. Additional spectral regimes of high reflectance can appear for oblique incidence, but are generally much weaker [27,30,33] and do not appear to be of technological importance.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of circular Bragg phenomenon for oblique incidence

2015

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A 20-period-thick chiral sculptured thin film (STF) of zinc selenide was fabricated on a glass slide by thermal evaporation. A variable-angle spectroscopic system was devised and used to measure all eight of the circular remittances of the chiral STF as functions of the angle of incidence and the free-space wavelength. Thereby, the center wavelength and the bandwidth of the circular Bragg phenomenon exhibited by structurally chiral materials such as cholesteric liquid crystals and chiral STFs were comprehensively characterized for incidence angles in the range [0°,70°]. The experimental data were qualitatively compared with data calculated using a helicoidal model for the relative permittivity dyadic of the chiral STF, and assuming that all three eigenvalues of that dyadic obey the single-resonance Lorentz model. The chosen representation was found adequate to represent the blue shift of the centerwavelength with an increasing angle of incidence, but the Lorentz model requires modification to develop improved predictive capabilities.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of circular Bragg phenomenon for oblique incidence

2015

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“…This solution defines therefore a quasi-localized defect mode with defect frequency x d [7]. If the chiral discontinuity angle is p=2, the peak generated by this defect is located at the central wavelength of the Bragg regime [15]: k ¼ (k 1 þ k 2 )=2 whose band width is: Dk k 1 Àk 2 .…”

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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“…As DSCMs exhibit the circular Bragg phenomenon, their circular reflectances and transmittances for normal incidence have been of major interest for both theorists and experimentalists for several decades [14]. Theoretical results for oblique incidence have also been published [36][37][38][39][40][41][42], but experimental data for oblique incidence are rare and incomprehensive [36,[42][43][44][45][46][47]. Although spectrums of the circular reflectances and transmittances over wide ranges of both λ 0 and θ inc have recently been published [21,48], we provide calculated values of R L , R R , T L , and T R as functions of λ 0 and θ inc in Fig.…”

Section: Circular Reflectances and Transmittancesmentioning

confidence: 99%

Experimental and theoretical investigation of the co-occurrence of linear and circular dichroisms for oblique incidence of light on chiral sculptured thin films

McAtee

Lakhtakia

2018

J. Opt. Soc. Am. A

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Theory shows that a slab of a dielectric structurally chiral material (DSCM) exhibits both linear and circular dichroisms because of its anisotropy and structural chirality, for normal as well as oblique incidence. This conclusion was confirmed by fabricating a chiral sculptured thin film and measuring the spectra of its reflectances and transmittances, both linear and circular. Signatures of the circular Bragg phenomenon are evident in the spectra of all reflectances, transmittances, absorptances, and dichroisms. Reversal of the structural handedness of a DSCM and rotation of the projection of the direction of propagation of the incident light clockwise instead of counterclockwise about the axis of helicoidal nonhomogeneity simultaneously changes the sign of circular dichroism but has no effect on linear dichroism.

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Selection strategy for circular-polarization-sensitive rejection characteristics of electro-optic ambichiral Reusch piles

Cited by 12 publications

References 20 publications

Experimental investigation of circular Bragg phenomenon for oblique incidence

Experimental investigation of circular Bragg phenomenon for oblique incidence

Defect Mode in Axially Deformed Cholesteric Elastomers

Experimental and theoretical investigation of the co-occurrence of linear and circular dichroisms for oblique incidence of light on chiral sculptured thin films

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