The Promise of Diffractive Waveplates

Nersisyan, Sarik R.; Tabiryan, Nelson V.; Steeves, Diane M.; Kimball, Brian R.

doi:10.1364/opn.21.3.000040

Cited by 78 publications

(29 citation statements)

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“…The splitting is omitted in Eq. (13). Dashed curves for the untwisted structure correspond to o and e waves: υ(ϕ = 0) = δ.…”

Section: E Dispersion Curves and Tssmentioning

confidence: 99%

“…GP in twisted-nematic polarization phenomena [11] has application for the design of wave fronts using PancharatnamBerry phase optical elements [12,13]. Remarkably, polarizational GP is independent of the total phase, so it is used to offset the frequency of a laser beam by GP modulators, adding the mechanical rotation frequency of a quarter-half-quarter-waveplate Pancharatnam device [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Geometric phase ando-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity

et al. 2015

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Anomalous spectral shift of transmission peaks is observed in a Fabry-Pérot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix method, numerically using the accurate Berreman method, and geometrically using the generalized Mauguin-Poincaré rolling cone method. The o-mode blueshift is measured for a 4-methoxybenzylidene-4 -n-butylaniline twisted-nematic layer inside the Fabry-Pérot cavity. The twist is electrically induced due to the homeoplanar-twisted configuration transition in an ionic-surfactant-doped liquid crystal layer. Experimental evidence confirms the validity of the theoretical model.

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“…The splitting is omitted in Eq. (13). Dashed curves for the untwisted structure correspond to o and e waves: υ(ϕ = 0) = δ.…”

Section: E Dispersion Curves and Tssmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geometric phase ando-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity

et al. 2015

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“…It has been shown that the efficiency of steering to large angles (> 5 • ) with this classical approach is small (< 60 %), mainly due to inherent fringing fields [2]. Modern approaches, such as the liquid crystal polarization grating can steer light to large angles with very high efficiencies (> 99.5 %) at the cost of being limited to discrete angles [3][4][5][6][7]. The combination of both, continuous small angle steerers and large angle discrete steerers, addresses the needs for accurate steering over large angles.…”

Section: Introductionmentioning

confidence: 99%

Reflective liquid crystal hybrid beam-steerer

et al. 2016

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We report on efficient optical beam-steering using a hot-embossed reflective blazed grating in combination with liquid crystal. A numerical simulation of the electrical switching characteristics of the liquid crystal is performed and the results are used in an FDTD optical simulator to analyze the beam deflection. The corresponding experiment on the realized device is performed and is found to be in good agreement. Beam deflection angles of 4.4 • upon perpendicular incidence are found with low applied voltages of 3.4 V. By tilting the device with respect to the incoming optical beam it can be electronically switched such that the beam undergoes either total internal reflection or reflection with a tunable angle.

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“…Liquid crystals (LCs) are widely used for optical devices due to the large electro-optic modulation resulting from the high optical anisotropy, the electrically tuning capability at low voltages, and the design flexibility on various substrates [1][2][3][4][5][6]. Among a number of the LC devices, the LC grating elements play an important role in many optical systems such as 3-dimentional (3D) displays, optical data storage, and optical communication systems by means of the change in the phase or the polarization state of light [2,[7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Fully continuous liquid crystal diffraction grating with alternating semi-circular alignment by imprinting

Kim¹,

Na²,

Lee³

2012

Opt. Express

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We demonstrate a fully continuous liquid crystal (LC) grating device with the alternating semi-circular alignment which exhibits the switching effect between the diffraction orders independent of the thickness of the LC cell. The continuous phase modulation in the LC grating with the rotational symmetry was achieved on a micro-imprinted surface where the semi-circular alignment of the LC was spontaneously produced. Our LC grating device in the hybrid geometry exhibited the perfect continuity of the phase retardation and the switchable diffraction with the diffraction efficiency of 44% at ±1st orders as a function of an applied voltage. It was found that the symmetry of the input polarization direction with respect to the grating patterns results in the interchange between two symmetric grating configurations.

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The Promise of Diffractive Waveplates

Cited by 78 publications

References 0 publications

Geometric phase ando-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity

Geometric phase ando-mode blueshift in a chiral anisotropic medium inside a Fabry-Pérot cavity

Reflective liquid crystal hybrid beam-steerer

Fully continuous liquid crystal diffraction grating with alternating semi-circular alignment by imprinting

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