34.4L: <i>Late‐News Paper</i>: Polarization Independent Projection Systems Using Thin Film Polymer Polarization Gratings and Standard Liquid Crystal Microdisplays

Komanduri, Ravi K.; Oh, Chulwoo; Escuti, Michael J.

doi:10.1889/1.3256822

Cited by 21 publications

(8 citation statements)

References 19 publications

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“…Optical gratings are central components of diffractive optical elements (DOEs) that are used in various optical devices to manipulate optical beams in order to create a desired far-field intensity profile of the beam. They can affect the amplitude as well as the phase of an optical field [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. One of their advantageous properties is tunability, which can be obtained by the application of external stimuli, such as electric [ 4 , 10 , 11 , 12 , 13 ], magnetic [ 14 , 15 , 16 , 17 ], and mechanical or optical fields [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

2020

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We present a theoretical analysis of optical diffractive properties of magnetically tunable optical transmission gratings composed of periodically assembled layers of a polymer and a ferromagnetic liquid crystal (LC). The orientational structure of the LC layers as a function of an applied magnetic field is calculated by minimization of the Landau-de Gennes free energy for ferromagnetic LCs, which is performed numerically and also analytically by using the one-constant approximation and the approximations of the high and the low magnetic fields. Optical diffractive properties of the associated diffraction structure are calculated numerically in the framework of rigorous coupled-wave analysis (RCWA). The presented methodology provides a basis for designing new types of diffractive optical element based on ferromagnetic LCs and simulating their operation governed by the in-plane magnetic field.

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Section: Introductionmentioning

confidence: 99%

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

2020

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“…Because of these advantages, their potential applications are projection-type displays [17], polarization converters [18], and Stokes polarimeters [19][20][21]. LC polarization gratings can be grouped into two categories: the homogeneous or hybrid orientation-based grating and the twisted nematic (TN) orientation-based one.…”

Section: Introductionmentioning

confidence: 99%

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Honma¹,

Nose²

2012

Opt. Express

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We propose a liquid crystal (LC) polarization grating that conserves the polarization state of incident light, wherein the variation range of the twist angle is 2π. The design scheme for theoretically 100% diffraction efficiency of the first-diffraction order is derived, and a prototype LC grating is evaluated. Under zero voltage, the fabricated LC grating exhibits high efficiency of the first-order diffraction, validating the proposed design scheme. The high efficiency of the second-order diffraction can also be achieved under a high voltage so that the LC director in the midplane is vertical to the substrate plane. The circular polarization sense of the second-order diffraction is identical to that of the incident light as in the case of the first-order diffraction. This grating functions as a beam deflector, steering the input beam in three different directions (zeroth-, first-, and second-order diffractions) by adjusting the applied voltage.

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“…Various optical devices use diffractive optical elements (DOEs) to create a desired spatial profile of the optical field. Most DOEs are transparent surface relief microstructures that can affect either the amplitude or the phase of optical radiation passing through them [ 2 , 3 , 4 , 5 , 6 ]. They are standard in use as diffusers [ 7 ], beam splitters [ 8 ], beam samplers [ 9 ], beam shapers [ 10 ], axicons [ 11 ], vortex phase plates [ 12 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Electrically Tuneable Optical Diffraction Gratings Based on a Polymer Scaffold Filled with a Nematic Liquid Crystal

et al. 2021

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We present an experimental and theoretical investigation of the optical diffractive properties of electrically tuneable optical transmission gratings assembled as stacks of periodic slices from a conventional nematic liquid crystal (E7) and a standard photoresist polymer (SU-8). The external electric field causes a twist-type reorientation of the LC molecules toward a perpendicular direction with respect to initial orientation. The associated field-induced modification of the director field is determined numerically and analytically by minimization of the Landau–de Gennes free energy. The optical diffraction properties of the associated periodically modulated structure are calculated numerically on the basis of rigorous coupled-wave analysis (RCWA). A comparison of experimental and theoretical results suggests that polymer slices provoke planar surface anchoring of the LC molecules with the inhomogeneous surface anchoring energy varying in the range 5–20 μJ/m2. The investigated structures provide a versatile approach to fabricating LC-polymer-based electrically tuneable diffractive optical elements (DOEs).

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34.4L: Late‐News Paper: Polarization Independent Projection Systems Using Thin Film Polymer Polarization Gratings and Standard Liquid Crystal Microdisplays

Cited by 21 publications

References 19 publications

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Electrically Tuneable Optical Diffraction Gratings Based on a Polymer Scaffold Filled with a Nematic Liquid Crystal

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