Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Chen, Ran; Lee, Yun‐Han; Zhan, Tao; Yin, Kun; An, Zhongwei; Wu, Shin‐Tson

doi:10.1002/adom.201900101

Cited by 66 publications

(34 citation statements)

References 50 publications

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“…Liquid crystals (LCs) are self-assembled soft materials composed of certain anisotropic molecules with orientational orders. They respond to external stimulus such as heat, electric field, magnetic field, and light [1][2][3][4][5][6]. In the presence of an electric field, these anisotropic organic compounds with both optical and dielectric anisotropies can be reoriented, resulting in intensity and/or phase modulation.…”

Section: Introductionmentioning

confidence: 99%

Novel liquid crystal photonic devices enabled by two-photon polymerization [Invited]

He¹,

Tan²,

Chanda³

et al. 2019

Opt. Express

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In addition to displays, liquid crystals (LCs) have also found widespread applications in photonic devices, such as adaptive lens, adaptive optics, and sensors, because of their responses to electric field, temperature, and light. As the fabrication technique advances, more sophisticated devices can be designed and created. In this review, we report recent advances of two-photon polymerization-based direct-laser writing enabled LC devices. Firstly, we describe the basic working principle of two-photon polymerization. With this powerful fabrication technique, we can generate anchoring energy by surface morphology to align LC directors on different form factors. To prove this concept, we demonstrate LC alignment on planar, curvilinear surfaces as well as in three-dimensional volumes. Based on the results, we further propose a novel, ultra-broadband, twisted-nematic diffractive waveplate that can potentially be fulfilled by this technique. Next, we briefly discuss the current status of direct-laser writing on LC reactive mesogens and its potential applications. Finally, we present two design challenges: fabrication yield and polymer relaxation/deformation, remaining to be overcome.

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Section: Introductionmentioning

confidence: 99%

Novel liquid crystal photonic devices enabled by two-photon polymerization [Invited]

He¹,

Tan²,

Chanda³

et al. 2019

Opt. Express

Self Cite

View full text Add to dashboard Cite

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“…The proposal of PVG is conducive to the solution to this pain point problem. On the other hand, PVG also exhibits Pancharatnam-Berry (PB) phase polarization response characteristics not found in volume holographic grating [28]. This feature guarantees the see-through ability of the waveguide system under large FOV (wide response bandwidth) and adds a new design dimension to the waveguide coupling component.…”

Section: Methodsmentioning

confidence: 93%

Exit Pupil Expansion Based on Polarization Volume Grating

Cui

Zhang

2021

Crystals

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In this paper, we demonstrate a waveguide display structure which can realize a large field of view on a two-dimensional plane and a larger exit pupil size at the same time. This waveguide structure has three polarization volume gratings as its coupling elements. We use Zemax to simulate the effect of monochromatic and full-color two-dimensional exit pupil expansion and actually prepared a monochromatic waveguide with a two-dimensional exit pupil expansion structure. For the red, green, and blue light beams, it can achieve a large diffraction angle and can achieve diffraction efficiency of more than 70%. The waveguide structure shown can have an angle of view of 35° in the horizontal direction and 20° in the vertical direction, and an exit pupil of 18 mm long and 17 mm wide was achieved at the same time. As measured, the overall optical efficiency was measured as high as 118.3 cd∕m2 per lumen with a transparency of 72% for ambient light.

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“…These unique advantages make PVG a promising candidate for beam steering applications. While PVGs can be applied as a passive beam steerer, with the help of the fast-switching polarization rotator mentioned in Section 3.5, active PVGs can also be achieved by assembling a cell with dual-frequency LC materials [91]. As manifested in Figure 14, after applying a voltage of 50 V (1 kHz), the LC directors are re-oriented to the homeotropic state, where the Bragg grating effect disappears.…”

Section: Lc Volume Gratingsmentioning

confidence: 99%

Liquid Crystal Beam Steering Devices: Principles, Recent Advances, and Future Developments

et al. 2019

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Continuous, wide field-of-view, high-efficiency, and fast-response beam steering devices are desirable in a plethora of applications. Liquid crystals (LCs)-soft, bi-refringent, and self-assembled materials which respond to various external stimuli-are especially promising for fulfilling these demands. In this paper, we review recent advances in LC beam steering devices. We first describe the general operation principles of LC beam steering techniques. Next, we delve into different kinds of beam steering devices, compare their pros and cons, and propose a new LC-cladding waveguide beam steerer using resistive electrodes and present our simulation results. Finally, two future development challenges are addressed: Fast response time for mid-wave infrared (MWIR) beam steering, and device hybridization for large-angle, high-efficiency, and continuous beam steering. To achieve fast response times for MWIR beam steering using a transmission-type optical phased array, we develop a low-loss polymer-network liquid crystal and characterize its electro-optical properties.

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Multistimuli‐Responsive Self‐Organized Liquid Crystal Bragg Gratings

Cited by 66 publications

References 50 publications

Novel liquid crystal photonic devices enabled by two-photon polymerization [Invited]

Novel liquid crystal photonic devices enabled by two-photon polymerization [Invited]

Exit Pupil Expansion Based on Polarization Volume Grating

Liquid Crystal Beam Steering Devices: Principles, Recent Advances, and Future Developments

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