Liquid crystal lenses with tunable focal length

Lin, Yi‐Hsin; Wang, Yu-Jen; Reshetnyak, Victor

doi:10.1080/21680396.2018.1440256

Cited by 204 publications

(86 citation statements)

References 298 publications

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“…A prominent example of 2.5D alignment was demonstrated as a composite-lens type refractive LC microlens array. These tunable-focus liquid crystal (LC) microlens arrays are an essential optical component for image processing [89,90], beam steering [91,92], wavefront correction [93] and switchable 2D/3D displays [94]. Figure 8(a) illustrates the schematic plot of such a LC microlens array.…”

Section: Curvilinear Surface (25d) Alignmentmentioning

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: Curvilinear Surface (25d) Alignmentmentioning

confidence: 99%

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

He¹,

Tan²,

Chanda³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

show abstract

“…These applications include liquid crystal displays (LCD) [1], tunable lenses [2], retarders [3], filters [3], wave plates [3], diffractive optical elements [4], optical shutters [5] and smart windows [6]. Extreme work has been done by many researchers to improve the dielectric, electro-optical and optical properties of NLCs [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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In the present investigation, TiO 2 -doped weakly polar nematic liquid crystal (NLC) has been studied. This study mainly focuses on dielectric, electro-optical and optical properties of pure NLC and doped systems. Variation in different parameters like dielectric permittivity, dielectric loss, dielectric anisotropy and conductivity has been noticed. Permittivity of the doped system is almost the same as undoped system. With doping concentration, the ionic contribution to the dielectric loss as observed in low-frequency region has been suppressed and the shift in relaxation frequency toward higher frequency side has also been observed. The electrical conductivity and threshold voltage have been decreased with increasing concentration of nanoparticles (NPs). The continuous increase in dielectric anisotropy with increasing the concentration of NPs has also been observed. These results have been attributed to the trapping capability of free ions by TiO 2 NPs. Further, we focused on the study of photoluminescence (PL), UV absorbance and Fourier transformed infrared spectroscopy (FTIR) of pure and doped systems. The continuous increase in PL intensity without any shift in emission peak has been observed for doped systems. Enhancement in UV absorbance with increasing concentration of NPs has also been observed. The effect of NPs doping on molecular dynamics of NLC can be clearly seen by FTIR study. The results suggest that the TiO 2 NP-doped weakly polar NLC can have significant improved dielectric, electro-optical and optical properties. This makes the weakly polar NLC to be a potential candidate for many applications.

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“…However, they have also proven to be versatile materials, with uses in adaptive optical elements such as switchable prisms, gratings and lenses. These systems can be used to further develop new applications in the areas of dynamic contact lenses, camera lenses, augmented or mixed reality systems and holographic display technology [5][6][7].…”

Section: Digital Opticsmentioning

confidence: 99%

77‐1: Invited Paper: Liquid Crystals beyond Displays: Smart Antennas and Digital Optics

Fritzsch

Snow

Sargent

et al. 2019

Symp Digest of Tech Papers

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Liquid crystal lenses with tunable focal length

Cited by 204 publications

References 298 publications

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

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

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

77‐1: Invited Paper: Liquid Crystals beyond Displays: Smart Antennas and Digital Optics

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