Positive-Negative Tunable Liquid Crystal Lens of Rectangular Aperture

Feng, Wenbin; Ye, Mao

doi:10.1109/lpt.2022.3189020

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…Electrical interconnections can be dramatically simplified using spirals rather than concentric circles in the preparation of the Fresnel lens. To create a 12-step, 5-ring Fresnel lens like that shown in Figure 19: As well as some elaborate electrode designs mentioned above [32][33][34], several authors have formulated various proposals to overcome this issue, such as variable transmission electrodes [98], interdigitated comb electrodes [99], microstructured transmission lines [100], or 4-electrode lenses with rectangular aperture [101]. Nevertheless, the electrode design is complex, and the control of the electric field distribution is limited in most cases.…”

Section: Spirals As Alternative Approachmentioning

confidence: 99%

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Optimizing Tunable LC Devices with Twisted Light

Otón,

Pereiro-García,

Quintana

et al. 2023

Crystals

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Tunable circular devices made of liquid crystals or other materials, like lenses, axicons, or phase plates, are often constrained by limitations in size, tunability, power, and other parameters. These constraints restrict their use and limit their applicability. In this review, a thorough study of the use of light’s orbital angular momentum in the manufacturing of liquid crystal (LC) devices is presented. Twisted light fosters the simultaneous optimization of most critical parameters. Experimental demonstrations of the unmatched performance of tunable LC lenses, axicons, and other elements in parameters such as lens diameter (>1″), power and tunability (>±6 diopters), fill factor (>98%), and time response have been achieved by reversible vortex generation created by azimuthal phase delay. This phase delay can eventually be removed within the optical system so that lens performance is not affected.

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Section: Spirals As Alternative Approachmentioning

confidence: 99%

“…Some fancy electrode designs have been proposed as well to contribute to the electric field distribution, e.g., serpentine electrodes [32], spiral electrodes [33], or rectangular aperture lenses [34]. • A rather different approach is given by Pancharatnam-Berry phase devices (PPD, [35]), specifically Pancharatnam-Berry lenses.…”

mentioning

confidence: 99%

Optimizing Tunable LC Devices with Twisted Light

Otón,

Pereiro-García,

Quintana

et al. 2023

Crystals

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show abstract

“…Furthermore, by incorporating electrically controlled LC devices, independent intensity modulation can be achieved. As a versatile broadband vortex beam generator, this system not only facilitates the generation and modulation of a perfect vortex phase but also allows precise control of the output intensity of the vortex part and Gaussian part by adjusting the voltage applied on the electrically controlled LC q-plate [32][33][34]. Our work provides a fully electrically controlled" convenient, efficient, low-cost, high-precision, and easily integrative optical system for vortex beam generating and modulating, and is expected to expand the applications of vortex beams in national defense and military fields such as optical communication, laser processing, high-density optical storage, high-resolution imaging, and quantum technology [35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Broadband Vortex Beam Modulating System Based on Electrically Controlled Liquid Crystal Devices

Zhou,

Zhu,

Xie

et al. 2023

Photonics

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Vortex beams with helical phase wavefronts have recently emerged as a research hotspot because of their widespread applications such as ultra-high dimensional information encoding, quantum entanglement, and data transmission due to their unique properties. Research, as of yet, on the easy preparation of vector vortex beams is hindered by technical bottlenecks such as large mechanical modulation errors and limited bandwidths of meta-structured devices in spite of the massive experimental and theoretical breakthroughs in the generation of vortex beams that have been made. To make up for the deficiency in this area, we propose here a broadband vortex beam modulating system based on electrically controlled liquid crystal (LC) devices. An electrically controlled LC q-plate and an LC broadband polarization grating (PG) are integrated in the system as the crux devices. The system enables pure vortex-phase modulation within a wide spectral range in the visible spectrum and electrical control on the output beam intensity of the vortex and Gaussian components. Experiments at different voltages of 533 nm and 632.8 nm were conducted for validation. This system overcomes the complexity and stringent optical path requirements of traditional methods for generating vortex beams, offering an efficient, convenient, and rapidly tunable approach for generating vortex beams that is easily and highly integrable.

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“…Recently, we proposed [47][48][49][50] forming parabolic voltage distributions using resistive lines and driving the LC lens with voltages within the linear response range of the LC material. An LC lens with a nearly parabolic phase profile is realized and the parabolic phase profile is maintained during focus tuning.…”

Section: Introductionmentioning

confidence: 99%

Design of Tunable Liquid Crystal Lenses with a Parabolic Phase Profile

et al. 2022

Self Cite

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An electrode pattern design generating a parabolic voltage distribution, in combination with usage of the linear response range of the liquid crystal (LC) material, has been recently proposed to obtain nearly ideal phase profiles for LC lenses. This technique features low driving voltages, simple structure, compact design, and the absence of high-resistivity (HR) layers. In this work, the universal design principle is discussed in detail, which is applicable not only to LC lens design, but also to other LC devices with any phase profile. Several electrode patterns are presented to form a parabolic voltage distribution. An equivalent electric circuit of the LC lens based on the design principle is developed, and the simulation results are given. In the experiments, an LC lens using the feasible parameters is prepared, and its high-quality performance is demonstrated.

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Positive-Negative Tunable Liquid Crystal Lens of Rectangular Aperture

Cited by 6 publications

References 26 publications

Optimizing Tunable LC Devices with Twisted Light

Optimizing Tunable LC Devices with Twisted Light

Broadband Vortex Beam Modulating System Based on Electrically Controlled Liquid Crystal Devices

Design of Tunable Liquid Crystal Lenses with a Parabolic Phase Profile

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