Liquid crystal Pancharatnam-Berry phase lens with spatially separated focuses

Zhou, Yaqin; Yin, Yin; Yuan, Yide; Lin, Tiegang; Huang, Huihui; Yao, Lishuang; Wang, Xiaoqian; Tam, Alwin Ming Wai; Fan, Fan; Wen, Shuangchun

doi:10.1080/02678292.2018.1550820

Cited by 23 publications

(11 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After numerical calculations, the height and lattice size of the metalens are fixed at H = 650 nm and P = 265 nm, and the radius R is selected as R = 107.75, 101.5, 94, 86.5, 79.5, 72, 63, and 50 nm for the phase shifts of 0, π/4, π/2, 3π/4, π, 5π/4, 3π/2, and 7π/4, respectively (see the detail numerical results in Figure S1 and Table S1 in the Supporting Information). The nanoposts are distributed on the substrate following 2 θ ( x , y ), which is defined by the equation with a focus length f = 280 µm [ 44,48‐51 ]

θ false(x, y false) = \frac{π}{λ} (f - \sqrt{x^{2} + y^{2} + f^{2}})

where x , y correspond to the location of nanoblock in a Cartesian coordinates and λ = 520 nm is the wavelength of incident laser. Note that the nanocylinders have circular cross‐sections.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Spin Angular Momentum Controlled Multifunctional All‐Dielectric Metasurface Doublet

Fan

Wang

et al. 2020

Laser & Photonics Reviews

View full text Add to dashboard Cite

Lenses are the most important components of portable and integrable optical systems. Due to the inherent limitation of system sizes, external accessories are required for realizing additional functions such as close‐up or telegraph imaging, making the entire system complicated and cumbersome. Herein, based on the developments of metalenses, a spin angular momentum controlled multifunctional camera system is reported. Two types of metalens with high efficiencies are designed and fabricated for circularly polarized and nonpolarized light, respectively. By combining them into a doublet, multiple functions are realized beyond a camera lens. For left‐handed circular polarization light, the doublet works as a compound microscope with a magnification factor of 20 and a resolution of 1.07 µm. The system switches to a Galileo telescope when the incident light turns to be right‐handed circularly polarized. This research shall extend and strengthen the practical applications of metasurfaces in portable imaging systems as well as the integrated sensing terminals.

show abstract

θ false(x, y false) = \frac{π}{λ} (f - \sqrt{x^{2} + y^{2} + f^{2}})

where x , y correspond to the location of nanoblock in a Cartesian coordinates and λ = 520 nm is the wavelength of incident laser. Note that the nanocylinders have circular cross‐sections.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Spin Angular Momentum Controlled Multifunctional All‐Dielectric Metasurface Doublet

Fan

Wang

et al. 2020

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…Photo-aligning materials Figure 16. (a) Schematic optical setup of the characterization with a screen placed at the position of (b) when a pentagram was set as the test pattern and (c) when the test pattern was changed to the letters 'HG' [38].…”

Section: Discussionmentioning

confidence: 99%

“…The modification of the size and the sharpness of the diffracted hollow beam was demonstrated by encoding a positive (negative) PB lens term into the director orientation expression of a PB (anti-)axicon, as shown in Figure 15. A liquid crystal beam splitting lens with spatially separated focuses via liquid crystal photoalignment technology was fabricated [38]. The proposed lens with exotic optical properties was realized by integrating a polarization grating with a Pancharatnam-Berry phase LC lens.…”

Section: Liquid Crystal Optical Elements With Integrated Pancharatnammentioning

confidence: 99%

“…Moreover, by adjusting the distance between the proposed lens and the conventional glass lens, the focal lengths of the lens system could be modulated. A liquid crystal beam splitting lens with spatially separated focuses via liquid crystal photoalignment technology was fabricated [38]. The proposed lens with exotic optical properties was realized by integrating a polarization grating with a Pancharatnam-Berry phase LC lens.…”

Section: Liquid Crystal Optical Elements With Integrated Pancharatnammentioning

confidence: 99%

See 1 more Smart Citation

Photoaligning and Photopatterning: New LC Technology

2020

Self Cite

View full text Add to dashboard Cite

We demonstrate a physical model of photoalignment and photopatterning based on rotational diffusion in solid azo-dye nanolayers. We also highlight the new applications of photoalignment and photopatterning in display and photonics such as: (i) liquid crystal (LC) E-paper devices, including optically rewritable LC E-paper on flexible substrates as 3D E-paper, as well as optically rewritable technology for photonics devices; (ii) photonics LC devices, such as LC Switches, polarization controllers and polarization rotators, variable optical attenuators, LC filled photonic crystal fiber, switchable diffraction grating; (iii) patterned micro-polarizer array using photo-alignment technology for image sensor; (iv) electrically tunable liquid crystal q-plates; (v) electrically switchable liquid crystal Fresnel lens; (vi) liquid crystal optical elements with integrated Pancharatnam-Berry phases. We are sure, that in the field of (LC), the main point is no longer display research, but new photonic applications of LC are emerging in telecommunication, fiber optical communication systems, sensors, switchable lenses, LC light converters and other LC photonics devices.

show abstract

“…The optical power can reach +2.4 diopters for a 13 mm aperture. This type of lens has been proposed to solve the problem of accommodation-convergence in head-mounted display devices [164,165] and to generate spatially separated focuses [166].…”

Section: Aligment Layermentioning

confidence: 99%

Liquid Crystal Optical Device

Bennis¹,

Jaroszewicz²

2020

View full text Add to dashboard Cite

Polarization is a very useful parameter of a light beam in many optical measurements. Improvement of holographic systems requires optical elements which need a diffused and depolarized light beam. This paper describes a simple monochromatic depolarizer based on a pure vertically aligned liquid crystal without pretilt. In this work we present an extended description of depolarizer by analyzing its electro-optic properties measured in spatial and time domains with the use of crossed polarizers and polarimetric configurations. Crossed polarizers setup provides information on spatial and temporal changes of microscopic textures while polarimetric measurement allows to measure voltage and time dependence of degree of polarization. Three different thicknesses, i.e., 5 μm, 10 μm and 15 μm have been manufactured in order to analyze another degree of freedom for this type of depolarizer device based on a liquid crystals' material. Consideration of the light scattering capability of the cell is reported.

show abstract

Liquid crystal Pancharatnam-Berry phase lens with spatially separated focuses

Cited by 23 publications

References 34 publications

Spin Angular Momentum Controlled Multifunctional All‐Dielectric Metasurface Doublet

Spin Angular Momentum Controlled Multifunctional All‐Dielectric Metasurface Doublet

Photoaligning and Photopatterning: New LC Technology

Liquid Crystal Optical Device

Contact Info

Product

Resources

About