Ultrabroadband gradient-pitch Bragg-Berry mirrors

Rafayelyan, Mushegh; Agez, Gonzague; Brasselet, Étienne

doi:10.1103/physreva.96.043862

Cited by 35 publications

(21 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This solves previous optical state dispersion drawbacks associated with the global processing of the whole spectrum using "Bragg-Berry" optical elements [19]. Note that broadband optical vortex generation based on geometric phase has been reported using various approaches [20][21][22][23][24][25][26][27][28]; however, none of them enables spectral agility of the associated photon orbital angular momentum. Here, wavelength-dependent orbital angular momentum control is also achieved, as illustrated in Fig.…”

Section: Multispectral Management Of the Photon Orbital Angular Momentummentioning

confidence: 96%

Multispectral Management of the Photon Orbital Angular Momentum

Nassiri

Brasselet

2018

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Section: Multispectral Management Of the Photon Orbital Angular Momentummentioning

confidence: 96%

Multispectral Management of the Photon Orbital Angular Momentum

Nassiri

Brasselet

2018

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

“…[ 3 ] Based on these attractive optical properties, many novel CLC devices have been developed and widely utilized in band pass filter, [ 4 ] laser beam steering, [ 5 ] optical combiners for augmented reality displays, [ 6 ] optical vortex generators, [ 7 ] beam shaper, [ 8 ] and many broadband devices. [ 9–11 ]…”

Section: Figurementioning

confidence: 99%

Reflective Polarization Volume Lens with Small f‐Number and Large Diffraction Angle

Yin

2020

Advanced Optical Materials

View full text Add to dashboard Cite

Planar optics based on patterned cholesteric liquid crystals (CLCs) has attracted increasing attention owing to the self‐organized helical structure and the ability to create arbitrary reflected wavefront through spatial orientation control. However, because of the subwavelength‐orientation requirement, it is challenging for liquid crystal lens to achieve a low f‐number (f/#) and large deflection angle simultaneously. Furthermore, with the increasing demand for compact size in novel optical systems, reflective lens has advantage over the transmissive one because it can fold the optical path. Here, a new off‐axis reflective polarization volume lens (PVL) with f/# = 0.825, large aperture size, simple fabrication process, thin profile, circular polarization selectivity, and large diffraction angle is proposed. In contrast to traditional vertical spiral structure, PVL is based on patterned CLCs with a slanted helical axis. In this paper, the PVL is theoretically evaluated and then three reflective PVLs at red, green, and blue wavelengths (R = 605 nm, G = 532 nm, and B = 450 nm) are fabricated. Meanwhile, a simple approach is utilized to achieve 20 mm diameter and 16.5 mm focal length. The low scattering and good image quality of reflective PVL enrich these functional devices and provide promising applications to novel foldable optical systems and waveguide‐based wearable near‐eye displays.

show abstract

Section: Photonic Applicationsmentioning

confidence: 99%

“…To further extend the spectral range, gradient‐pitch CLCs were employed, which could be realized by thermal diffusion, slow polymerization, and stacking multiple CLC films with various pitches . Ultra‐broadband OV was obtained in the full visible domain over 400–700 nm range (Figure C) . More recently, polychromatic vectorial vortex beams have been presented with the assistant of a rear mirror .…”

Section: Photonic Applicationsmentioning

confidence: 99%

Light‐Activated Liquid Crystalline Hierarchical Architecture Toward Photonics

Zheng

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

remarkable structure results in a helical-variant dielectric tensor, thus contributing to a natural 1D photonic crystal. [7] It is endowed with a broadband Bragg reflection with a unique circular-polarization selectivity. Blue phase (BP) is another fantastic phase with 3D stacked lattice ( Figure 1D). [8] Such an elegant state-of-matter is energetically preferred in a high chirality system, commonly existing in a narrow temperature range of less than 1 K, between the cholesteric and isotropic phases. It has an exotic arrangement characteristic of LCs, which twists around two helical axes forming cylinders including hierarchically twisted molecular architectures. Such double twisted cylinders are impossible to tile the whole 3D space, which leads to inevitable disclinations and results in frustrated structures.Self-organization is an intrinsic ability of LC molecules. However, the precise control and generation of large-area desirable hierarchical superstructures require state-of-the-art techniques that usually combine the "top-down" microfabrication with the "bottom-up" self-assembly. Here, we review various hierarchical architectures in SLCs, CLCs, and BPLCs, especially recent progresses in light-activated LC hierarchical superstructures, as well as their optics and photonics applications in optics and photonics. In this review, we will see the controllable spatial smectic layer curving via 2D anchoring confinement, 3D topographic confinement, and external field guidance, with which the domain size, shape, orientation, and lattice symmetry of focal conic domain (FCD) arrays are well manipulated. The control of helix direction or fluctuation of CLC layers and the growth of unique fingerprint textures including spiral and wave-like continuous gratings are presented. The 3D manipulation of BPLC hierarchical architecture is accomplished photoalignment and various light-driven azobenzene molecular motors. The construction of these unique hierarchical superstructures brings new opportunities to the design of novel optic and photonic devices. Corresponding applications, including traditional microlens array, beam steering, and more advanced specific optical field generation and LC lasers are comprehensively reviewed as well.

show abstract

Ultrabroadband gradient-pitch Bragg-Berry mirrors

Cited by 35 publications

References 39 publications

Multispectral Management of the Photon Orbital Angular Momentum

Multispectral Management of the Photon Orbital Angular Momentum

Reflective Polarization Volume Lens with Small f‐Number and Large Diffraction Angle

Light‐Activated Liquid Crystalline Hierarchical Architecture Toward Photonics

Contact Info

Product

Resources

About