3D Engineering of Orbital Angular Momentum Beams via Liquid‐Crystal Geometric Phase

Liu, Si‐Jia; Chen, Peng; Ge, Shi‐Jun; Zhu, Lin; Zhang, Yi‐Heng; Lu, Yanqing

doi:10.1002/lpor.202200118

Cited by 16 publications

(4 citation statements)

References 45 publications

(48 reference statements)

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“…[46] Moreover, owing to the capability of full-field spatial mode control, [39] the device also paves the way to quantum control of high-dimension photonic skyrmions. [58,59] Beyond single-beam vector mode control, this principle can further realize multiple vector mode control through the addition of a Dammann grating structure; [12,60,61] see Supporting Information for an extended discussion. This represents a promising way to develop information exchange and processing units working for photonic SOC states, that is, vector-mode multiplexers and demultiplexers.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Toward Arbitrary Spin‐Orbit Flat Optics Via Structured Geometric Phase Gratings

Liu

et al. 2023

Laser & Photonics Reviews

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Reciprocal spin-orbit coupling (SOC) via geometric phase with flat optics provides a promising platform for shaping and controlling paraxial structured light. Current devices, from the pioneering q-plates to the recent J-plates, provide only spindependent wavefront modulation without amplitude control. However, achieving control over all the spatial dimensions of paraxial SOC states requires spin-dependent control of corresponding complex amplitude, which remains challenging for flat optics. Here, to address this issue, we present a new type of flat-optics elements termed structured geometric phase gratings that is capable of conjugated complex-amplitude control for orthogonal input circular polarizations. By using a microstructured liquid crystal photoalignment technique, we engineered a series of flat-optics elements and experimentally showed their excellent precision in arbitrary SOC control. This principle unlocks the full-field control of paraxial structured light via flat optics, providing a promising way to develop an information exchange and processing units for general photonic SOC states, as well as extra-/intracavity mode convertors for high-precision laser beam shaping.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Toward Arbitrary Spin‐Orbit Flat Optics Via Structured Geometric Phase Gratings

Liu

et al. 2023

Laser & Photonics Reviews

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“…First, the Gaussian beam emitted from the collimator is transformed into an OAM beam using a spatial light modulator (SLM) loaded with a helical phase distribution to generate a single OAM channel. And then, the input single Anti-interference [141][142][143][144][145][146][147][148][149] Adding/ Extracting…”

Section: Oam Channel Multicastingmentioning

confidence: 99%

“…Specifically, the ABERs of the proposed IM-MH and IM-DSMH schemes are approximately 25% and 10% of the traditional schemes, respectively. At present, most OAM-RD which can realize the channel switching function realizes the strong anti-interference ability of wireless communication by mode hopping or frequency hopping [148,149]. However, only one OAM mode/band is excited to load and transmit line information per hop, resulting in low-capacity problems caused by low OAM mode or spectral interest rate.…”

Section: Oam Channel Hoppingmentioning

confidence: 99%

Research Progress on Router Devices for the OAM Optical Communication

Wang,

Zhang,

Tian

et al. 2024

Sensors

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Vortex beams carrying orbital angular momentum (OAM) provide a new degree of freedom for light waves in addition to the traditional degrees of freedom, such as intensity, phase, frequency, time, and polarization. Due to the theoretically unlimited orthogonal states, the physical dimension of OAM is capable of addressing the problem of low information capacity. With the advancement of the OAM optical communication technology, OAM router devices (OAM-RDs) have played a key role in significantly improving the flexibility and practicability of communication systems. In this review, major breakthroughs in the OAM-RDs are summarized, and the latest technological standing is examined. Additionally, a detailed account of the recent works published on techniques related to the OAM-RDs has been categorized into five areas: channel multicasting, channel switching, channel filtering, channel hopping, and channel adding/extracting. Meanwhile, the principles, research methods, advantages, and disadvantages are discussed and summarized in depth while analyzing the future development trends and prospects of the OAM-RDs.

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“…The development of photopatterning techniques for liquid crystals enables large-area fabrication of LC based elements, which facilitates the implement of complex LCs microstructures and improvement of their performances 16 . LC-based optical elements have shown various beam shaping and beam steering functions such as working as a polarization grating or a lens in augmented reality (AR) 17,18 and advanced generators of structuring light [19][20][21] . However, a common drawback of these LC based devices is their limited functionality at the design wavelength due to the high chromaticity.…”

Section: Introductionmentioning

confidence: 99%

Design of liquid crystal metalens for achromatic full-color imaging with multiplexed phase coding

Cao¹,

Sun²,

Wang³

2023

International Conference on Optoelectronic Information and Functional Materials (OIFM 2023)

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Liquid crystals metalens (LC-ML) has attracted much attention due to its powerful functions in shaping light field with planar structure and its great application potentials. However, LC-MLs usually suffer from large chromatic aberration resulting from high phase dispersion. Here, we propose and demonstrate achromatic imaging at red-green-blue (RGB) wavelengths 450 nm, 526 nm, and 630 nm with optimized wavelength multiplexed phase coding in a single liquid crystals metalens. The optimized wavelength multiplexed phase coding, which works on three operating wavelengths simultaneously, is introduced via the complex field of summation of the individual optical fields at selected RGB wavelength and can be achieved via photo-patterning an azo-dye doped LC. The optical efficiency of the fabricated achromatic liquid crystals metalens can be optimized by applying appropriate voltages. The proposed achromatic LC-ML at multi-wavelengths is easy to fabricate and has a potential application in the display field.

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3D Engineering of Orbital Angular Momentum Beams via Liquid‐Crystal Geometric Phase

Cited by 16 publications

References 45 publications

Toward Arbitrary Spin‐Orbit Flat Optics Via Structured Geometric Phase Gratings

Toward Arbitrary Spin‐Orbit Flat Optics Via Structured Geometric Phase Gratings

Research Progress on Router Devices for the OAM Optical Communication

Design of liquid crystal metalens for achromatic full-color imaging with multiplexed phase coding

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