Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings

Lei, Ting; Zhang, Meng; Li, Yuru; Jia, Pengbo; Liu, Gordon Ning; Xu, Xiaogeng; Li, Zhaohui; Min, Changjun; Lin, Jiao; Chen, Yu; Niu, Hanben; Yuan, Xiaocong

doi:10.1038/lsa.2015.30

Cited by 463 publications

(218 citation statements)

References 36 publications

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“…The idea of these kinds of grating was first proposed by Dammann and Gortler in 1971 to obtain multiple images from one input object for optical lithography [21]. Later on, the DGs have been proposed for using in lots of interesting application, such as laser beam summation [22], optical interconnections [23], three-dimensional (3D) optical imaging [24], 3D lattice structures generation [25], and optical communication [26]. Moreover, by modifying the grating structure, the optical function of the DG is also extended to be more versatile such as the generation of array of diffractive orders with different vortex phase distribution [26,27].…”

Section: Introductionmentioning

confidence: 99%

“…Later on, the DGs have been proposed for using in lots of interesting application, such as laser beam summation [22], optical interconnections [23], three-dimensional (3D) optical imaging [24], 3D lattice structures generation [25], and optical communication [26]. Moreover, by modifying the grating structure, the optical function of the DG is also extended to be more versatile such as the generation of array of diffractive orders with different vortex phase distribution [26,27]. To fabricate the DG, the conventional used method is the Very-large-scale integration (VSLI) technology, which forms by the steps like preparing mask using electron beam or laser and etching substrate with plasma, reactive ion or wet chemical [28].…”

Section: Introductionmentioning

confidence: 99%

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Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

et al. 2017

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Abstract:In this article, a ferroelectric liquid crystal (FLC) dammann grating (DG) is demonstrated based on the patterned photoalignment technology. By applying low electric field (10 V) on the FLC DG, the grating can switch between a diffractive state with 7 × 7 optical spots array and a non-diffractive state, depending on the polarity of electric field. The FLC DG shows very fast switching speed with switching on time and off time to be only 81 µs and 59 µs respectively. Comparing with other fast LC DGs such as the ones based on blue phase LC or dual-frequency LC, the switching speed of the proposed FLC DG is about one order faster, which provides great potential and perspective for the FLC DG to be applied in a broad range of optical applications such as optical communication and beam shaping.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

et al. 2017

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“…11 For SLM pulses with sub-nanosecond duration, the efficiency of LA is lower, while OPA needs specific pump source and larger aperture, making whole system complicated. In contrast, amplifying light pulses via SRS and SBS in gases, liquids and plasmas have many benefits.…”

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confidence: 99%

Generation of strong cylindrical vector pulses via stimulated Brillouin amplification

Zhu

Chen

Sheng

et al. 2017

Applied Physics Letters

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Light with transverse polarization structure, such as radial and azimuthal polarization, enables and revives lots of applications based on light-matter interaction due to their unique focal properties. To date, studies referring to this topic mainly concentrate in weak-light domain, yet it should have gained more attention in strong-light domain. A main factor contributing to the current situation is that the generation devices cannot afford high power. Here, in this proof-of-principle work, we demonstrate the generation of strong single-longitudinal-mode (SLM) cylindrical vector (CV) short pulses via stimulated Brillouin amplification, specifically, the energy is transferred from a 700 ps pump to a 300 ps Stokes pulse via parametrically generated coherent phonons. After amplification, a 100 mJ-level SLM CV pulse light with 300 ps duration is obtained. Meanwhile, the phase and polarization structures are high fidelity maintained. This result provides a practicable way to generate strong CV light, and by extending this mechanism into multi-pump beam combing system, even an ultra-high intensity CV light can be expected.Science of structured light-the generation and application of light fields with custom transverse intensity, phase and polarization profiles-has gained enormous progress and gradually become the hottest topic of optical community over the past decade. 1,2 In this new subject of modem optics, orbital angular momentum (OAM) 3 plays a crucial role, which is associated with light's twisted phase profile. Particularly, the infinite dimensional space spanned by this degree-of-freedom (DOF) has directly given rise to a promising research direction of the topic-informatics, including both classical and quantum domains. 4 In addition to intensity and phase structures, the polarization of light can also exhibit a non-uniform transverse distribution once the OAM and spin angular momentum (SAM) DOFs are entangled. 5,6 Among them, radially and azimuthally polarized light, two specific members of the so-called cylindrical vector (CV) beam, have received more attention, because their focal a) Zhi-Han Zhu and Peng Chen contributed equally to this work. b) Electronic

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“…OAM adds another degree of freedom in the manipulation of light. The OAM-induced torque and abundant eigenstates lead to numerous applications, such as optical tweezers [4], optical communications [5,6], quantum entanglement [7], and informatics [8,9]. Beyond the optical band, the concept of the vortex beam has also been extended to much broader spectra; the terahertz (THz) range.…”

Section: Introductionmentioning

confidence: 99%

Generating, Separating and Polarizing Terahertz Vortex Beams via Liquid Crystals with Gradient-Rotation Directors

Shen

Chen

et al. 2017

Crystals

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Liquid crystal (LC) is a promising candidate for terahertz (THz) devices. Recently, LC has been introduced to generate THz vortex beams. However, the efficiency is intensely dependent on the incident wavelength, and the transformed THz vortex beam is usually mixed with the residual component. Thus, a separating process is indispensable. Here, we introduce a gradient blazed phase, and propose a THz LC forked polarization grating that can simultaneously generate and separate pure THz vortices with opposite circular polarization. The specific LC gradient-rotation directors are implemented by a photoalignment technique. The generated THz vortex beams are characterized with a THz imaging system, verifying features of polarization controllability. This work may pave a practical road towards generating, separating and polarizing THz vortex beams, and may prompt applications in THz communications, sensing and imaging.

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Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings

Cited by 463 publications

References 36 publications

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment

Generation of strong cylindrical vector pulses via stimulated Brillouin amplification

Generating, Separating and Polarizing Terahertz Vortex Beams via Liquid Crystals with Gradient-Rotation Directors

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