Encoding and Multiplexing of 2D Images with Orbital Angular Momentum Beams and the Use for Multiview Color Displays

Chu, Junfei; Chu, Daping; Smithwick, Quinn

doi:10.1155/2019/9564593

Cited by 9 publications

(10 citation statements)

References 36 publications

(45 reference statements)

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“…As depicted in Figure 13(a), dual-modes with different radiation directions were obtained by a single metasurface [110]. For generating k OAM modes with specific directions ûk, the introduced phase variation of mnth unit cell should include three terms and can be described as follow, 22 arg…”

Section: Multiple Modes or Reconfigurationmentioning

confidence: 99%

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Recent progress on RF orbital angular momentum antennas

Guo

Yang

et al. 2020

Journal of Electromagnetic Waves and Applications

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In the last five years or so, there has been a great interest in RF OAM to address the contradiction between the lack of wireless spectrum resources and the continually growing demands of the bandwidth. Recent developments and technological advancements in antenna design, material science, and integrated circuits have enabled miniaturized, multiple modes, tunable in radio frequency (RF) orbital angular momentum (OAM) antenna designs. From conventional methods such as spiral phase plate and reflector antenna to antenna array and metasurface, the working principle and structures are introduced. To improve the performance of RF OAM antennas, several innovative physical concepts, including multiple-input multiple-output, circular polarization rotation, PIN diodes dynamic regulation, and so on have been explored for the designs of RF OAM antenna designs. In this paper, we present an up-to-date survey on the development of RF OAM antenna technologies. We provide details on structure designs and theoretical analyses. The evaluate method and advantage analyses are also included. Open issues and development trends are explored as a source of inspiration towards the future better outcome of RF OAM antenna designs.

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Section: Multiple Modes or Reconfigurationmentioning

confidence: 99%

“…In the optical regime, the OAM has been widely applied in many fields, such as imaging, nano-particle manipulation, and optical communicating, owing to its special electromagnetic properties [17][18][19][20][21][22]. The total angular momentum consists of spin angular momentum (SAM) and OAM.…”

Section: Introductionmentioning

confidence: 99%

Recent progress on RF orbital angular momentum antennas

Guo

Yang

et al. 2020

Journal of Electromagnetic Waves and Applications

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“…[ 1–5 ] In comparison with conventional optical encryption methods, micro‐optics/nano‐optics‐based encryption devices possess many irreplaceable advantages of high storage capacity, miniaturization, multiplicity, and integration capability. [ 6–11 ] Among various micro‐optics/nano‐optics devices, metasurface, consisting of planar subwavelength structures, has emerged as a particularly powerful platform for modulating light parameters such as amplitude, [ 12,13 ] phase, [ 14–16 ] wavelength, [ 17–20 ] polarization, [ 4,21–23 ] and hybrid parameters, [ 24,25 ] which provides the possibility of potential applications of information encryption, data storage, and optical communication. [ 26–28 ]…”

Section: Introductionmentioning

confidence: 99%

Integrated Metasurfaces with Microprints and Helicity‐Multiplexed Holograms for Real‐Time Optical Encryption

Luo

et al. 2020

Advanced Optical Materials

135

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many irreplaceable advantages of high storage capacity, miniaturization, multi plicity, and integration capability. [6][7][8][9][10][11] Among various microoptics/nano optics devices, metasurface, consisting of planar subwavelength structures, has emerged as a particularly powerful plat form for modulating light parameters such as amplitude, [12,13] phase, [14][15][16] wavelength, [17][18][19][20] polarization, [4,[21][22][23] and hybrid parameters, [24,25] which provides the possibility of potential applications of information encryption, data storage, and optical communication. [26][27][28] Microprint and holography are often used as two separate optical encryption strategies applied in independent meta surface devices, which can be achieved by controlling over plasmonic [29][30][31][32][33][34] or all dielectric [35][36][37][38][39][40] structures at the nanoscale. To strengthen optical information secu rity, other parametric freedoms such as polarization, [41][42][43][44][45] wavelength, [17,[46][47][48][49] and spatial freedom [50][51][52] have been explored to achieve multiplexed microprint or holography encryption devices. Very recently, attempts have been imple mented to combine the microprint and holography in a single device. [53][54][55] However, although the combination of holography and microprints brings about the increase of encrypted dimen sions, crosstalk between different channels remains a thorny problem, and devices will not transmit repeatedly between senders and receivers once fabricated. Fabry-Pérot (FP) cavity resonators with narrow spectral linewidth can effectively sup press crosstalk and can be integrated to act as color filters, [56,57] which provides a potential solution. However, significant chal lenges such as realtime encryption, transmission security, and data compactness still need to be overcome.Here, we propose a novel type of metasurfacebased device that combines color FP cavitybased microprint and helicity multiplexed metahologram. Such devices have the encryption dimensions of microprint, holography as well as helicity at the same time by independently manipulating the amplitude, phase, and polarization of the incident light. A specific algo rithmic framework is developed to combine holography with structural color, and the particle swarm optimization (PSO) algorithm is built to optimize the conversion efficiencies of metasurface elements. Furthermore, enabled by a microprint of editable quick response (QR) code, a realtime encryption Optical encryption with multichannel, high complexity, and artistry characteristics has become one of the most significant approaches for modern information security. Recently emerged metasurface-based optics consisting of planar subwavelength metamaterials has been engineered as an ideal platform for optical encryption because of its capability of manipulating various optical parameters and enhancing information storage capacity. However, limited encrypted channels and insufficient real-time encryption abilities hinder its practical applicatio...

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“…Because of these features, OAM beams have been widely used in optical manipulation, optical tweezers, microscopy and imaging, metrology, optical vortex knots, astronomy, and quantum information processing [2][3][4][5][6][7][8][9][10][11][12][13][14]. In the past few decades, optical communications employing OAM beams have also attracted increasing attention from researchers [15][16][17][18][19][20][21]. Similar to other mode bases in free space or in fiber [22][23][24], OAM beams with helical phase structure are another mode base related to the spatial domain.…”

Section: Introductionmentioning

confidence: 99%

Amplifying Orbital Angular Momentum Modes in Ring-Core Erbium-Doped Fiber

Chen

Wang

et al. 2020

Research

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Lots of research efforts have been devoted to increase the transmission capacity in optical communications using orbital angular momentum (OAM) multiplexing. To enable long-haul OAM mode transmission, an in-line OAM fiber amplifier is desired. A ring-core fiber (RCF) is considered to be a preferable design for stable OAM mode propagation in the fiber. Here, we demonstrate an OAM fiber amplifier based on a fabricated ring-core erbium-doped fiber (RC-EDF). We characterize the performance of the RC-EDF-assisted OAM fiber amplifier and demonstrate its use in OAM multiplexing communications with OAM modes carrying quadrature phase-shift keying (QPSK) and quadrature amplitude modulation (QAM) signals. The amplification of two OAM modes over four wavelengths is demonstrated in a data-carrying OAM-division multiplexing and wavelength-division multiplexing system. The obtained results show favorable performance of the RC-EDF-assisted OAM fiber amplifier. These demonstrations may open up new perspectives for long-haul transmission in capacity scaling fiber-optic communications employing OAM modes.

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Encoding and Multiplexing of 2D Images with Orbital Angular Momentum Beams and the Use for Multiview Color Displays

Cited by 9 publications

References 36 publications

Recent progress on RF orbital angular momentum antennas

Recent progress on RF orbital angular momentum antennas

Integrated Metasurfaces with Microprints and Helicity‐Multiplexed Holograms for Real‐Time Optical Encryption

Amplifying Orbital Angular Momentum Modes in Ring-Core Erbium-Doped Fiber

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