Vortex beam: generation and detection of orbital angular momentum [Invited]

Bai, Yihua; Lv, Haijun; Fu, Xin; Yang, Yuanjie

doi:10.3788/col202220.012601

Cited by 97 publications

(25 citation statements)

References 122 publications

(174 reference statements)

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“…18,19 Mostly, for the detection of a given OAM value, researchers have presented many methods to detect OAM states. 20 One common way to identify the topological charge l is to directly observe the interference or farfield diffraction intensity patterns. [21][22][23] But, these methods applied only to the detection of the azimuthal index lðp ¼ 0Þ.…”

Section: Introductionmentioning

confidence: 99%

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

et al. 2022

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Orbital angular momentum (OAM) of an optical vortex has attracted great interest from the scientific community due to its significant values in high-capacity optical communications such as mode or wavelength division multiplexer/demultiplexer. Although several configurations have been developed to demultiplex an optical vortex, the multiwavelength high-order optical vortex (HOOV) demultiplexer remains elusive due to lack of effective control technologies. In this study, we present the design, fabrication, and test of metasurface optical elements for multiwavelength HOOV demultiplexing based on optical gyrator transformation transformations in the visible light range. Its realization in a metasurface form enables the combined measurement of OAM, the radial index p, and wavelength using a single optical component. Each wavelength channel HOOV can be independently converted to a high-order Hermitian-Gaussian beam mode, and each of the OAM beams is demultiplexed at the converter output. Furthermore, we extend the scheme to realize encoding of the three-digit gray code by controlling the wavelength or polarization state. Experimental results obtained at three wavelengths in the visible band exhibit good agreement with the numerical modeling. With the merits of ultracompact device size, simple optical configuration, and HOOV recognition ability, our approach may provide great potential applications in photonic integrated devices and systems for high-capacity and demultiplex-channel OAM communication.

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Section: Introductionmentioning

confidence: 99%

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

et al. 2022

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“…Atmospheric turbulence is a random movement of air, in which irregular changes in temperature, humidity, and pressure lead to uneven refractive index distribution of the atmosphere in general, and many constantly moving air vortices in the flowing atmosphere pose challenges to laser transmission in the atmosphere [1][2][3][4][5][6]. The vortex beam carrying orbital angular momentum has infinite quantum eigenstates of orbital angular momentum by each photon in the beam due to its infinite possibility of topological charge value, which can greatly improve the channel capacity and information transfer efficiency of the current free-space optical communication system [7][8][9][10][11][12]. In addition, vortex beams have been widely used in optical communication, remote sensing, and super-resolution imaging due to their specific spiral phase structure and dark empty ring light intensity distribution [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Bit Error Rate Analysis in Atmospheric Turbulence Channel of Synthetic Double Vortex Beam

Deng

Chen

et al. 2022

IEEE Photonics J.

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Random phase screen method was used to simulate the light intensity and phase distribution of the synthesized double vortex beams transmitted in atmospheric turbulence given the light intensity characteristics and phase characteristics of double Laguerre-Gaussian beams (DLGB) generated by coaxial superposition. Results show that the scintillation coefficient decreases initially, and then increases with the topological charge difference of the double vortex beam, and the topological charge difference is related to the number of split spots. When the number of split spots is small, the intensity distribution is concentrated, exhibiting a good penetrating effect on atmospheric turbulence.

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“…The beam with orbital angular momentum (OAM) has the phase term e i φ in the complex amplitude equation, where φ is the azimuthal angle and is the angular quantum number or topological charge. OAM is an inherent characteristic of vortex beam photons, and each photon carries OAM, which is [3,4]. Due to the highdimensional characteristics of the photon OAM, it is utilized in applications such as optical tweezers [5,6], micromanipulation [7,8], angular velocity sensing [9], quantum information [10][11][12][13], quantum computing [14][15][16][17], optical communications [18][19][20][21][22] and quantum cryptography [23].…”

Section: Introductionmentioning

confidence: 99%

Identification of diffracted vortex beams at different propagation distances using deep learning

Lv,

Guo,

Yang

et al. 2022

Preprint

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Vortex beam: generation and detection of orbital angular momentum [Invited]

Cited by 97 publications

References 122 publications

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface

Bit Error Rate Analysis in Atmospheric Turbulence Channel of Synthetic Double Vortex Beam

Identification of diffracted vortex beams at different propagation distances using deep learning

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