Generalized perfect optical vortices along arbitrary trajectories

Chen, Yue; Wang, Tingchang; Ren, Yu-Xuan; Fang, Zhao-Xiang; Ding, Guangrui; He, Liqun; Lu, Rengui; Huang, Kun

doi:10.1088/1361-6463/abe66b

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…A detailed comparison among them is provided in Table 1 in Supplementary Materials, suggesting that our meta-imager has superior performances, such as arbitrary convolutional operation, high integration, tunable magnification, and high accuracy. For light with other states of polarization, the complex amplitude in our meta-imager might be realized by using a pure-amplitude or pure-phase spatial light modulator with carefully designed encoding technique 50,51 . However, it will lead to increased volume, decreased efficiency, low spatial resolution, and low detection quality.…”

Section: Discussionmentioning

confidence: 99%

Ultracompact meta-imagers for arbitrary all-optical convolution

Zhao

et al. 2022

Light Sci Appl

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Electronic digital convolutions could extract key features of objects for data processing and information identification in artificial intelligence, but they are time-cost and energy consumption due to the low response of electrons. Although massless photons enable high-speed and low-loss analog convolutions, two existing all-optical approaches including Fourier filtering and Green’s function have either limited functionality or bulky volume, thus restricting their applications in smart systems. Here, we report all-optical convolutional computing with a metasurface-singlet or -doublet imager, considered as the third approach, where its point spread function is modified arbitrarily via a complex-amplitude meta-modulator that enables functionality-unlimited kernels. Beyond one- and two-dimensional spatial differentiation, we demonstrate real-time, parallel, and analog convolutional processing of optical and biological specimens with challenging pepper-salt denoising and edge enhancement, which significantly enrich the toolkit of all-optical computing. Such meta-imager approach bridges multi-functionality and high-integration in all-optical convolutions, meanwhile possessing good architecture compatibility with digital convolutional neural networks.

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Section: Discussionmentioning

confidence: 99%

Ultracompact meta-imagers for arbitrary all-optical convolution

Zhao

et al. 2022

Light Sci Appl

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“…Here, the BG vortex beam is usually created by a computer-controlled liquid-crystal spatial light modulator (SLM) [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] or digital micromirror device (DMD) [35], a special designed hybrid phase plate [36], a transparent variable diffractive spiral axicon based on a single liquid-crystal cell [37], polymer-based phase plate [38], metasurface [39], Pancharatnam-Berry phase element [40], axicon [41][42][43], or diffraction of the BG vortex beam by using curved fork grating [44], and so on. In addition, the PVB can be directly generated by schemes including a computer-generated hologram (CGH) displayed on the reflective phase SLM [45][46][47][48] or the DMD [49,50], a radial phase shift spiral zone plate [51,52], a planar Pancharatnam-Berry (PB) phase element [53], or metasurfaces [54][55][56][57][58][59][60][61][62], etc. Recently, the ...…”

Section: Introductionmentioning

confidence: 99%

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Tao,

Liang,

Zhang

et al. 2023

Photonics

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We have experimentally created perfect vortex beams (PVBs) by Fourier transformation of Bessel–Gaussian vortex beams, which are generated by modulating the fundamental Gaussian beam with the spiral phase plates and the axicons, respectively. Although the method has been used many times by other authors, as far as we know, few people pay attention to the quantitative relationship between the control parameters of the PVB and ring width. The effects of the waist radius of the fundamental Gaussian beam wg, base angle of the axicon γ, and focal length of the lens f on the spot parameters (ring radius ρ, and ring half-width Δ) of PVB are systematically studied. The beam pattern of the generated Bessel–Gaussian beam for different propagation distances behind the axicon and the fundamental Gaussian beam wg is presented. We showed experimentally that the ring radius ρ increases linearly with the increase of the base angle γ and focal length f, while the ring half-width Δ decreases with the increase of the fundamental beam waist radius wg, and increases with enlarging the focal length f. We confirmed the topological charge (TC) of the PVB by the interferogram between the PVB and the reference fundamental Gaussian beam. We also studied experimentally that the size of the generated PVB in the Fourier plane is independent of the TCs. Our approach to generate the PVB has the advantages of high-power tolerance and high efficiency.

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“…However, to implement full control of the beam structure, iterative or non-iterative algorithms for calculating the transmission functions of optical elements, such as diffractive optical elements (DOEs) or metasurfaces [22], should be used. In the case of the generation of two-dimensional fields, methods based on the use of two-phase DOEs calculated using the Fourier transform [9] or a rigorous mathematical derivation in the curvilinear coordinate were used [23]. Various amplitude encoding techniques combined with discrete inverse Fourier transform are also widely used to provide full intensity and phase control.…”

Section: Introductionmentioning

confidence: 99%

Simple Method of Light Field Calculation for Shaping of 3D Light Curves

Khonina,

Porfirev,

Volotovskiy

et al. 2023

Photonics

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We propose a method for generating three-dimensional light fields with given intensity and phase distributions using purely phase transmission functions. The method is based on a generalization of the well-known approach to the design of diffractive optical elements that focus an incident laser beam into an array of light spots in space. To calculate purely phase transmission functions, we use amplitude encoding, which made it possible to implement the designed elements using a single spatial light modulator. The generation of light beams in the form of rings, spirals, Lissajous figures, and multi-petal “rose” distributions uniformly elongated along the optical axis in the required segment is demonstrated. It is also possible to control the three-dimensional structure of the intensity and phase of the shaped light fields along the propagation axis. The experimentally generated intensity distributions are in good agreement with the numerically obtained results and show high potential for the application of the proposed method in laser manipulation with nano- and microparticles, as well as in laser material processing.

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Generalized perfect optical vortices along arbitrary trajectories

Cited by 13 publications

References 40 publications

Ultracompact meta-imagers for arbitrary all-optical convolution

Ultracompact meta-imagers for arbitrary all-optical convolution

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width

Simple Method of Light Field Calculation for Shaping of 3D Light Curves

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