Generalized binary spiral zone plates with a single focus obtained by feedforward neural network

Zang, Huaping; Wang, Yiming; Zheng, Chenglong; Zhou, Weimin; Wei, Lai; Cao, Leifeng; Fan, Quanping

doi:10.1364/oe.500134

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…We know that dividing the aperture into annular sub-apertures is not the only possible solution, and several diffractive lenses can be written by spatial multiplexing in a random scheme without loss of resolution due to smaller apertures [48,49]. In addition, by introducing the neural network algorithms, the axial distributions of the ZPs can be improved and the undesired higher diffraction foci can be successfully suppressed [50]. In future endeavors, we will dedicate work to further optimizing the focusing performance of our proposal by exploiting particular algorithms.…”

Section: Discussionmentioning

confidence: 99%

The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate

Zang,

Li,

Zheng

et al. 2024

Photonics

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We propose a new vortex lens for producing multiple focused coaxial vortices with approximately equal intensities along the optical axis, termed equal-intensity multi-focus composite spiral zone plates (EMCSZPs). In this typical methodology, two concentric conventional spiral zone plates (SZPs) of different focal lengths were composited together and the alternate transparent and opaque zones were arranged with specific m-bonacci sequence. Based on the Fresnel–Kirchhoff diffraction theory, the focusing properties of the EMCSZPs were calculated in detail and the corresponding demonstration experiment was been carried out to verify our proposal. The investigations indicate that the EMCSZPs indeed exhibit superior performance, which accords well with our physical design. In addition, the topological charges (TCs) of the multi-focus vortices can be flexibly selected and controlled by optimizing the parameters of the zone plates. These findings which were demonstrated by the performed experiment may open new avenues towards improving the performance of biomedical imaging, quantum computation and optical manipulation.

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Section: Discussionmentioning

confidence: 99%

The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate

Zang,

Li,

Zheng

et al. 2024

Photonics

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Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

Radivon,

Katyba,

Raginov

et al. 2024

Advanced Optical Materials

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Optical elements based on nanomaterials are becoming major avenues to satisfy the technological requirements of compact, lightweight, and tunable elements of the emerging terahertz (THz) field. A new generation of diffractive components integrating specific geometry with additional features (flexibility, stretchability, rotation, and other approaches for tuning properties) extends the functionality of wavefront control. Here, an innovative approach is demonstrated to control the THz wavefront via a layered composition of spiral zone plates (SZPs) with tunable mutual orientation and scaling. As a proof of concept, the SZP is designed using Laguerre‐Gauss mode analysis with further fabrication and experimental characterization of the resultant vortex beams. For each single SZP, a flexible element is proposed based on a thin film of single‐walled carbon nanotubes deposited on a stretchable substrate. Thus, this diffraction element can be tuned not only by rotation (along the azimuthal direction), but also by its stretching (in the radial direction). The spatial tuning of the developed SZPs (spiral zone plates) opens up an efficient, convenient, and highly customizable approach for the manipulation of vortex beams.

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Hexagonal diffraction gratings generated by convolutional neural network-based deep learning for suppressing high-order diffractions

Hu,

Ding,

et al. 2024

J. Opt. Soc. Am. A

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The st order diffraction of gratings is widely used in spectral analysis. However, when the incident light is non-monochromatic, the higher-order diffractions generated by traditional diffraction gratings are always superimposed on the useful first-order diffraction, complicating subsequent spectral decoding. In this paper, single-order diffraction gratings with a sinusoidal transmittance, called hexagonal diffraction gratings (HDGs), are designed using a convolutional neural network based on deep learning algorithm. The trained convolutional neural network can accurately retrieve the structural parameters of the HDGs. Simulation and experimental results confirm that the HDGs can effectively suppress higher-order diffractions above the third order. The intensity of third-order diffraction is reduced from 20% of the first-order diffraction to less than that of the background. This higher-order diffraction suppression property of the HDGs is promising for applications in fields such as synchrotron radiation, astrophysics, and soft x-ray lasers.

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Generalized binary spiral zone plates with a single focus obtained by feedforward neural network

Cited by 3 publications

References 38 publications

The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate

The Generation of Equal-Intensity and Multi-Focus Optical Vortices by a Composite Spiral Zone Plate

Expanding THz Vortex Generation Functionality with Advanced Spiral Zone Plates Based on Single‐Walled Carbon Nanotube Films

Hexagonal diffraction gratings generated by convolutional neural network-based deep learning for suppressing high-order diffractions

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