Lei Xin's research while affiliated with Shandong University and other places

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Publications (1)

Simulation results of Si nanopillars. (a) Schematic of a metalens unit cell, consisting of a high-aspect-ratio Si nanopillar with height H, a diameter D, arranged on a Si substrate to form a hexagonal lattice with a subwavelength lattice spacing P. (b) Calculated transmission and phase as a function of the height and the post diameter at λ=3.77 µm. (c) The profile of the white dashed lines in panels (b), showing the full 2π phase coverage and the high transmission.
Schematic diagram of the transmitted light field simulation. (a) Focal plane light field simulation. (b) Axial light field simulation.
The flow chart of the methods. (a) Direct integration. (b) Matrix integration.
Simulation of the transmitted light field. (a) Focal plane light field. (b) Axial light field. For better observation, the focal position coordinates have been set to z = 0.
Schematic of the metalens doublet with field-of-view-optimized. (a) Schematic illustration of the metalens doublet. (b) The modulation transfer function (MTF) for the designed metalens doublet. (c) Focal plane normalized light field simulation for 0°, 7.8°, and 11° incidence.

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Mid-infrared large-aperture metalens design verification and double-layer micro-optical system optimization
  • Article
  • Full-text available

April 2024

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50 Reads

Optical Materials Express

Optical Materials Express

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Lei Xin

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Zhongming Yang

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In this article, we explored the design and simulation techniques of large-aperture metalenses, and the optimization design methods of metalenses. For verification and experimental demonstration, a centimeter-scale aperture single-layer metalens and a field of view optimized metalens doublet,composed of subwavelength-spaced Si nanopillars with an operating wavelength of 3.77 µm were designed and manufactured. Finally, the focusing performance of the two under narrow-band laser irradiation was characterized, and an imaging demonstration of the metalens doublet was performed under an optical bandwidth of 250 nm (3500-3750 nm). We envision that the calculation, design, sample manufacturing and demonstration research on large-aperture metalens presented here will provide an important reference for the design and verification of large-aperture metasurface lenses or special metasurface devices in the future, such as large-aperture compact multifunctional metalens optical equipment for low-load special application systems like airborne, spaceborne, missile, satellite and deep sea.

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