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• W2967276684 abstract "Vortex beam generation from a mid-infrared photonic chip was numerically demonstrated by engineering the phase front of a waveguide mode. Multi-level micro-spiral phase plates (SPPs) consisting of N segments were patterned on the waveguide facet. The micro-SPP introduced an annular phase change by 2π that converted the Hermite–Gaussian (HG) waveguide mode into Laguerre–Gaussian (LG) mode at topological charge ∣l∣ = 1. Using a 3D finite difference time domain simulation, we resolved the near-field optical phase map next to the micro-SPP and its far-field beam profile projected from the waveguide surface. The vortex beam formation was spectrally dependent. A uniform and symmetric donut-shaped pattern corresponding to an ideal vortex beam was created at λ = 3.1–3.3 μm. In addition, the HG → LG mode conversion efficiency was improved by increasing the number of segments, N. Thus, our micro-SPP enabled present photonic circuits to create vortex beams, which is critical for the development of optical interconnection and broadband communication." @default.
• W2967276684 created "2019-08-22" @default.
• W2967276684 creator A5012756635 @default.
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• W2967276684 date "2019-09-13" @default.
• W2967276684 modified "2023-09-27" @default.
• W2967276684 title "Efficient mid-Infrared vortex beam generation using optical waveguides integrated with micro-spiral phase plates" @default.
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• W2967276684 doi "https://doi.org/10.1088/2040-8986/ab3b25" @default.
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