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- W2912448130 abstract "Emerging applications of optical vortex beams demand large amount of integrated devices with high performance. We demonstrate that artificial Silicon nanoparticle arrays with different geometric parameters can control the wavefront of incident optical beams with high transmittance, realizing $pmb{2pi}$ phase shift coverage of transmitted waves. Four different nanoparticle arrays exhibiting 0, $pmb{pi/2, pi,}$ and $pmb{3pi/2}$ transmitted phase shifts are designed by using both different nanoparticles and lattice constants. The four arrays provide a series of phase shifts spaced by π/2; then, the metadevice is spatially organized in quadrants in order to transform a Gaussian beam into a vortex beam at visible frequencies. Simulated results are presented. Approach in this paper offers an alternative method for realizing optical vortex beams, and it is foreseeable that reconfigurable metadevices to control the wavefront can be realized by using liquid crystals." @default.
- W2912448130 created "2019-02-21" @default.
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- W2912448130 date "2018-11-01" @default.
- W2912448130 modified "2023-09-26" @default.
- W2912448130 title "Silicon Metadevices for Vortex Beam Generation at Visible Frequencies" @default.
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- W2912448130 doi "https://doi.org/10.23919/apmc.2018.8617641" @default.
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