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- W2980789130 abstract "Dielectric nanoantennas have emerged in recent years as a promising platform for nanoscale second-harmonic generation (SHG) light sources and as building blocks for SHG metasurfaces. The group of III-V semiconductor materials with zincblende (ZB) crystal structure has played a key role in this development since it contains materials that feature high refractive indices and low losses in the near infrared (NIR), and strong second-order nonlinearities owing to the broken inversion symmetry in these crystals. However, one drawback of these materials is the peculiar nature of the second-order nonlinear susceptibility χ ijk (2) where i, j and k relate to the major crystalline axes [100], [010] and [001]. Its components are only nonzero for i ≠ j ≠ k ≠ i. This commonly leads to doughnut-shaped radiation patterns with zero power radiated along the optical axis for SHG nanocylinders fabricated from (100) wafers, where the crystal axes align with the laboratory frame defined by the nanocylinder orientation [1,2]. In order to attain higher directivity along the optical axis and hence improving collection efficiency, the system's symmetry has to be reduced [2,3]." @default.
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- W2980789130 date "2019-06-01" @default.
- W2980789130 modified "2023-10-16" @default.
- W2980789130 title "Second-Harmonic Generation in (111) Gallium Arsenide Nanoantennas" @default.
- W2980789130 doi "https://doi.org/10.1109/cleoe-eqec.2019.8872198" @default.
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