The macroscopic size of conventional optical components based on refractive optics significantly limits the miniaturization of optical systems. In addition, the dispersive response of bulk materials introduces strong chromatic aberrations. Metasurfaces, ultrathin devices composed of subwavelength array resonators can effectively overcome this problem. [1][2][3][4][5] Low-efficiency
Multi-stage four-wave mixing governed by orbital angular momentum selection rules enables all-fiber generation of visible light at 659 nm that is power-scalable.
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