Metasurface-based perfect vortex beam for optical eraser

Metasurface-based perfect vortex beam for optical eraser

(2024)7:36 | Vin-Cent Su, Chia-Hung Chiang, Meng-Hsin Chen, Kai-Lun Xu, Shao-Yang Huang
This study presents the development and characterization of metasurface-based perfect vortex beams (MPVBs) with topological charges (TCs) of approximately 32 and 16 in the visible spectrum. MPVBs are designed to overcome the limitations of conventional vortex beams, which have smaller TCs and are composed of bulky optical components, making them difficult to integrate with CMOS fabrication processes. The researchers used gallium nitride (GaN) and double-polished sapphire substrates to fabricate high-aspect-ratio meta-structures, achieving the desired TCs. The MPVBs exhibit broadband operation, with distinct annular intensity distributions at various wavelengths from 450 to 650 nm. The pre-convergence behavior of the MPVBs, characterized by flower-like interference patterns, ensures uniform annular diameters in the x-y plane beyond the focal distance. The optical eraser experiment, involving a Mach-Zehnder interferometer, demonstrates the potential of MPVBs in quantum optics and optical device engineering, showing the ability to erase and restore interference patterns, thus advancing the understanding of quantum phenomena. The successful integration of MPVBs into optical eraser experiments highlights their significance in both quantum optics and optical device engineering.This study presents the development and characterization of metasurface-based perfect vortex beams (MPVBs) with topological charges (TCs) of approximately 32 and 16 in the visible spectrum. MPVBs are designed to overcome the limitations of conventional vortex beams, which have smaller TCs and are composed of bulky optical components, making them difficult to integrate with CMOS fabrication processes. The researchers used gallium nitride (GaN) and double-polished sapphire substrates to fabricate high-aspect-ratio meta-structures, achieving the desired TCs. The MPVBs exhibit broadband operation, with distinct annular intensity distributions at various wavelengths from 450 to 650 nm. The pre-convergence behavior of the MPVBs, characterized by flower-like interference patterns, ensures uniform annular diameters in the x-y plane beyond the focal distance. The optical eraser experiment, involving a Mach-Zehnder interferometer, demonstrates the potential of MPVBs in quantum optics and optical device engineering, showing the ability to erase and restore interference patterns, thus advancing the understanding of quantum phenomena. The successful integration of MPVBs into optical eraser experiments highlights their significance in both quantum optics and optical device engineering.
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