研究目的
To propose and demonstrate an all-dielectric metasurface for generating polarization-sensitive modulated optical vortices (MOVs) to overcome the limitations of bulky and static traditional devices, enabling dynamic control and miniaturization for applications in optical manipulation and communication.
研究成果
The all-silicon metasurface successfully generates polarization-controlled MOVs with dynamic tunability by adjusting the incident polarization. It offers advantages of miniaturization, easy design, and fabrication over traditional bulky devices, with potential applications in optical manipulation and communication systems. Future work could involve extending to multiple OV generation and other electromagnetic spectra.
研究不足
The experimental results show discrepancies from simulations due to non-uniform laser spots, fabrication errors, and imperfect normal incidence. The metasurface is limited to generating two OVs simultaneously and operates specifically at mid-infrared wavelengths, with potential for extension to other bands but not demonstrated here.
1：Experimental Design and Method Selection:
The study uses an all-dielectric metasurface composed of silicon pillars on a silicon substrate to generate MOVs. The phase profile is designed with a tangential modulation factor for wavefront shaping, and numerical simulations are performed using CST Microwave Studio to model the electromagnetic response.
2：Sample Selection and Data Sources:
Three samples are fabricated with different geometric parameters for the silicon pillars, operating at a wavelength of
3：6 μm. The samples are designed to produce specific MOV patterns for orthogonal polarizations. List of Experimental Equipment and Materials:
A mid-infrared CO2 laser (tunable from
4：3 μm to 7 μm), adjustable attenuator, beam expander, linear polarizer, aperture, infrared CCD (UA330, Guide-Infrared Inc.), and fabricated silicon metasurface samples. Experimental Procedures and Operational Workflow:
The laser beam is expanded, polarized, and directed onto the sample. Transmitted intensity patterns are recorded at the focal plane using the infrared CCD. Measurements are taken for different polarization angles (0°, 45°, 90°).
5：Data Analysis Methods:
The intensity patterns are analyzed to verify the generation of doughnut and actinomorphic vortex beams, with comparisons to simulations for validation.
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