研究目的
Investigating the diffraction of vortex beams shifted from the optical axis by a circular grating or a binary diffractive axicon, focusing on the effects of numerical aperture and vortex phase order.
研究成果
The study demonstrates the effects of numerical aperture and vortex phase order on the diffraction patterns of vortex beams. For a numerical aperture NA = 0.95, two cones are formed for the case m = 1, while for NA = 0.5, the second cone is less pronounced. The findings provide insights into the behavior of vortex beams in diffractive optical systems.
研究不足
The study is limited to numerical simulations using the FDTD method, and the results may vary with physical experiments. The computational resources required for high-performance computing may also be a constraint.
1：Experimental Design and Method Selection:
The study uses the finite difference time domain (FDTD) method for numerical simulation of diffraction in a 3D model.
2：Sample Selection and Data Sources:
The input field is an optical vortex diffracted by the axicon, with parameters including wavelength λ = 0.532 microns and computational domain size x, y, z ∈ [–3.8λ;
3：532 microns and computational domain size x, y, z ∈ [–8λ; 8λ]. List of Experimental Equipment and Materials:
3.8λ]. 3. List of Experimental Equipment and Materials: Computational cluster with a power of 850 GFlops.
4：Experimental Procedures and Operational Workflow:
Simulation includes setting up the computational domain, defining the input field, and applying the FDTD method to model diffraction.
5：Data Analysis Methods:
Analysis of the diffraction patterns formed by the vortex beams under different conditions.
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