Lens and method for generating Bessel beam carrying orbital angular momentum based on super surface
A technology of orbital angular momentum and metasurface, applied in the direction of electrical components, antennas, etc., can solve the problems of high processing precision, poor integration effect, and low energy utilization rate, and achieve high energy utilization rate, easy integration, and thin thickness Effect
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[0027] Specific implementation mode 1: Combination figure 1 , figure 2 with Figure 5 to Figure 14 Detailed description of this embodiment, the lens for generating Bessel beams carrying orbital angular momentum based on the metasurface described in this embodiment includes m×n periodically arranged phase mutation units, and both m and n are positive integers;
[0028] Each phase mutation unit includes a substrate 1 and a metal layer 2 on the surface of the substrate. The metal layer includes two parts, one is a square metal layer in the center of the substrate 1, and the other is a rectangular metal frame surrounding the square metal layer. There is a gap in the center of the opposite side of the group, taking one side of the substrate as the x-axis, and the angle between the center of the gap and the center of the substrate and the positive x-axis is θ,
[0029] θ = 1 2 x 2 + y 2 s i n β + 1 2 l · a r c t a n ( y ...
Example Embodiment
[0046] Specific implementation manner two: combination image 3 This embodiment will be described in detail. This embodiment will further describe the lens for generating Bessel beams carrying orbital angular momentum based on the metasurface described in the first embodiment. In this embodiment, the substrate 1 is square with a side length of a, the side length of the square metal is 0.4a, the side length of the metal frame is 0.7a, the width is 0.06a, the length of the notch is 0.06a, and a is a positive number.
Example Embodiment
[0047] Specific embodiment three: This embodiment is a further description of the lens for generating Bessel beams carrying orbital angular momentum based on the metasurface described in the second embodiment. In this embodiment, both m and n are 35.
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