Large area photon sieve
A photon sieve and large-area technology, applied in the field of photon sieves, can solve problems such as difficulty in increasing the diameter of photon sieves
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Embodiment 1
[0038] Embodiment 1: A photon sieve with a new structure, diameter Φ=100mm, focal length f=500mm, working wavelength λ=632.8nm.
[0039] If the design method of the traditional photon sieve is adopted, the photon sieve required by this embodiment will have a period of 3940 rings, and the minimum aperture diameter will be 0.00318mm, such as image 3 shown. These parameters clearly pose a great challenge to current manufacturing processes.
[0040] This example figure 2 As shown, the photon sieve is divided into three regions,
[0041]
[0042] in w n = λf 2 r n is the small hole diameter of the photon sieve before merging (the small hole diameters of the three regions are respectively enlarged to 1.5, 4, and 6 times of the original), λ is the working wavelength, f is the focal length of the new photon sieve, f n is the distance from the ce...
Embodiment 2
[0049] For a photon sieve with f=500mm, D=50mm, and λ=632.8nm, the design scheme of the photon sieve of the present invention is adopted. Using the Gaussian density modulation function, after calculation, m=987 rings are divided into 3 areas, the number of rings after partitioning is 159, and the merging periods are 3, 5, and 8 respectively, as shown in the table below
[0050]
[0051] After optimization, σ f = 1.505, μ = 0, c = 0.8 and h = 2.75
[0052] With the new design scheme, the minimum hole diameter is changed from 63.28um to 279.07um.
Embodiment 3
[0054] For the photon sieve with f=500mm, D=50mm, λ=405nm, we use a new photon sieve design scheme. Using the Weber density modulation function, after calculation, m=1542 rings are divided into 4 areas, the number of rings after partitioning is 219, and the merging periods are 3, 5, 8, and 10 respectively, as shown in the table below
[0055]
[0056] In this embodiment, the density function is a Weibull function,
[0057] f ( r n ) = c α β f ( r n h · β f ) α - 1 e - ( ...
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