Optical polarizer structure and preparation method thereof, and method for controlling polarization conversion mode
A technology of polarizers and optics, applied in optics, optical elements, polarizing elements, etc., can solve problems such as changes, inability to realize polarization conversion modes, and difficulty in preparing multilayer chiral structures, and achieve the effect of simple structure and easy preparation
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Embodiment 1
[0051] Such as image 3 The optical polarizer structure shown is composed of multiple structurally identical S-shaped polarizer building blocks (such as figure 2 As shown) a planar chiral structure arranged in a rectangular periodic array; the S-shaped polarizer structural unit consists of a first horizontal body 1, a second horizontal body 2, a third horizontal body 3, a first vertical body 4 and a second vertical body 5 constitute an integrated structure.
[0052] The first horizontal body 1, the second horizontal body 2 and the third horizontal body 3 are arranged in parallel from top to bottom, the first vertical body 4 and the second vertical body 5 are parallel to each other, and the first vertical body 4 and the first horizontal body 1 vertical.
[0053] One end of the first vertical body 4 is connected with one end of the first horizontal body 1, and the other end of the first vertical body 4 is connected with one end of the second horizontal body 2; the other end o...
Embodiment 2
[0076] After the optical polarizer structure of the present invention is prepared based on the steps in Example 1, a calculation simulation test is performed by using the three-dimensional finite element method FEM calculation software COMSOL Multiphysics.
[0077] Such as Figure 4 As shown, it is the asymmetric transmission conversion spectrum diagram when the optical polarizer structure of the present invention is symmetrical in the x and y directions, and the parameters of the structure are set l 1 = l 2 = 250nm, d 1 = d 2 = 200nm, h = 60nm, w = 60nm, L = 500nm, the period of the whole structure is Px = Py = 600nm.
[0078] Its simulation results are as Figure 4 The conversion spectrum is shown, where T+- is LCP incident and receives RCP signal, and T-+ is RCP incident and receives LCP signal. Mode I can be seen from the figure: at λ = 720 nm, there is a clear difference between T-+ and T+-, resulting in a larger AT.
[0079] When preparing the structure...
Embodiment 3
[0081] The optical polarizer structure of this embodiment is asymmetrical in the x and y directions, and a calculation simulation experiment is performed by using the three-dimensional finite element method FEM calculation software COMSOL Multiphysics.
[0082] Such as Figure 5 As shown, it is the asymmetric transmission conversion spectrum diagram when the optical polarizer structure of this embodiment is asymmetrical in the x and y directions, and the parameters of the structure are set l 1 = 290nm, l 2 = 250nm, d 1 = d 2 = 200nm, h = 60nm, w = 60nm, L = 500 nm, the period of the whole structure is Px = Py = 600 nm.
[0083] Its simulation results are as Figure 5 In the conversion spectrum diagram shown, T+- is LCP incident and receives RCP signal, and T-+ is RCP incident and receives LCP signal. In addition to the red shift of mode I, a new mode II appears on the right side of mode I. At λ=1640 nm, T-+ shows a peak, while T+- shows a valley. That is, when ...
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Abstract
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