A Metasurface Polarization Modulator
A metasurface and polarization technology, applied in instruments, nonlinear optics, optics, etc., can solve problems such as non-total reflection, signal loss, etc.
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Embodiment 1
[0023] Example 1. Metasurface Polarization Modulating Quarter Waveplate
[0024] Such as figure 1 and figure 2 In the shown metasurface polarization modulator, the material of the intermediate metal layer 1 is silver (Ag), and its thickness is h=20nm. The upper and lower insulating dielectric layers 2 are made of the same material, which is aluminum oxide (Al 2 o 3 ), the thickness of which is d=25nm. The top and bottom metal microstructure layer 3 materials are the same as the middle metal thin film layer 1, and are metal silver (Ag) particles, which are periodically attached to the insulating medium layer 2, and its thickness is t=60nm, and the microstructure unit period is 370nm. A wave plate is composed of several unit periodic structure arrays, such as figure 1 As shown, an array of 6×6 cell structures. The required phase difference can be obtained by adjusting the length and width of the metal microstructure of the top and bottom metal microstructure layer 3 He...
Embodiment 2
[0025] Embodiment 2. Metasurface polarization control half-wave plate
[0026] The metasurface polarization modulator realizes the function of half-wave plate, that is, it is required to realize the phase difference of the transmitted components in x direction and y direction in a certain band or frequency point And have a higher polarization conversion rate PCR hwp , where the polarization conversion rate is defined as PCR hwp =|t s-p | 2 / (|t s-p | 2 +|t s-s | 2 ), where t s-s , t s-p is the transmission coefficient, which respectively characterizes the ability of the s-polarized incident wave to keep the polarization state unchanged and transform the p-polarized transmitted wave after passing through the wave plate. Except that the length and width of the top and bottom metal microstructures are 190 nm and 130 nm, respectively, other structural parameters are exactly the same as those in Example 1. Figure 4 The phase difference of the x and y polarization transm...
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