Adjustable and controllable reflection type terahertz polarization converter based on vanadium dioxide
A polarization converter, vanadium dioxide technology, applied in polarization elements, instruments, optics, etc., to achieve the effect of easy operation, simple and convenient active control, flexibility and extensiveness
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Embodiment 1
[0047] In order to achieve the above object, the technical solution adopted in the embodiment of the present invention:
[0048] 1. The unit structure size of the reflective terahertz polarization converter based on vanadium dioxide is 100 μm × 100 μm, which is an obliquely symmetrical rectangle composed of aluminum metal reflective layer, polyimide dielectric layer, aluminum and vanadium dioxide The resonant ring is composed of a periodic structure arrangement in the x and y directions, and the specific unit structure period can be determined according to the actual situation.
[0049] Among them, the thickness t of the aluminum metal layer 1 =200nm, the thickness t of the polyimide dielectric layer 2 =30μm, the specific parameters of the obliquely symmetrical rectangular resonant ring see figure 2 .
[0050] 2. The structure is designed by using an oblique symmetrical metal resonant ring. When the conductivity is low (10S / m) and high conductivity (200000S / m), the ring cu...
Embodiment 2
[0056] The scheme in embodiment 1 is further introduced below in conjunction with specific numerical values, see the following description for details:
[0057] A vanadium dioxide-based tunable reflective terahertz polarization converter consists of a three-layer structure, including: thickness t 1 = 200nm aluminum reflective layer, thickness t 2 =30μm polyimide dielectric layer, obliquely symmetrical rectangular resonant ring composed of aluminum and vanadium dioxide. The thickness of the rectangular resonant ring is t 1 = 200nm. (see image 3 As shown in (b), the period P of the unit structure is 100 μm.
[0058] see figure 2 , In the embodiment of the present invention, there is an obliquely symmetrical rectangular resonant ring, and the rectangular ring is composed of two obliquely symmetrical U-shaped rings made of aluminum metal and phase change material vanadium dioxide wire grid. Thickness is t 1 = 200nm. Among them, the structural parameters of the aluminum m...
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