Terahertz metasurface magneto-optical Kerr polarization converter
A polarization converter and magneto-optical Kerr technology, applied in the field of terahertz science, can solve problems such as large loss and difficult production, achieve high application value, improve transmittance and linear polarization conversion rate, and have flexible format size The effect of the design
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[0022] The working principle and method of the present invention will be illustrated by the following examples:
[0023] The structure diagram of the device is as figure 1 As shown, figure 1 In (1) is the ferrite substrate, which is a YIG ferrite with a thickness of 100 μm. In this example, the dielectric constant of the ferrite is 12.9 and the ferrite resonance line width is 190 Oe. figure 1 (2) is a metal reflective backplane, and (3) is a box-shaped metal supersurface. The metal reflective backplane (2) is a gold film with a thickness of 500nm, and the box-shaped metal supersurface (3) is a metal box formed by etching on a gold film with a thickness of 500nm; the outer width of the square box is 20μm , The internal width is 10μm; the period along the X-axis and Y-axis directions is 25μm.
[0024] The basic working principle of the device is as follows: figure 2 As shown, in the bias magnetic field (4) along the +Z direction, the permeability μ of the gyro ferrite becomes a seco...
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