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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

Inactive Publication Date: 2019-07-26
NANKAI UNIV
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a terahertz metasurface magneto-optical Kerr polarization converter capable of high transmittance and high Q value to achieve high polarization linear polarization conversion function, and the structure is simple and easy to process, in order to solve the background Key technical issues in technology such as large magnetic field, low temperature operation, large loss, and difficult production

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[0022] Working principle and method of the present invention are illustrated by following examples below:

[0023] The schematic diagram of the device structure is shown in figure 1 as shown, figure 1 In (1) is the ferrite substrate, which is YIG ferrite with a thickness of 100 μm. In this example, the dielectric constant of ferrite is 12.9, and the ferromagnetic resonance linewidth is 190 Oe. figure 1 (2) in (2) is a metal reflective backplane, (3) is a square metal metasurface. The metal reflective backplane (2) is a gold film with a thickness of 500nm, and the frame-shaped metal metasurface (3) is a metal frame formed by etching on the gold film with a thickness of 500nm; the outer width of the square frame is 20 μm , the inner width is 10 μm; the period along the X-axis and Y-axis direction is 25 μm.

[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...

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Abstract

The invention discloses a terahertz metasurface magneto-optical Kerr polarization converter. Metal reflection back plates and square metal metasurface structures are attached on two sides of a YIG ferrite to form a fabry-perot cavity microcavity structure, so that incident terahertz wave generates resonance in the cavity, and a magneto-optical Kerr effect of the YIG ferrite (1) is greatly improved; compared with the structure without the metal metasurface, the optical rotation angle and the polarization conversion rate of the terahertz wave are increased. The terahertz metasurface magneto-optical Kerr polarization converter is capable of rotating the polarization state of original linear polarization to a certain angle; a function of converting orhtogonal linear polarization is achieved when the magnetization intensity reaches 4000Gs; an obvious frequency spectrum with a high Q value and high transmittance is shown; the maximum transmittance and polarization conversion rate are greaterthan 80%; and the Q value is greater than 70.

Description

technical field [0001] The invention belongs to the field of terahertz science and technology, and in particular relates to a reflective terahertz linear polarization conversion device with high Q value, high transmittance and high degree of polarization. Background technique [0002] Terahertz (THz) waves usually refer to the frequency range of 0.1-10THz (1THz=10 12 Hz) range, because of its excellent special properties, it has a very broad application prospect in the fields of wireless communication, radar, non-destructive testing, medical imaging, security inspection and anti-terrorism. THz functional devices, such as modulators, filters, absorbers, polarizers, and isolators, are essential components of THz application systems. Magneto-optical materials have been widely used in the development of THz functional devices due to their unique Faraday rotation optical effect and magneto-optical Kerr effect. Common magneto-optical materials include InSb, YIG ferrite, HgTe, etc...

Claims

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Application Information

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IPC IPC(8): G02F1/01G02F1/09G02F1/00G02B1/00
CPCG02B1/002G02F1/0036G02F1/0136G02F1/093
Inventor 穆倩怡范飞常胜江
Owner NANKAI UNIV
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