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Controllable chiral structure based on GST phase change material temperature control and control method

A technology of chiral structure and temperature control, applied in nonlinear optics, instruments, optics, etc., can solve problems such as inability to reconfigure, reduce practical performance, etc., achieve powerful functions, good circular dichroism, and large working wavelength range Effect

Active Publication Date: 2020-11-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the optical response of the device is also affected by factors such as the structure and size of the metamaterial, and its inability to be reconfigured also greatly reduces its practical performance.

Method used

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  • Controllable chiral structure based on GST phase change material temperature control and control method
  • Controllable chiral structure based on GST phase change material temperature control and control method
  • Controllable chiral structure based on GST phase change material temperature control and control method

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Embodiment 1

[0033] Such as figure 1 As shown, a controllable chiral structure based on the temperature control of GST phase change materials, including a gold substrate 3, a silicon dioxide film 2 on the surface of the gold substrate 3, and chiral GST prepared on the surface of the silicon dioxide film 2 array1. Wherein, the unit of the chiral GST array 1 is composed of two cuboid GSTs, and the two cuboids GST overlap in the longitudinal direction, that is, the unit is a mirror-image asymmetric GST structure.

[0034] The thickness of the rectangular parallelepiped GST is 140 nanometers, the length is between 565 nanometers and 915 nanometers, and the width is 160 nanometers. The longitudinal overlapping length of two rectangular parallelepiped GSTs is 50 nanometers. The unit lateral period of the chiral GST array 1 is 400 nanometers, and the vertical period is between 1.1 μm and 1.8 μm. The silicon dioxide thin film 2 has a thickness of 120 nanometers, and the gold substrate 3 has a th...

Embodiment 2

[0041] Such as Figure 4 As shown, a controllable chiral structure based on the temperature control of GST phase change materials, including a gold substrate 3, a silicon dioxide film 2 located on the surface of the gold substrate 3, and a mirror image chirality is prepared on the surface of the silicon dioxide film 2 GST array4. Such as Figure 4 As shown in the middle dotted line box, the unit of the mirror-image chiral GST array 4 is composed of a pair of mirror-image GST chiral structures, each GST chiral structure is composed of two cuboid GSTs, and the two cuboid GSTs overlap in the longitudinal direction.

[0042] The thickness of the rectangular parallelepiped GST is 140 nanometers, the length is between 565 nanometers and 915 nanometers, and the width is 160 nanometers. The longitudinal overlapping length of two rectangular parallelepiped GSTs is 50 nanometers. The unit lateral period of the mirror-image chiral GST array 4 is 400 nanometers, and the vertical period ...

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Abstract

The invention discloses a controllable chiral structure based on GST phase change material temperature control and a control method. The structure is composed of periodic units, and each unit is composed of a GST micro-nano structure, a silicon dioxide film and a gold substrate. By preparing the GST array with chirality on the silicon dioxide thin film, the device can show circular dichroism in anear-infrared band, and quasi-linear adjustment of the circular dichroism can be achieved by changing the temperature of GST. Besides, the mirror image chiral GST array is placed in the unit structure, and temperature control is performed on GST structures with different chirality so that inversion of circular dichroism can be realized. Compared with an existing chiral metamaterial structure, thestructure has the advantages of being simple in structure, powerful in function, large in adjustable wavelength range, capable of achieving dynamic adjustment and control and the like.

Description

technical field [0001] The invention relates to a controllable chiral structure and a control method based on temperature control of a Ge2Sb2Te5 (GST) phase change material. Background technique [0002] A phase change material is a special material whose lattice structure changes with temperature. Under the direct action of an external electric field or thermal stimulus, the temperature rise inside the material will cause the internal structure to transform from an amorphous state to a crystalline state, and With the change of a series of material physical properties such as refractive index, electrical conductivity and Young's modulus, it is widely used in related technologies such as phase change memory and display. Germanium antimony tellurium alloy GST is a commonly used phase change material. When heated to 150 ° C, it changes from amorphous to cubic crystals, and to hexagonal crystals at 200 ° C. After the heat source is removed, the lattice state of the GST material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/00G02F1/01
CPCG02F1/0063G02F1/009G02F1/0136
Inventor 芮光浩丁传传顾兵崔一平
Owner SOUTHEAST UNIV
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