Holmium ferrite-based terahertz metamaterial and its preparation method and optical device

A holmium ferrite-based and metamaterial technology, applied in the field of terahertz metamaterials, can solve the problems of inability to adjust the ratio of Ho atoms to Fe atoms, cumbersome operation, and inflexibility, and achieve excellent controllability of the amplitude and frequency of terahertz electromagnetic waves Features, important application prospects, and the effect of avoiding large absorption losses

Active Publication Date: 2022-06-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resources of these precious metals on the earth are limited and the price is high, and metamaterials made of precious metals such as gold and copper will convert the energy of electromagnetic waves into heat energy and cause a large amount of energy loss. This unavoidable energy loss is associated with limited resources and high prices. collectively limit the widespread application of these noble metal metamaterials
[0004] Holmium ferrite-based material is a kind of composite oxide material, currently some studies use FeCl 3 ·6H 2 0 is iron source, Ho 2 o 3 As a holmium source, add NaOH and NaCl solids as sintering aids to activate the pH regulator to prepare holmium ferrite HoFeO 3 , but this method needs to be washed after sintering to remove other residual by-products, the operation is more cumbersome, and the iron salt FeCl 3 ·6H 2 0 is the ratio of Ho atoms and Fe atoms in the material prepared by iron source can only be 1:1, and the ratio of Ho atoms to Fe atoms cannot be adjusted. The adjustable range is limited, not flexible enough to meet more flexible adjustable needs

Method used

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  • Holmium ferrite-based terahertz metamaterial and its preparation method and optical device
  • Holmium ferrite-based terahertz metamaterial and its preparation method and optical device
  • Holmium ferrite-based terahertz metamaterial and its preparation method and optical device

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Embodiment 1

[0029] This embodiment provides a holmium ferrite-based terahertz metamaterial, and the terahertz metamaterial is a grating structure and is prepared according to the following steps:

[0030] (1) Mix 1moL iron oxide and 1moL holmium oxide to form a raw material mixture, and then perform the first sintering at 900 °C to form a holmium ferrite-based material HoFeO 3 , and then ball milled at 3000r / min to form powder;

[0031] (2) Take the holmium ferrite-based material HoFeO in step (1) 3 powder, add the aqueous solution of polyvinyl alcohol and uniformly mix to form a slurry, wherein, in the slurry, the holmium ferrite-based material HoFeO 3 The mass fraction is 90%, and then the above slurry is printed and formed by 3-D direct writing equipment, and then sintered for a second time at 1400 ° C for 4 hours. The obtained holmium ferrite-based terahertz metamaterial is a long strip material. The grating structure is formed, the sample size of the grating structure is 10mm × 10m...

Embodiment 2

[0034] The present embodiment provides a ferrite-based terahertz metamaterial, and the ferrite-based terahertz metamaterial has a face-centered cubic structure and is prepared according to the following steps:

[0035] (1) Mix 1moL of iron oxide and 1moL of holmium oxide to form a raw material mixture, and then perform first sintering at 900°C to form HoFeO, a holmium ferrite-based material 3 , and then ball milled at 3000r / min to form powder;

[0036] (2) Take the holmium ferrite-based material HoFeO in step (1) 3 powder, add the aqueous solution of polyvinyl alcohol and uniformly mix to form a slurry, wherein, in the slurry, the holmium ferrite-based material HoFeO 3 The mass fraction is 90%, then 3-D direct writing equipment is used to print the slurry layer by layer, and then the second sintering is performed at 1400 ° C for 4 hours to obtain the holmium ferrite-based terahertz metamaterial as a long strip material. The face-centered cubic structure is formed. The sample...

Embodiment 3

[0039] This embodiment provides a holmium ferrite-based terahertz metamaterial, and the terahertz metamaterial is a grating structure and is prepared according to the following steps:

[0040] (1) Mix 0.8moL iron oxide and 1.2moL holmium oxide to form a raw material mixture, and then perform the first sintering at 900°C to form a holmium ferrite-based material Ho 1.2 Fe 0.8 O 3 , and then ball milled at 3000r / min to form powder;

[0041](2) Take the holmium ferrite-based material ceramic powder Ho in step (1) 1.2 Fe 0.8 O 3 Powder, add the aqueous solution of polyvinyl alcohol and uniformly mix to form a slurry, wherein, in the slurry, the holmium ferrite-based material ceramic powder Ho 1.2 Fe 0.8 O 3 The mass fraction is 90%, then 3-D direct writing equipment is used to print the paste layer by layer, and then the second sintering is performed at 1400 ° C for 4 hours to obtain the holmium ferrite-based terahertz metamaterial as a grating structure. The sample size of...

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Abstract

The invention discloses a holmium ferrite-based terahertz supermaterial, a preparation method thereof and an optical device. The preparation method of the holmium ferrite-based terahertz supermaterial comprises the following steps: (1) weighing iron oxide and Holmium oxide is mixed to form a raw material mixture, and then sintered for the first time to form a holmium ferrite-based material; (2) shaping the holmium ferrite-based material. The present invention uses iron oxide and holmium oxide as raw materials to prepare an all-dielectric-based metamaterial with an adjustable ratio of Ho atoms to Fe atoms, which can more flexibly regulate the amplitude and frequency of the terahertz metamaterial, and also avoids the existing use of The problem of high absorption loss of electromagnetic waves caused by noble metal metamaterials.

Description

technical field [0001] The invention relates to the technical field of terahertz metamaterials, in particular to a holmium ferrite-based terahertz metamaterial, a preparation method and an optical device. Background technique [0002] Terahertz is an electromagnetic band between 0.1THz and 10THz in the far-infrared and microwave bands. Terahertz technology has important potential applications in various industries such as national security, aerospace, biological and defense industries. [0003] Terahertz metamaterials are new materials whose synthesis is still developing. The frequency of interaction with it is terahertz, and the frequency range used to study materials is generally set at 0.1-10THz. Traditional terahertz metamaterials are made of precious metals such as gold and copper. However, these precious metals have limited resources and high prices on earth, and metamaterials prepared from precious metals such as gold and copper will convert the energy of electromagn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622G02B1/00
CPCC04B35/2675C04B35/622G02B1/002C04B2235/3272C04B2235/3224C04B2235/6026C04B2235/656C04B2235/6567C04B2235/762C04B2235/95
Inventor 李勃曾新喜张晗王荣朱朋飞周济
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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