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Holmium ferrite-based terahertz metamaterial, preparation method thereof and optical device

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

Active Publication Date: 2020-04-24
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, preparation method thereof and optical device
  • Holmium ferrite-based terahertz metamaterial, preparation method thereof and optical device
  • Holmium ferrite-based terahertz metamaterial, preparation method thereof and optical device

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Embodiment 1

[0029] This embodiment provides a holmium ferrite-based terahertz metamaterial, the terahertz metamaterial has 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 holmium ferrite-based material HoFeO 3 , and then crushed by ball milling under the condition of 3000r / min to form powder;

[0031] (2) Take the holmium ferrite-based material HoFeO in step (1) 3 powder, adding an aqueous solution of polyvinyl alcohol and uniformly mixing 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 the second time at 1400 ° C for 4 hours, and the obtained holmium ferrite-based terahertz metamaterial is a long strip material The grating structure formed, the sample size of t...

Embodiment 2

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

[0035] (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 holmium ferrite-based material HoFeO 3 , and then crushed by ball milling under the condition of 3000r / min to form powder;

[0036] (2) Take the holmium ferrite-based material HoFeO in step (1) 3 powder, adding an aqueous solution of polyvinyl alcohol and uniformly mixing to form a slurry, wherein, in the slurry, the holmium ferrite-based material HoFeO 3 The mass fraction is 90%, and then the slurry is printed layer by layer with 3-D direct writing equipment, and then the second sintering is carried out at 1400 ° C for 4 hours, and the holmium ferrite-based terahertz metamaterial is obtained as a long strip material The fa...

Embodiment 3

[0039] This embodiment provides a holmium ferrite-based terahertz metamaterial, the terahertz metamaterial has 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 holmium ferrite-based material Ho 1.2 Fe 0.8 o 3 , and then crushed by ball milling under the condition of 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, adding an aqueous solution of polyvinyl alcohol and uniformly mixing to form a slurry, wherein, in the slurry, holmium ferrite-based material ceramic powder Ho 1.2 Fe 0.8 o 3 The mass fraction is 90%, and then the slurry is printed layer by layer with 3-D direct writing equipment, and then the second sintering is carried out at 1400 ° C for 4 hours, and the holmium ferrite-based terahertz metamaterial is obtained a...

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Abstract

The invention discloses a holmium ferrite-based terahertz metamaterial, a preparation method thereof and an optical device. The preparation method of the holmium ferrite-based terahertz metamaterial comprises the following steps: (1) weighing iron oxide and holmium oxide according to a stoichiometric ratio, mixing to form a raw material mixture, and then carrying out first sintering to form a holmium ferrite-based material; and (2) molding the holmium ferrite-based material. Iron oxide and holmium oxide are used as raw materials to prepare the all-dielectric-based metamaterial with the adjustable ratio of Ho atoms to Fe atoms, the amplitude and frequency of the terahertz metamaterial can be flexibly regulated, and meanwhile the problem of large absorption loss of electromagnetic waves, caused by precious metal metamaterials used in the prior art, is solved.

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 thereof, 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 application values ​​in various industries such as national security, aerospace, biology and defense industries. [0003] Terahertz metamaterials (Terahertz metamaterials) is a new material whose synthesis is still developing. The frequency of interaction with it is terahertz. 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, 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...

Claims

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Application Information

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Patent Type & Authority Applications(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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