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Liquid crystal based broadband negative refractive index device with adjustable temperature

A negative refractive index and liquid crystal technology, which is applied in instruments, polarizing elements, optics, etc., can solve the problems that cannot meet the application requirements of negative refractive index materials, and achieve the effect of large and dynamic adjustment of working frequency

Inactive Publication Date: 2013-06-05
陕西泰信电子科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, theoretical studies have shown that when the dielectric properties of liquid crystals change, the operating frequency amplitude modulation (frequency shift amplitude / center operating frequency) of negative refractive index materials is only 3%, which obviously cannot meet the application requirements of negative refractive index materials.

Method used

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  • Liquid crystal based broadband negative refractive index device with adjustable temperature
  • Liquid crystal based broadband negative refractive index device with adjustable temperature
  • Liquid crystal based broadband negative refractive index device with adjustable temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: use circuit board printing technology to etch the metal sheet 5 array of fishnet structure on one side of the copper clad laminate 1 with a thickness of 1.00mm, the size of the metal sheet 5 is: W=8.00mm, L=12.00mm, Px= 15.00mm, Py=10.00mm. Positioning holes 4 with a diameter of 1.00 mm are machined at the four corners of the copper clad laminate 1 . An epoxy glass plate with a thickness of 0.50 mm and the same size as the copper clad laminate 1 is selected, and a U-shaped bead 2 with a side width of 5.00 mm and a positioning hole 4 is prepared by using a numerical control machine tool. A polyimide liquid crystal aligning agent is coated on the side of the copper clad plate 1 with a metal sheet array by the spin coating method, and a film is formed by thermal curing by a stepwise heating method, and the polyimide film is oriented and rubbed with a dust-free cloth to obtain A polyimide liquid crystal alignment layer that aligns liquid crystal molecules ver...

Embodiment 2

[0051] Example 2: Using circuit board printing technology to prepare an array of metal sheets 5 with a fishnet structure on a copper-clad laminate 1 with a thickness of 1.00mm, the size of the metal sheets is: W=6.00mm, L=10.00mm, Px=15.00mm, Py = 8.00 mm. At the same time, positioning holes 4 with a diameter of 1.00 mm are machined at the four corners of the copper clad laminate 1 . Select an epoxy glass plate with a thickness of 0.40 mm and the same size as the copper-clad laminate 1, and use a CNC machine tool to prepare a U-shaped bead 2 with a side width of 5.00 mm, and machine the four corners of the U-shaped bead 2 into a positioning plate with a diameter of 1.00 mm. hole. A polyimide liquid crystal aligning agent is coated on the side of the copper-clad laminate 1 with a metal sheet array by the spin coating method, and a film is formed by thermal curing by a stepwise heating method, and the polyimide film is oriented and rubbed with a dust-free cloth to obtain A pol...

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Abstract

The invention discloses a liquid crystal based broadband negative refractive index device with adjustable temperature, and further discloses a production method of the liquid crystal based broadband negative refractive index device with adjustable temperature, aiming to solve the technical problem than a conventional negative refractive index device has a narrow working frequency band. In the technical scheme of the invention, liquid crystal is injected into a liquid crystal injection cavity formed by copper clad plates and U-shaped press strips, thereby ensuring the complete contact of the liquid crystal and a sheet metal; by utilizing the characteristic that the effective dielectric constant of the crystal liquid is influenced by ambient temperature, the capacitance and working frequency band of the negative refractive index device can be regulated to the largest extent by regulating the ambient temperature, so that the working frequency band of the negative refractive index device can change greatly with temperature. and the largest adjustment extent is up to 6.8%. The negative refractive index device can be used in novel electronic devices such as a flat lens and an invisibility cloak.

Description

technical field [0001] The invention relates to a negative refraction index device, in particular to a liquid crystal-based broadband temperature adjustable negative refraction index device, and also relates to a manufacturing method of the broadband temperature adjustable negative refraction index device. Background technique [0002] Negative refractive index materials exhibit a negative refraction effect that existing materials in nature do not have, and can be applied to the design and preparation of new electronic information components. However, ordinary negative refractive index materials can only work effectively in a certain frequency band, which greatly limits the application of negative refractive index materials. [0003] refer to Figure 9 , the document "Tunable fishnet metamaterials infiltrated by liquid crystals," AppliedPhysics Letters, 2010, vol.96, p.193103-1-193103-3," discloses a negative refractive index material based on a liquid crystal metal fishnet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13G02B5/30
Inventor 张富利张卫红王旭辰
Owner 陕西泰信电子科技股份有限公司
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