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Sub-wavelength grate structure polarizing film and its manufacture method

A technology of sub-wavelength grating and grating structure is applied in the field of polarizers and polarizers with sub-wavelength grating structures, which can solve the problem of not giving extinction performance, and achieve the advantages of improving light energy utilization efficiency, high extinction ratio, and reducing processing costs. Effect

Inactive Publication Date: 2008-10-22
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent mainly analyzes the influence of the increased low refractive index region on the transmission performance of the polarizer, and does not give its influence on the extinction performance

Method used

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  • Sub-wavelength grate structure polarizing film and its manufacture method
  • Sub-wavelength grate structure polarizing film and its manufacture method
  • Sub-wavelength grate structure polarizing film and its manufacture method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] See attached figure 2 , is a schematic diagram of a subwavelength grating structure polarizer.

[0045] The transparent substrate 22 is made of glass or plastic film with a thickness of 500-1000um. The plastic can be polycarbonate (PC), polyvinyl chloride (PVC), polyester (PET), polymethylmethacrylate (PMMA) or polypropylene (BOPP).

[0046] The refractive index of the high refractive index medium layer 25 is greater than that of the substrate.

[0047] High refractive index medium layer 25 can be TiO 2 、 Ta 2 o 5 , ZnS and so on.

[0048] The dielectric grating 24 is made of plastic, which may be polycarbonate (PC), polyvinyl chloride (PVC), polyester (PET), polymethyl methacrylate (PMMA) or polypropylene (BOPP).

[0049] The metal layer 23 can be a gold, silver, copper, aluminum layer.

[0050] Wherein, the period p of the dielectric grating is less than or equal to 250nm;

[0051] The ratio F of the ridge width w of the dielectric grating to the period p is 0....

Embodiment 2

[0061] see figure 2 , adding a high refractive index dielectric layer (ZnS) between the substrate and the dielectric grating. The incident light 21 is visible light with a wavelength of 400nm-700nm and an incident angle of 0 degrees; the substrate 22 is polycarbonate film (PC) with a refractive index of 1.58; the metal layer 23 is aluminum; the dielectric grating 24 is PMMA with a refractive index of 1.48 ; The high refractive index medium layer 25 is ZnS with a refractive index of 2.4. The structural parameters of the polarizer are as follows: the thickness of the base is 1000um, the thickness h1 of the high refractive index medium layer is 0.04um, the height of the dielectric grating h2=0.1um, the height of the metal layer h3=0.07um, the period of the dielectric grating p=0.1um, Ridge width w=0.05um.

[0062] Under this condition, the relationship between the transmission efficiency of TM light and the wavelength is as follows Figure 4 shown. At 400nm wavelength, the t...

Embodiment 3

[0064] see figure 2 , adding a high refractive index dielectric layer (ZnS) between the substrate and the dielectric grating. The incident light 21 is visible light, the wavelength is 400nm-700nm, and the incident angle is 0 degrees; the substrate 22 is polyester film (PET), and the refractive index is 1.48; the metal layer 23 is aluminum; the dielectric grating 24 is PMMA, and the refractive index is 1.48; The high refractive index medium layer 25 is ZnS with a refractive index of 2.4. The structural parameters of the polarizer are as follows: the thickness of the base is 1000um, the thickness h1 of the high refractive index medium layer is 0.04um, the height of the dielectric grating h2=0.1um, the height of the metal layer h3=0.07um, the period of the dielectric grating p=0.1um, Ridge width w=0.05um.

[0065] Under this condition, the relationship between the transmission efficiency of TM light and the wavelength is as follows Figure 5 shown. At 400nm wavelength, the t...

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Abstract

The invention discloses a polaroid sheet with a subwavelength grating structure, which comprises a transparent substrate, a dielectric grating, a first metal layer and a second metal layer. The dielectric grating is provided with ridges and grooves which are periodically arranged at intervals, the first metal layer is covered on the ridges of the dielectric grating, the second metal layer is covered in the grooves of the dielectric grating, and the period of the dielectric grating is less than the wavelength of incident light. The invention is characterized in that: a high refractive index dielectric layer is arranged between the transparent substrate and the dielectric grating, and the refractive index of the high refractive index dielectric layer is between 1.6 and 2.4. The transmission efficiency and the extinction ratio of TM light of the polaroid sheet are improved by adding the high refractive index dielectric layer between the transparent substrate and the dielectric grating. In the whole visible light waveband, the polaroid sheet has high transmission efficiency, high extinction ratio, and wide incident angle range. In the process, a nano-imprint technique is adopted to process and produce, the production process is simple and convenient and is easy to operate, an etching process is not needed, and the processing cost is reduced.

Description

technical field [0001] The invention relates to a polarizer suitable for visible light, in particular to a polarizer with a sub-wavelength grating structure, which can be applied to the field of backlight display. Background technique [0002] Polarizer is a very important optical component used in liquid crystal display, optical measurement, optical communication and other systems, and has a very broad market. Polarizers with high extinction ratios, a wide range of incident angles, and very compact volumes are required in these systems. Traditional polarizers are too bulky, have complicated manufacturing processes, and only have a large extinction ratio in a small wavelength range, which can no longer meet the requirements of the display industry for light weight, ultra-thin, and low cost. Therefore, how to design a polarizer with a compact structure, easy processing, and high cost performance has become a research and development trend in this field. [0003] The researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G03F7/00
Inventor 周云陈林森叶燕周小红浦东林申溯魏国军解正东
Owner SUZHOU UNIV
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