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Reflection type color filter

A color filter, reflective technology, applied in optics, optical components, instruments, etc., can solve the problems of unfavorable energy saving and environmental protection, low utilization rate of light energy, etc., to improve the utilization rate of light energy and reduce the sensitivity of angle. Effect

Inactive Publication Date: 2012-11-21
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this kind of filter absorbs light waves of most colors, its light energy utilization rate is relatively low, only about 30%, which is not conducive to energy saving and environmental protection.

Method used

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Examples

Experimental program
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Embodiment 1

[0047] In this embodiment, the formation of a magenta grating structure is taken as an example for illustration.

[0048] Please continue to see figure 2 , in this embodiment, the substrate 110 is a flexible material, specifically PET or PC. Metal layer 120 is aluminum. The material of the dielectric layer 130 is PMMA. The material of the metal grating layer 140 is aluminum. Further, the periods of the dot-matrix metal grating 120 in the X direction and the Y direction are both px=py=p, and the duty ratio is F. The following structural parameters are obtained for the magenta reflective filter design: period p=190nm, duty ratio F=0.45. The thickness of the metal layer h1 = 150 nm. The dielectric layer thickness h2=15nm. The thickness h3 of the metal grating layer is 25 nm.

[0049] TM polarized light and TE polarized light are incident from the top of this structure. The incident angle of light varies from 0° to 45°. The reflection characteristics and angle tolerance ...

Embodiment 2

[0054] In this embodiment, different color filter structures corresponding to different duty ratios are studied. In this embodiment, the duty ratio of the pixel structure takes three values ​​of 0.33, 0.44, and 0.55 respectively, while other parameters remain unchanged. The thickness of the layer h1 = 150 nm. The dielectric layer thickness h2=15nm. The thickness h3 of the metal grating layer is 25 nm.

[0055] See Figure 6 , Figure 6 It is the relationship diagram of reflection efficiency of TM light with incident wavelength and duty ratio. When F changes between 0.33 and 0.55, the position of the reflection valley changes. For example, when F=0.33, the blue light close to 450nm is absorbed, and the light in other bands is reflected, so that the color of the light reflected by the pixel structure under this duty ratio is yellow; when F=0.44, close to The green light at 550nm is absorbed, while the light in other bands is reflected, so that the color of light reflected ...

Embodiment 3

[0057] In this embodiment, different color filter structures corresponding to different metal grating periods are studied. In this embodiment, the periods of the metal gratings in the pixel structure are 0.15um, 0.19um, and 0.23um respectively, and other parameters are consistent with those in the first embodiment. That is, the duty ratio F=0.45, and the thickness h1 of the metal layer=150nm. The dielectric layer thickness h2=15nm. The thickness h3 of the metal grating layer is 25 nm.

[0058] See Figure 7 , Figure 7 It is the relationship diagram of the reflection efficiency of TM light with the incident wavelength and period. When p changes between 0.15 and 0.23um, the position of the reflection valley changes. For example, when p=0.15um, the blue light close to 450nm is absorbed, while the light in other bands is reflected, so that the color of the light reflected by the pixel structure under this duty ratio is yellow; when p=0.19um , the green light close to 550nm ...

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Abstract

The invention relates to a reflection type color filter, comprising pixel arrays with three colors. A pixel structure with each color comprises a substrate, a metal layer positioned on the substrate, a dielectric layer positioned on the metal layer and a two-dimensional metal grating layer positioned on the dielectric layer, wherein the thickness of the metal layer is greater than the skin depth of visible light in the metal layer, and the surface plasma resonance frequency of the pixel structure is the frequency of the complementary color of the pixel color. The reflection type color filter performs optical filtering based on the subtractive theorem, and has the characteristics of high optical energy utilization rate, low angle sensitivity and insensitivity to polarization.

Description

technical field [0001] The invention relates to an optical filter element, in particular to a wide-angle reflective filter with a grating structure. Background technique [0002] Inspired by the selection of light by the biological skin structure in nature, people found that the nanostructure can realize the three primary colors of the color filter device, and has a certain spectral width and viewing angle latitude. If it is possible to artificially design and prepare specific nanostructures to achieve color filtering, it will achieve the purpose of energy saving and environmental protection in industries such as light display, photovoltaics, light sensing, light detection and ink-free printing. [0003] With the continuous development of micro-nano manufacturing technology, the design and fabrication of color filter devices has become a hot research direction in the field of micro-nano optics. Most of the existing micro-nano structure filters are very sensitive to the inci...

Claims

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Application Information

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IPC IPC(8): G02B5/26
Inventor 周云陈林森叶燕申溯
Owner SUZHOU UNIV
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