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Sub-wavelength grating structure polarizer

A sub-wavelength grating and polarizer technology, which is applied to polarizing elements and other directions to achieve the effects of flexible design, improved transmission efficiency, and improved transmission efficiency.

Active Publication Date: 2015-04-15
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transmission efficiency of TM light in the broadband (400-700nm band) needs to be improved

Method used

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  • Sub-wavelength grating structure polarizer
  • Sub-wavelength grating structure polarizer
  • Sub-wavelength grating structure polarizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The incident light 25 is visible light with a wavelength of 400nm-700nm; the substrate 21 is polyester film (PET) with a refractive index of 1.48; the dielectric grating 22 is polymethyl methacrylate (PMMA) with a refractive index of 1.48; the first metal layer 23 and the second metal layer 24 are aluminum. The structural parameters of the polarizer are as follows: the height of the dielectric grating h1=0.07um, the height of the metal layer h2=0.05um, the period of the dielectric grating p=0.1um, the width of the ridge w=0.04um, and the duty ratio F=w / p =0.4. When A=d=0.0075um and A=d=0um, the relationship between the transmission efficiency, extinction ratio and wavelength of TM light is as follows image 3 , Figure 4 shown.

[0039] From image 3 It can be seen that when A=d=0um (that is, the width of the first metal layer is equal to the width of the ridge of the dielectric grating, and the width of the second metal layer is equal to the width of the groove of t...

Embodiment 2

[0043] In this embodiment, when A=d=0.0075um (that is, the width of the first metal layer is greater than the width of the ridge of the dielectric grating, and the width of the second metal layer is smaller than the width of the groove of the dielectric grating), the impact of the change of the incident angle on the TM light The influence of the transmission efficiency, other parameters are consistent with those in the first embodiment. The incident angle of the incident light varies from 0 to 60 degrees. Figure 5 It is the relationship diagram of transmission efficiency of TM polarized light with incident wavelength and incident angle. Figure 6 It is the relationship diagram of the transmission extinction ratio of TM polarized light with incident wavelength and incident angle.

[0044] From Figure 5 It can be seen that when the incident angle of the incident light varies from 0 to 60 degrees, the transmission efficiency of TM polarized light in the entire visible light b...

Embodiment 3

[0047] In this embodiment, the period of the dielectric grating is increased, and the transmission efficiency and transmission extinction ratio of TM light vary with wavelength, and other parameters are consistent with those in Embodiment 1. The period of the dielectric grating is p=0.18um.

[0048] The incident light 25 is visible light with a wavelength of 400nm-700nm; the substrate 21 is polyester film (PET) with a refractive index of 1.48; the dielectric grating 22 is PMMA with a refractive index of 1.48; the first metal layer 23 and the second metal layer 24 are aluminum. The structural parameters of the polarizer are as follows: the height of the dielectric grating h1=0.07um, the height of the metal layer h2=0.05um, the width of the ridge of the dielectric grating w=0.072um, and the duty ratio F=w / p=0.4. When A=d=0.0075um and A=d=0um, the relationship between the transmission efficiency, extinction ratio and wavelength of TM light is as follows Figure 7 , Figure 8 s...

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Abstract

The invention discloses a sub-wavelength grating structure polarizer which comprises a transparent substrate, a dielectric grating, a first metal layer and a second metal layer, wherein the dielectric grating comprises a ridge part and a groove which are periodically formed at intervals; the first metal layer is positioned on the ridge part of the dielectric grating; the second metal layer is positioned in the groove of the dielectric grating; the period of the dielectric grating is less than the incident wavelength; the width of the first metal layer is greater than the width of the ridge part of the dielectric grating; the width of the second metal layer is smaller than that of the groove of the dielectric grating; and the height of the ridge part of the dielectric grating is greater than the height of the first metal layer and the second metal layer. Compared with the conventional dual-layer metal grating structure, the sub-wavelength grating structure polarizer has the advantages that the width of the first metal layer is greater than the width of the ridge part of the dielectric grating, and the width of the second metal layer is smaller than the width of the groove of the dielectric grating, so that more energy is centralized between the first metal layer and the second metal layer, and finally, the transmission efficiency of the broadband large-incident angle range TM polarized light is improved.

Description

technical field [0001] The invention relates to a polarizer, in particular to a polarizer with a sub-wavelength grating structure, which can be applied to liquid crystal display, optical communication and other fields. 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 complex manufacturing processes, and only have a large extinction ratio in a small wavelength range, which can no longer meet the requirements of light weight, ultra-thin, and low cost in industries such as display and optical communications. Therefore, how to design a polarizer with a compact structure, easy processing, and high cost performance has become a research and development trend in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
Inventor 周云陈林森申溯叶燕
Owner SUZHOU UNIV