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Strip sub-wavelength aluminum metal polarization grating

A polarization grating, metal grating technology, applied in the field of applied optics, can solve problems such as measurement range limitation, and achieve the effect of improving the measurement range and stability

Inactive Publication Date: 2019-04-05
LONGYAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The measurement principle of the existing power optical transformer is based on Marius' law, that is, the rotation of the polarization plane of linearly polarized light is converted into the periodic fluctuation of the outgoing light intensity, so the measurement results have optical power correlation, and the measurement range is greatly limited

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  • Strip sub-wavelength aluminum metal polarization grating
  • Strip sub-wavelength aluminum metal polarization grating
  • Strip sub-wavelength aluminum metal polarization grating

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Embodiment Construction

[0022] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0023] see Figure 1 to Figure 7 As shown, the sub-wavelength metal grating 1 is a diffraction screen with a periodic spatial structure and has good polarization characteristics. The light wave component TE (Transverse Electric) wave parallel to the direction of the metal grating is reflected or absorbed, and the light wave perpendicular to it Component TM (Transverse Magnetic) waves pass through directly. Therefore, the polarization transmission direction of the sub-wavelength metal grating 1 depends on the direction of the metal grating bars. Utilizing this principle, the direction of the metal grid strips of the subwavelength metal grating 1 on the grating substrate 6 is regularly changed horizontally to obtain a strip-shaped subwavelength aluminum metal polarization grating, as shown in the attached figure 1...

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Abstract

The invention relates to a strip sub-wavelength aluminum metal polarization grating, and belongs to the technical field of applied optics. The strip sub-wavelength aluminum metal polarization gratinghas a length of 12mm and a width of 1.5mm, and is composed of 12000 aluminum metal grid units arranged in parallel, wherein in each unit, the grid direction changes for 60'' in turn, the grating period is 200nm, the duty cycle is 0.5, and the grating has a ridge thickness of 200mm. The grating has obvious polarization splitting function for the linearly polarized light having a wavelength greaterthan three times or more of the cycle, that is, the TE wave of an optical wave component parallel to the direction of the aluminum metal grid is reflected or absorbed, the TE wave of an optical wave component vertical thereto direct pass through, the transmittance of the TM wave of the grating is greater than 0.80, and the extinction ratio is greater than 34dB. The linearly polarized light forms astrip facula, which is staggered between light and dark in the vertical direction and linearly translates along with the rotation of the polarization plane. The strip sub-wavelength aluminum metal polarization grating can be used for measurement of angle of rotation of the linearly polarized light.

Description

technical field [0001] The invention relates to the technical field of applied optics, in particular to a strip-shaped sub-wavelength aluminum metal polarization grating applied in the range of visible light and near-infrared. Background technique [0002] In the polarized light detection technology, the polarizing device can be used as a polarizer to generate polarized light, and can also be used as an analyzer to detect the polarization state of the output light, which is an indispensable and important device. Polarizers are divided into the following types according to different manufacturing methods: reflective type, birefringent type, dichroic type, scattering type and sub-wavelength metal grating type. Among them, the sub-wavelength metal grating has the characteristics of small size, large light-passing area, compact structure, good polarization performance, and easy integration. It is an ideal method for making polarizing devices and has been extensively studied by d...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B5/18
CPCG02B5/1866G02B5/3058
Inventor 徐启峰
Owner LONGYAN UNIV
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