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Splitter for high-polarization polarized light beam in visual light band

A technology of beam splitter and degree of polarization, which is applied in polarizing components, optics, instruments, etc., can solve problems such as difficult to obtain performance polarization beam splitter, narrow working frequency band of polarizer, poor degree of polarization, etc.

Inactive Publication Date: 2002-12-04
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But the main disadvantage of this method is that the incident angle must be Brewster's angle, and the Brewster's angle is different for different wavelengths
Therefore, strictly speaking, the light effect is only good for one wavelength, and if it deviates from Brewster's angle, the degree of polarization will be poor
[0009] In summary, traditional polarizers have defects such as narrow operating frequency band, difficulty in obtaining high polarization degree and transmittance at the same time, and strong dependence on materials. In particular, it is difficult to obtain wide-band high Polarizing Beam Splitters for Degree of Polarization

Method used

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  • Splitter for high-polarization polarized light beam in visual light band
  • Splitter for high-polarization polarized light beam in visual light band
  • Splitter for high-polarization polarized light beam in visual light band

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Embodiment Construction

[0022] The specific preparation of the metal photonic crystal polarization beam splitter designed by the present invention is as follows:

[0023] Electron beam etching is used to form such as figure 1 For the two-dimensional array groove shown, a metal layer is coated on the array groove by a conventional coating method, and after stripping with photoresist, only the metal layer in the groove is left, and then a layer of SiO is formed by a coating method. 2 film layer (this material has a small refractive index), and then use electron beam etching to form a groove, and then form a metal layer in the groove, so that it can be formed alternately many times. figure 2 Metal rods shown with SiO embedded between 2 The ratio of the radius of the metal rod to the lattice constant is R / a=0.219±0.01, where the lattice constant a=0.127 μm.

[0024] In the present invention we take the homogeneous medium as SiO 2 , and approximately take its permittivity ε b is 1, and the dielectric...

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Abstract

The invention discloses the separator of polarization light beam with high degree of polarization in the visible light wave band by using the metal photon crystal structure. The medium sticks in two dimensions array structure are formed on the substrate. The said two dimensions array structure can be square lattice or hexagonal lattice. The said medium stick is made from metal material. SiO2 is inserted between medium sticks. The structure of polarimeter is different from the traditional polarimeter. Changing the ratio of R / a between the radius of the metal stick and the lattice constant can design the working wave band in advance and obtain high degree of polarization and transmission rate.

Description

technical field [0001] The invention relates to a polarizer, in particular to a polarized beam splitter with a high polarization degree in the visible light band using a metal photonic crystal structure. Background technique [0002] Polarizing beam splitter is a kind of polarizer under the condition of incidence angle of 45°. Traditional polarizers generally have the following three types: [0003] 1. Birefringent polarizer [0004] The most typical such as Nicol prism is made according to the principle of birefringence. When a light beam is incident from air to the surface plane of a transparent, anisotropic uniaxial or biaxial crystal, the light will form two refracted beams in the bulk crystal, namely o-ray and e-ray, which are separated from each other in space Therefore, two kinds of polarized light emitted in different directions can be obtained. Their disadvantage is that if the incident angle of the light incident on the end face of the prism is within the "quali...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/01
Inventor 陆卫周梅陈效双李志锋李宁王少伟
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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