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Spiral metal wire grating circuit polarizer

A metal wire grid, circular polarizer technology, applied in polarizing elements and other directions, can solve the problems of large size of helical metal wire grid, limited optical characteristics, inapplicability, etc., and achieve the effect of compact structure, easy integration and small device size

Inactive Publication Date: 2011-05-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The device they proposed is a single helix structure, and the material is gold. The signal-to-noise ratio of this single helix structure device can only reach about 10dB; and because the proposed helical metal wire grid is too large, the material gold used is The optical properties in the visible light and near-infrared range are limited, and the working wavelength range is in the infrared band of 3-6 microns, which cannot be applied to the visible light and near-infrared band at all.

Method used

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  • Spiral metal wire grating circuit polarizer
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  • Spiral metal wire grating circuit polarizer

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: 10 are deposited on the quartz glass substrate 1 6 A uniformly distributed helical aluminum metal wire grid 2, each metal wire grid is 3 intertwined spiral wire grids, the diameter SD of the spiral wire grid is 30 nanometers, the number of helical helical periods CN equals 3, and the helical period spacing CS is 200 nanometers, the helix diameter CD is 100 nanometers, and the aluminum metal wire grid spacing CW is 190 nanometers;

[0032] In Fig. 4(a), the curve depicted by the hollow rectangular frame is the transmittance of right-handed circularly polarized light, the curve depicted by the hollow triangular frame is the transmittance of left-handed circularly polarized light, and the curve depicted by the black solid frame is the extinction ratio; Fig. 4 The curve in (b) is the signal-to-noise ratio. In this embodiment, the average signal-to-noise ratio, working wavelength range, average transmittance, and average extinction ratio are 41.0 dB, 0.47-1.05...

Embodiment 2

[0033] Embodiment 2: 10 are deposited on the quartz glass substrate 1 6 A uniformly distributed multi-helical aluminum metal wire grid 2, each metal wire grid is 4 spiral wire grids intertwined with each other, the diameter SD of the spiral wire grid is 30 nanometers, the number of helical helical periods CN equals 3, and the helical period The spacing CS is 200 nanometers, the spiral diameter CD is 100 nanometers, and the aluminum metal wire grid spacing CW is 190 nanometers;

[0034] In Fig. 5(a), the curve depicted by the hollow rectangular frame is the transmittance of right-handed circularly polarized light, the curve depicted by the hollow triangular frame is the transmittance of left-handed circularly polarized light, and the curve depicted by the black solid frame is the extinction ratio; Fig. 5 The curve in (b) is the signal-to-noise ratio. In this embodiment, the average signal-to-noise ratio, working wavelength range, average transmittance, and average extinction r...

Embodiment 3

[0035] Embodiment 3: 10 are deposited on the quartz glass substrate 1 6 A uniformly distributed multi-helical aluminum metal wire grid 2, each metal wire grid is 3 intertwined spiral wire grids, the diameter SD of the spiral wire grid is 20 nanometers, the number of helical helical periods CN of the helical shape is equal to 3, and the helical period The spacing CS is 200 nanometers, the spiral diameter CD is 100 nanometers, and the aluminum metal wire grid spacing CW is 190 nanometers;

[0036] In Fig. 6 (a), the curve depicted by the hollow rectangular frame is the transmittance of right-handed circularly polarized light, the curve depicted by the hollow triangular frame is the transmittance of left-handed circularly polarized light, and the curve depicted by the black solid frame is the extinction ratio; Fig. 6 The curve in (b) is the signal-to-noise ratio. In this embodiment, the average signal-to-noise ratio, working wavelength range, average transmittance, and average e...

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Abstract

The invention relates to a spiral metal wire grating circuit polarizer which belongs to the field of optical devices and aims at enabling the spiral metal wire grating circuit polarizer to have higher signal-to-noise ratio in visible light and near-infrared wave bands; furthermore, the device has small size, compact structure and easiness in integration. N spiral aluminum metal wire gratings which are distributed uniformly are deposited on a quartz glass substrate, the aluminum metal wire gratings are M spiral wire gratings which are intertwined mutually, initial points of all the spiral wire gratings on the substrate are distributed on the same circumference at equal intervals, and the spiral directions are the same; the diameter of each spiral wire grating is 20-30nm, the number of spiralization cycles is 3, and the spacing interval of the spiralization cycles is 200nm, the diameter of a spiral is 100nm, and the spacing interval of the aluminum metal wire gratings is 190nm, M is not less than 3, and N is not les than 106. The signal-to-noise ratio of the spiral metal wire grating circuit polarizer can achieve 37.7dB, the operating wavelength range can achieve 0.49-1.34 mu m, the polarization extinction ratio is greater than 270: 1, the polarized light transmittance is greater than 67%, and the spiral metal wire grating circuit polarizer is applicable to polarization beam splitting, display, laser and the like.

Description

technical field [0001] The invention belongs to optical devices, in particular to a spiral metal wire grid circular polarizer. Background technique [0002] Circular polarizer is an important polarizing component in the field of optics. It has been widely used in polarization splitting, color display, laser technology and other fields. At present, in the field of optics, it is common practice to use two separate components, a linear polarizer and a quarter-wave plate, to form a circular polarizer. The angle is passed through a quarter-wave plate, and circularly polarized light is finally obtained. The disadvantages of this structure are very obvious: 1. The working wavelength range is narrow, mainly because the working wavelength range of the quarter-wave plate is narrow, so this structure cannot obtain circularly polarized light with a wide wavelength range; 2. The structure Two separate optical components are used, so the device size is large and not easy to integrate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
Inventor 杨振宇陆培祥赵茗
Owner HUAZHONG UNIV OF SCI & TECH
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