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Precise optical ranging method based on zero-refractive-index metamaterials

A zero-refractive index, precision optics technology, applied in optics, optical components, measuring devices, etc., can solve the problems of complex optical path construction and operation process, affecting popularization and application, and achieve simplified optical path design and operation steps, simple measurement methods, The effect of accurate phase change information

Active Publication Date: 2019-04-16
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optical path construction and operation process of this method are relatively complicated, which affects its popularization and application.

Method used

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  • Precise optical ranging method based on zero-refractive-index metamaterials
  • Precise optical ranging method based on zero-refractive-index metamaterials
  • Precise optical ranging method based on zero-refractive-index metamaterials

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Experimental program
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Effect test

Embodiment 1

[0045] When the incident light frequency of the light source 1 is TM polarized light with a frequency of 14.483 GHz, corresponding to a spatial wavelength of 2.07 cm, a two-dimensional square lattice structure photonic crystal is selected as the zero-refractive-index metamaterial 4 . Let the lattice constant of the photonic crystal be a, by Al 2 o 3 Dielectric pillars (dielectric constant ε=10) are periodically arranged in a square lattice structure in an air background (ε=1), and the radius of the dielectric pillars is 0.213a. When the period size of the photonic crystal array is 11.74mm, the radius of the ceramic pillars is r=2.5mm, forming a rectangular array of 15a×10a, the normalized frequency ω of the two-dimensional square lattice structure photonic crystal at the Dirac point D =0.567, corresponding to the effective refractive index n when the incident frequency is 14.483GHz eff =0.

[0046] according to figure 1 As shown, the optical ranging system is assembled. T...

Embodiment 2

[0048] The difference between this embodiment and Embodiment 1 is that a two-dimensional triangular lattice structure photonic crystal is selected as the zero-refractive-index metamaterial 4 . If the lattice constant of the photonic crystal is a, by Al 2 o 3 Dielectric pillars (dielectric constant ε=10) are periodically arranged in the air in a triangular lattice structure, and the radius of the dielectric pillars is 0.196a. When the photonic crystal array period size is 12.77mm, Al 2 o 3 The radius of the ceramic column r = 2.5mm, consisting of The rectangular array of this two-dimensional triangular lattice structure photonic crystal is normalized at the Dirac point frequency ω D =0.617, corresponding to the effective refractive index n when the incident frequency is 14.483GHz eff =0.

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 is that the incident light frequency of the light source 1 is TM polarized light of 16.2 GHz, which has a wavelength of 1.85 cm in vacuum, and a two-dimensional square lattice structure photonic crystal is selected as the zero-refractive index metamaterial 4. Alumina dielectric pillars (dielectric constant ε=12.5) are periodically arranged in the air in a square lattice structure, and the radius of the dielectric pillars is 2mm. When the period size of the photonic crystal array is 1cm, forming a rectangular array of 15a×10a, the normalized frequency ω of the photonic crystal with the two-dimensional square lattice structure at the Dirac point D =0.541, corresponding to the effective refractive index n when the incident frequency is 16.2GHz eff =0.

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Abstract

The invention provides a zero refractive index meta-material based precision optics ranging method. A reflection face is fixed on a to-be-detected face. Incident light passes through the zero refractive index meta-material and propagates a distance D in a free space and is then reflected by the reflection face back to the zero refractive index meta-material. In the zero refractive index meta-material, the incident light and reflected light overlap with each other. The displacement of the to-be-detected face is lambda / 4 every change from the darkest to the brightest of the light intensity of synthesis wave. The continuous displace Delta D=N lambda / 4 of the to-be-detected face can be measured accurately according to the light intensity change frequency N of the synthesis wave. By mounting the planar reflection mirror unit on the exit face and the to-be-detected face, the system measurement precision can be improved further and the displacement resolution rate reaches lambda / (4M). The method is simple in operation and accurate in measurement. The displacement resolution is smaller than the resolution lambda / 2 of a traditional interference type ranging method. Accurate measurement of phase shift can be realized in light frequency. The resolution reaches Pi / (2M). The method is suitable for a full-wave band range including a radio wave band and an optical wave band.

Description

technical field [0001] The invention relates to a precise optical ranging method based on a zero-refractive-index metamaterial, and belongs to the technical field of optical ranging. Background technique [0002] Laser is often used as a light source for optical distance measurement due to its strong directivity, high brightness, monochromaticity, coherence and other advantages. Laser ranging is a comprehensive application of multidisciplinary technologies such as optics, laser technology, precision machinery, electronics, microelectronics, and optoelectronics, and is developing in the direction of digitization, automation, low cost, and miniaturization. Laser ranging has a series of advantages such as high measurement accuracy, high resolution, strong anti-interference ability, small size, and light weight, and plays an important role in military affairs, science and technology, and engineering. [0003] At present, optical ranging technology is mainly divided into four me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/46G02B1/00
CPCG01S17/46G02B1/002
Inventor 董国艳李振飞
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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