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Achromatic optical zoom system based on double-layer medium metasurface

An optical zoom and metasurface technology, which is applied in the field of achromatic optical zoom system, can solve problems such as small zoom range, limited design practicability and application scenarios, and increased work space, so as to achieve multiplexing of convergence and divergence, and large-scale Optical zoom capability, the effect of improving image quality

Active Publication Date: 2022-05-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, a material that can be stretched is used as the base of the metasurface. By stretching the metasurface to change the pitch of the phase modulation, more than twice the optical zoom can be obtained. However, the stretching of the base will increase the working space. , and the mechanical mechanism used to stretch the base increases the complexity of the system and has a certain impact on integration
Or use electrostatic drive to zoom by changing the distance between the two metasurfaces. However, this zoom range is small and can only achieve a zoom effect of less than 2 times.
In addition, the use of rectangular metasurfaces is not compatible with the existence of more circular clear apertures in traditional optical devices; the complex mechanical structure required for lateral movement also leads to a decrease in integration
[0004] The most important thing is that the various metasurface-based zoom optical systems mentioned above can only work under the condition of a single wavelength, and all have corresponding defects, which greatly limit the practicability and application scenarios of the design

Method used

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  • Achromatic optical zoom system based on double-layer medium metasurface
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  • Achromatic optical zoom system based on double-layer medium metasurface

Examples

Experimental program
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Effect test

Embodiment 1

[0095] Such as Figure 4 and Figure 5 As shown, the focusing behavior of the incident light is simulated with the FDTD algorithm, and the wavelengths of the linearly polarized visible light incident light are set to 440nm, 540nm and 640nm.

[0096] In embodiment 1, the silicon dioxide substrate width L of the phase control unit is 300nm, the height H of the titanium dioxide dielectric column is 900nm, and the cross-sectional parameters of the dielectric column include: the diameter of the cylindrical dielectric column is 40-260nm; The diameter is 40-260nm, the diameter of the inner ring is 0-220nm; the outer diameter of the concentric ring dielectric column is 240nm, the diameter of the middle circle is 40-200nm, and the diameter of the inner circle is 0-160nm; the side length of the square dielectric column 40-260nm; the outer square side length of the square hole dielectric column is 240nm, and the inner square hole side length is 40-200nm; the length and width of the cros...

Embodiment 2

[0110] Such as Figure 9 , Figure 10As shown, the difference from Embodiment 1 is that in this embodiment, the wavelengths of the incident light are set at 1310 nm, 1430 nm and 1550 nm, and the near-infrared incident light is a linearly polarized plane wave. The width L of the silica substrate of the phase control unit is 1000nm, the height H of the silicon dielectric column is 1600nm, and the cross-sectional parameters of the dielectric column include: the diameter of the cylindrical dielectric column is 80-800nm; the outer diameter of the ring dielectric column is 80-800nm , the diameter of the inner ring is 0-720nm; the diameter of the outer circle of the concentric ring dielectric column is 800nm, the diameter of the middle circle is 80-720nm, and the diameter of the inner circle is 0-640nm; the side length of the square dielectric column is 80-800nm; The outer square side length of the square hole dielectric column is 800nm, and the inner square hole side length is 80-7...

Embodiment 3

[0122] Such as Figure 14 , Figure 15 As shown, the difference from Embodiment 1 is that in this embodiment, the wavelengths of the long-wave infrared incident light are set to 8um, 9um and 10um, and the long-wave infrared incident light is a linearly polarized plane wave. The width L of the germanium base of the phase control unit is 4um, the height H of the germanium dielectric column is 12um, and the cross-sectional parameters of the dielectric column include: the diameter of the cylindrical dielectric column is 0.6-3.4um; the outer diameter of the ring dielectric column is 0.6-3.4um , the diameter of the inner ring is 0-2.8um; the diameter of the outer circle of the concentric ring medium column is 3.2um, the diameter of the middle circle is 0.6-2.6um, and the diameter of the inner circle is 0-2um; the side length of the square medium column is 0.6 -3.4um; the outer square side length of the square hole dielectric column is 3.2um, and the inner square hole side length is...

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Abstract

The invention discloses an achromatic optical zoom system based on a double-layer medium metasurface, and belongs to the technical field of optical devices. Comprising a first-layer dielectric metasurface and a second-layer dielectric metasurface, and the first-layer dielectric metasurface and the second-layer dielectric metasurface are arranged in parallel. The first-layer dielectric metasurface and the second-layer dielectric metasurface are formed by splicing a plurality of phase regulation and control units, and the first-layer dielectric metasurface and the second-layer dielectric metasurface formed by the plurality of phase regulation and control units respectively have opposite spiral phases; wide-spectrum incident light passes through the spiral phase of the first layer of dielectric metasurface and the spiral phase of the second layer of dielectric metasurface to be subjected to wavefront phase modulation at the same time, and then an output synthetic phase is a spherical lens phase, so that output light with different wavelengths is focused at the same focus. According to the invention, chromatic aberration-free zooming of wide-spectrum incident light can be realized, the requirement of an extra working space is avoided, and the integration level and the imaging quality are high.

Description

technical field [0001] The invention belongs to the technical field of optical devices, and more specifically relates to an achromatic optical zoom system based on a double-layer dielectric metasurface. Background technique [0002] Achromatic optical zoom systems are widely used in the field of optical imaging. At present, in the field of optics, it mainly relies on the use of lens groups to produce focusing effects. Zooming is achieved by changing the distance between the lenses in the lens group. Conducive to integration, additional components are required to correct chromatic aberration, and the system is more complex. [0003] With the development of metasurfaces, there are new opportunities for improvement in aspects such as the integration of optical zoom systems. In the prior art, a material that can be stretched is used as the base of the metasurface. By stretching the metasurface to change the pitch of the phase modulation, more than twice the optical zoom can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/04G02B26/06G02B1/00
CPCG02B15/04G02B26/06G02B1/002
Inventor 杨振宇冯兴赵茗
Owner HUAZHONG UNIV OF SCI & TECH
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