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Double-layer dielectric metasurface-based optical zooming system

An optical zoom and metasurface technology, which is applied in the field of optical zoom systems, can solve problems such as small zoom range, high complexity of metasurface optical zoom systems, and additional requirements for workspaces, and achieve high structural utilization and excellent optical zoom capabilities , the effect of small length

Active Publication Date: 2019-08-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects of the prior art, the purpose of the present invention is to solve the technical problems of the existing metasurface optical zoom system, such as the high complexity, the small zoom range, the need to move the zoom horizontally and have additional requirements for the work space, etc.

Method used

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Examples

Experimental program
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Embodiment 1

[0090] Figure 4 It is the top view of the structure of the first layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided by embodiment 1; Figure 5 It is the top view of the structure of the second-layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in embodiment 1; the focusing behavior of incident light is simulated with the FDTD algorithm, and the wavelength of the incident light is set to be 254nm. Light is a linearly polarized plane wave.

[0091] In Example 1, the width L of the alumina substrate of the basic unit is 100 nm, the height H of the aluminum nitride dielectric column is 250 nm, and the diameter of the cylindrical dielectric column is 10-100 nm.

[0092] Firstly, the control of the phase and amplitude of the incident light by the cylindrical dielectric column is investigated. Use the finite difference time domain method (FDTD) to carry out simulation experiment...

Embodiment 2

[0103] Figure 7 It is a top view of the structure of the first layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in embodiment 2; Figure 8 It is the top view of the structure of the second-layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in embodiment 2; the focusing behavior of incident light is simulated with the FDTD algorithm, and the wavelength of the incident light is set to be 532nm. Light is a linearly polarized plane wave.

[0104] In Example 1, the width L of the silicon dioxide substrate of the basic unit is 350 nm, the height H of the silicon nitride dielectric column is 700 nm, and the diameter of the cylindrical dielectric column is 40-320 nm.

[0105] Firstly, the control of the phase and amplitude of the incident light by the cylindrical dielectric column is investigated. Use the finite difference time domain method (FDTD) to carry out simulation exper...

Embodiment 3

[0116] Figure 10It is the top view of the structure of the first layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided by embodiment 3; Figure 11 It is the top view of the structure of the second-layer metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in embodiment 3; the focusing behavior of incident light is simulated with the FDTD algorithm, and the wavelength of the incident light is set to be 1550nm. Light is a linearly polarized plane wave.

[0117] In Example 3, the width L of the silicon dioxide base of the basic unit is 600 nm, the height H of the silicon nitride dielectric column is 700 nm, and the diameter of the cylindrical dielectric column is 80-520 nm.

[0118] Firstly, the control of the phase and amplitude of the incident light by the cylindrical dielectric column is investigated. Use the finite difference time domain method (FDTD) to carry out simulation experi...

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Abstract

The invention discloses a double-layer dielectric metasurface-based optical zooming system. The system comprises a first layer of dielectric metasurface and a second layer of dielectric metasurface, wherein both the two layers of dielectric metasurface are formed by a plurality of basic units through splicing; each basic unit comprises a base plate and a cylindrical dielectric column arranged on the base plate; a mapping relationship exists among the diameters of the cylindrical dielectric columns of each layer of dielectric metasurface, the distances from the cylindrical dielectric columns tothe centers of the dielectric metasurface and the angles between the cylindrical dielectric columns and the dielectric metasurface; incident light is incident to pass through the two layers of dielectric metasurface in sequence; the two layers of dielectric metasurface carry out phase modulation on the incident light in sequence for two times, so as to realize a focusing effect for the incident light; and when the relative rotation angles of the first layer of dielectric metasurface and the second layer of dielectric metasurface change relative to an initial state, focusing focal lengths corresponding to the two layers of dielectric metasurface are changed, and the focusing effect of the two layers of dielectric metasurface for the incident light is changed. The zooming system provided bythe invention is capable of realizing zooming according to the sizes of the rotation angles and realizing large-scale zooming.

Description

technical field [0001] The invention relates to the technical field of optical devices, and more specifically, to an optical zoom system based on a double-layer dielectric metasurface. Background technique [0002] 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, and by changing the distance between the lenses in the lens group, zooming is achieved. At present, the main zoom system is a linear lens group zoom system, that is, the focusing and zooming operations are performed on a straight line in the direction of the incident light. Such as SLR camera lens and so on. This type of zoom system usually needs to occupy a large space, and at the same time requires a very large working space, which is not conducive to integration. The relatively new periscope zoom system changes the direction of the incident light first, so that complex lens groups ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/00G02B5/00
CPCG02B5/00G02B26/00
Inventor 魏云轩杨振宇赵茗胡满琛
Owner HUAZHONG UNIV OF SCI & TECH
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