An optical zoom system based on double-layer dielectric metasurface

An optical zoom and metasurface technology, applied in the field of optical zoom systems, can solve the problems of high complexity of metasurface optical zoom systems, additional requirements for work space, small zoom range, etc., and achieve excellent optical zoom capabilities, small length, and structure The effect of high utilization

Active Publication Date: 2020-09-08
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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  • An optical zoom system based on double-layer dielectric metasurface
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  • An optical zoom system based on double-layer dielectric metasurface

Examples

Experimental program
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Effect test

Embodiment 1

[0091] Figure 4 It is a top view of the structure of the first layer of the super-surface of the optical zoom system based on the double-layer medium super-surface provided in Embodiment 1; Figure 5 It is the top view of the structure of the second metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in Example 1. The focusing behavior of the incident light is simulated by the FDTD algorithm, and the wavelength of the incident light is set to 254nm. The light is a linearly polarized plane wave.

[0092] In Embodiment 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.

[0093] First, the regulation of the phase and amplitude of the incident light by the cylindrical dielectric cylinder is investigated. Use the finite difference time domain method (FDTD) for simulation experiments, set the ...

Embodiment 2

[0104] Figure 7 It is a top view of the structure of the first layer of the super-surface of the optical zoom system based on the double-layer medium super-surface provided in Embodiment 2; Figure 8 It is the top view of the structure of the second metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in Example 2. The focusing behavior of the incident light is simulated by the FDTD algorithm, and the wavelength of the incident light is set to 532nm. The light is a linearly polarized plane wave.

[0105] In Embodiment 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.

[0106] First, the regulation of the phase and amplitude of the incident light by the cylindrical dielectric cylinder is investigated. Use the finite difference time domain method (FDTD) for simulation experiments, s...

Embodiment 3

[0117] Picture 10 It is a top view of the structure of the first layer of the supersurface of the optical zoom system based on the double-layer medium supersurface provided in Embodiment 3; Picture 11 It is the top view of the structure of the second metasurface of the optical zoom system based on the double-layer dielectric metasurface provided in Example 3. The focusing behavior of the incident light is simulated by the FDTD algorithm, and the wavelength of the incident light is set to 1550nm. The light is a linearly polarized plane wave.

[0118] In Embodiment 3, the width L of the silicon dioxide substrate 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.

[0119] First, the regulation of the phase and amplitude of the incident light by the cylindrical dielectric cylinder is investigated. Use the finite difference time domain method (FDTD) to carry out the simulatio...

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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 present invention relates to the technical field of optical devices, and more specifically, to an optical zoom system based on a double-layer medium supersurface. Background technique [0002] The optical zoom system is 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 a focusing effect, and zooming is achieved by changing the distance between the lenses in the lens group. The current main zoom system is a linear lens group zoom system, that is, focusing and zooming are performed on a straight line in the direction of incident light. Such as SLR camera lens. This type of zoom system usually needs to take up a large space, and at the same time, the demand for working space is also very large, which is not conducive to integration. The newer periscope zoom system first changes the direction of the incident light, so that a complex lens group can be placed in another di...

Claims

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Application Information

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Patent Type & Authority Patents(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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