Method for achieving wavefront modulation based on dielectric conformal metasurface

A technology of wavefront modulation and realization method, applied in the field of micro-nano optics and holography

Active Publication Date: 2019-01-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite the fruitful results in the design of planar metasurfaces, few researchers have

Method used

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  • Method for achieving wavefront modulation based on dielectric conformal metasurface
  • Method for achieving wavefront modulation based on dielectric conformal metasurface
  • Method for achieving wavefront modulation based on dielectric conformal metasurface

Examples

Experimental program
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Embodiment 1

[0045] Example 1: Lens Focusing Based on Dielectric Conformal Metasurface

[0046] The method for realizing lens focusing based on the medium conformal metasurface disclosed in this embodiment, the specific implementation steps are as follows:

[0047] Step 1: Design the geometric dimensions of the nanocolumn unit so that the round nanocolumn can arbitrarily adjust the phase of the outgoing beam under the light irradiation of a specific working wavelength (633nm). The specific implementation method is as follows:

[0048] The method based on finite-difference time-domain FDTD scans the radius r (40nm-140nm) and height h (200nm-800nm) of the simulated nanocolumn under the condition that the period P is fixed. For a specific working wavelength of 633nm, the dielectric materials and substrates used in the simulation are titanium dioxide and silicon dioxide, respectively, and their refractive indices are 2.5836 and 1.45, respectively, when the imaginary part of the refractive inde...

Embodiment 2

[0055] Example 2: Realizing adjustable anomalous refraction on curved surface based on medium conformal metasurface

[0056] The specific implementation steps of the method for adjusting anomalous refraction based on medium conformal metasurface surface disclosed in this embodiment are as follows:

[0057] Step 1: Use the same method in Example 1 to scan the radius and height of a single circular nanopillar, so that the amplitude is close to 1 and the phase covers 0-2π.

[0058] Step 2: Calculate the phase of curved surface and metasurface. The calculation of the phase of the surface, using the FDTD method to simulate the phase distribution of the outgoing light According to formula (2), the phase distribution for achieving anomalous refraction can be calculated In this case, the phase distribution produced by the conformal metasurface is the phase distribution that achieves anomalous refraction with the actual surface The difference in the phase distribution of . S...

Embodiment 3

[0060] Example 3: Curved Surface Stealth Based on Dielectric Conformal Metasurface

[0061] The method for realizing curved surface stealth based on medium conformal metasurface disclosed in this embodiment, the specific implementation steps are as follows:

[0062] Step 1: Use the same method in Example 1 to scan the radius and height of a single circular nanopillar, so that the amplitude is close to 1 and the phase covers 0-2π.

[0063] Step 2: Calculate the phase of curved surface and metasurface. When the incident light passes through any curved substrate, the phase distribution of the outgoing light can be calculated using the FDTD method Due to the realization of the stealth function of the curved surface, the wavefront of the outgoing light is consistent with the incident light, such as Figure 5 (a), so the phase value should be constant. Therefore, the phase distribution of the metasurface can be obtained

[0064] Step 3: Metasurface phase encoding. A 2D parabol...

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Abstract

The invention discloses a method for achieving wavefront modulation based on a dielectric conformal metasurface, and belongs to the technical field of micro-nano optics and holography. The implementation method comprises the following steps of designing a unit structure of the metasurface, wherein the metasurface is composed of dielectric circular nanopillar arrays with different geometric sizes,and by changing the geometric radius and height of a nanopillar unit, the phase of an emergent light beam is randomly adjusted and controlled by the metasurface; when a single curved surface is considered only, calculating out phase distribution phi 0 of incident light passing the curved surface according to a ray tracing method or a finite-different time-domain (FDTD) method, and then calculatingout phase distribution phi d of user-customized functions according to a diffraction theory or a holographic principle analysis method, thereby compensating a phase difference phi p of the two by using the dielectric conformal metasurface; and carrying out coding on the phase of the metasurface. The user-customized functions include lens focusing, adjustable abnormal refraction, optical camouflage and illusion functions. According to the method, the corresponding technical problems in the field of wearable electronic products, medical equipment or photoelectric devices can be solved.

Description

technical field [0001] The invention relates to an optical modulation method, in particular to a method for modulating the wavefront of an arbitrary curved surface object based on a medium conformal metasurface to realize the optical characteristics of user-customized functions, and belongs to the field of micro-nano optics and holography. The optical properties of the user-customizable functions include lens focus, adjustable anomalous refraction, cloaking and phantom. Background technique [0002] Metasurfaces, a new subcategory of 2D metamaterials, consist of periodic, quasi-periodic, or randomly distributed subwavelength metal / dielectric antennas that can locally modify the amplitude, phase, and polarization of electromagnetic waves. Compared with conventional optical devices (such as spatial light modulators and diffractive optical elements), the modulation of the wavefront by metasurfaces does not depend on the phase accumulation of the propagation path. Metasurfaces ...

Claims

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Application Information

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IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 黄玲玲王涌天韩娜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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