A multispectral phase metasurface device

A metasurface and phase-type technology, applied in the field of metamaterials, can solve problems such as complex optical systems, and achieve the effect of simple and compact structure, favorable processing and light weight

Active Publication Date: 2018-01-09
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical system of the traditional STED fluorescence scanning microscope is very complicated, and there is an urgent need to use a single optical element to generate two required spots.
However, in STED microscopy systems, the focal length of traditional metasurface lenses is wavelength-dependent, which has an adverse effect on multispectral imaging.

Method used

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  • A multispectral phase metasurface device
  • A multispectral phase metasurface device
  • A multispectral phase metasurface device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 of the present invention takes the preferred elliptical nanopore unit structure as an example, such as figure 1 As shown, the multi-spectral phase metasurface device includes a substrate 1, a metasurface layer 2, and nanopores 3 etched in the metasurface layer arranged in sequence from bottom to top. Wherein the thickness of the substrate is h; the thickness of the supersurface layer is d; the total thickness of the material is t; the characteristic size w (short axis) of the nanopore structure is not equal to l (long axis). According to this structure, its design principle will be described in detail below.

[0038] Under the incidence of circularly polarized light CPL, each nanopore acts as a polarizing filter, so the spatially varying array of holes produces spatially varying polarization states. Polarization state changes are related to phase changes due to photon spin-orbit interactions. The transmitted light will produce a phase delay of 2σα, where ...

Embodiment 2

[0055] Focusing and imaging of different wavelengths at the same position is realized by using a multi-spectral phase metasurface device. According to the above design theory, assuming that there are several point light sources with different wavelengths at the same position, their phase distribution on the metasurface can be expressed as:

[0056]

[0057] For simplicity, it is assumed that the amplitudes of these sources are equal. In the process of processing and designing the metasurface, this embodiment uses three different wavelengths of 532nm, 632.8nm and 785nm. The circular sample radius is designed to be 10 μm, and the focal length is f=9 μm. Figure 10 is the SEM image of the sample, in which the nanopore arrays are arranged according to C6 symmetry. The metasurface was simulated and tested under the incident conditions of three different wavelengths. Figure 11 The left column is the numerical calculation results of the xoz plane intensity under the incident c...

Embodiment 3

[0060] The multi-spectral phase-type metasurface device is used to realize the focusing of light waves with different wavelengths and different angles incident at the same position. Different from Embodiment 2, in this embodiment, light waves incident at different angles are used to focus at the same position, and the phase distribution of the corresponding metasurface can be expressed as:

[0061]

[0062] where kxn and kyn are the transverse wave vectors of the nth inclined incident electromagnetic wave in the x and y directions. In this embodiment, it is assumed that the amplitudes of these light sources are equal, and three different wavelengths of 532nm, 632.8nm and 785nm are used, and the corresponding incident angles are 0°, 30° and -30° (the incident planes are all xoz planes), and the focal length is 50 μm , with an aperture of 100 μm. See the result Figure 13 ,in, Figure 13 (a) is a wavelength of 532nm, an incident angle of 0 ° light intensity distribution di...

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Abstract

The invention discloses a multi-spectral phase-type metasurface device and belongs to the metamaterial technical field. The multi-spectral phase-type metasurface device of the invention is composed of a nano unit structure array which is formed on ultra-thin metal or a medium through etching. According to the multi-spectral phase-type metasurface device of the invention, multi-frequency information is coded onto a metasurface; and phase regulation can be performed on electromagnetic waves of a plurality of wavelengths by using wide-band spin-orbit interaction of nanostructures on the metasurface, so that the electromagnetic waves with different wavelengths and different incident angles can be focused to a specific shape. Therefore, the multi-spectral phase-type metasurface device of the invention can be applied to the design of a multi-wavelength ultra-small optical device and an integrated optical system.

Description

technical field [0001] The invention relates to the technical field of metamaterials, in particular to a multispectral phase metasurface device. Background technique [0002] In modern electromagnetics, independent control of electromagnetic waves in different frequency bands is crucial in applications such as wireless communication and multispectral imaging. However, the existence of material dispersion limits the development of conventional technologies, making the corresponding devices and systems bulky, bulky and performance-limited. [0003] As a two-dimensional metamaterial, metasurfaces have been proven to be able to fully control the amplitude, phase, and polarization state of electromagnetic waves. Using the laws of reflection and refraction in the case of metasurfaces, the wavefront can be modulated arbitrarily. Many functions such as beam steering, focusing and imaging are thus possible. Since metasurfaces are thinner and easier to process than metamaterials, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G02B5/00
CPCG02B1/002G02B5/00
Inventor 罗先刚赵泽宇王彦钦李雄马晓亮蒲明博
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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