Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Achromatic metalens design method and achromatic metalens thereof

A design method and achromatic technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of unsatisfactory effects of meta-lenses, unsatisfactory effects, and reduced area, so as to reduce the number of scans and design time, Reasonable design and easy production

Active Publication Date: 2019-05-24
SUN YAT SEN UNIV
View PDF9 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing metalenses often only act on specific wavelengths, and the effects in bands other than specific wavelengths are often unsatisfactory; if it is necessary to achieve achromatic focusing of a wide spectral band on a single-layer metalens, its area Limited by the formula R_max NAΔω≤2cΔΦ, the area is greatly reduced (where R_max is the lens radius, NA is the numerical aperture, Δω is the spectral width, c is the speed of light in vacuum, and ΔΦ is the phase dispersion interval)
In addition, most metalenses are polarization-dependent, which has strict requirements on the incident light and is easily affected by stray light of different polarization states.
The above limitations lead to the unsatisfactory effect of metalenses in practical applications

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Achromatic metalens design method and achromatic metalens thereof
  • Achromatic metalens design method and achromatic metalens thereof
  • Achromatic metalens design method and achromatic metalens thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A design method of an achromatic meta-lens, as shown in Figure 1-2, takes an achromatic meta-lens with three layers of the first nano-unit 2, the second nano-unit 4 and the third nano-unit 6 as an example, The degrees of freedom of the first nano-unit 2, the second nano-unit 4 and the third nano-unit 6 are respectively three, and the total degree of freedom of the three-layer superposition is nine, including the following steps:

[0041] S1 determines the total degrees of freedom of the individual nano-units 2, 4, and 6, and sets the required incident light band, and then sets the range and interval of the geometric parameters of each degree of freedom. The geometric parameters of each degree of freedom of , 4 and 6 are simulated and scanned to obtain the phase shift and transmittance of the incident light band produced by a single nano-unit 2, 4, and 6 under different combinations of geometric parameters;

[0042] S2 changes the wavelength band of the incident light, a...

Embodiment 2

[0050] An achromatic metal lens, such as figure 2 , 4 , 5, the achromatic meta-lens design method described in Embodiment 1 is adopted, including a substrate 1 and a multi-layer nano-unit 2, 4, and 6 that are arranged on one side of the substrate 1 and are stacked and combined. Units 2, 4, and 6 are of sub-wavelength size, and the multilayered nano-units 2, 4, and 6 are stacked and combined according to the Fresnel hyperbolic law: Arrange, where x, y are the coordinates of each nano-unit, is the phase shift of the nano-unit, λ is the target wavelength, n is the refractive index of the material background, f is the design focal length, and C(λ) is the initial phase constant.

[0051] like figure 2 , 4 As shown in , 5, taking a three-layer superimposed achromatic metalens as an example, the first nano-unit 2 and the second nano-unit 4 are monocrystalline silicon cylindrical nano-units, and the third nano-unit 6 is a silicon nitride cylindrical nano-unit unit. Wherein, an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of optical lenses, particularly to an achromatic metalens design method and an achromatic metalens thereof. The achromatic metalens design method comprisesperforming analog scanning on every degree of freedom geometrical parameter of every single nano unit through a numerical simulation method, performing numerical adding on phase shift produced by nano units with different geometrical parameter combinations, performing numerical multiplication on transmittance to acquire the total phase shift and the total transmittance of superposed multilayer nano units, performing superposition combination on the nano units with appropriate units, and arranging the superposed nano units according to the corresponding Fresnel hyperbolic-type laws corresponding to every target wavelength to obtain the achromatic metalens. By performing parameter design, superposition combination and arrangement on the nano units forming the achromatic metalens, the achromatic metalens can act on multiple target wavelengths and eliminate the influence of color difference brought about by traditional lenses, and the area of the achromatic metalens can be increase to thecentimeter scale or above.

Description

technical field [0001] The invention relates to the technical field of optical lenses, and more particularly, to a design method of an achromatic meta-lens and an achromatic meta-lens thereof. Background technique [0002] Metasurfaces are artificially fabricated materials with subwavelength thicknesses that modulate electromagnetic waves mainly through photonic resonance. Their properties are based on the ability to control the phase and polarization of light using subwavelength-scale dielectrics or metallic nanoresonators. Correspondingly, metasurfaces can change the properties of each phase, polarization, and intensity of transmitted or reflected light beams, and realize various extraordinary optical phenomena such as deflection, retroreflection, polarization conversion, focusing, and beam shaping. Focusing anamorphic surfaces, commonly referred to as metalenses, whose subwavelength nanostructures can provide more precise and efficient phase control than binary amplitude...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02B27/00G02B1/00
Inventor 梁浩文冯伟彬李俊韬孙茜刘志浩
Owner SUN YAT SEN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com