CN-121995556-A - Large-view-field multi-wavelength achromatic double-plate cascading super-constructed lens device and design method and application thereof

CN121995556ACN 121995556 ACN121995556 ACN 121995556ACN-121995556-A

Abstract

The invention belongs to the technical field of micro-nano optics, and particularly relates to a large-view-field multi-wavelength achromatic double-plate cascading super-constructed lens device, and a design method and application thereof. The device comprises two cascade super-structure lenses which are sequentially arranged along an object plane to an image plane, wherein the two cascade super-structure lenses are composed of achromatic super-structure atoms which are periodically arranged, incident light can be cooperatively regulated and controlled, and aberration correction is realized while focusing is performed. The device can adapt to multiple wavelengths or specific single wavelengths by optimizing the phase distribution of the two tandem super-structured lenses and the distance between them and selecting the adapted achromatic super-structured atoms. The design method of the device comprises the steps of determining device parameters according to requirements, optimizing the phase distribution of two cascade super-structure lenses and the distance between the two cascade super-structure lenses, and finally selecting adaptive achromatic super-structure atoms to finish the design. The device is suitable for multiple wavelengths or specific single wavelengths, has the effects of large visual field and high image quality, and can be applied to the fields of imaging modules, near-eye display, laser beam shaping, laser radar and the like.

Inventors

ZHANG CHENG
LIU ZEYANG
AN XIANGRUI
SHEN LU
ZHU ZHAOYU
HU YUHUI
LIU HAO
ZHENG DEQIAN

Assignees

华中科技大学

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (10)

1. The utility model provides a big field of view multi-wavelength achromatic biplate concatenation super-structure lens device which characterized in that includes along object plane to image plane arrange in proper order first piece super-structure lens and second piece super-structure lens, two super-structure lenses cooperate each other, realize aberration correction when focusing.
2. A method of designing a large field multi-wavelength achromatic two-piece tandem super lens device according to claim 1, comprising the steps of: S1, determining working wavelength of the super-structure lens device, field angle of an image plane and image facing angle line length according to target requirements; S2, taking a view angle, a working wavelength, an effective focal length, an image plane size, a system total length and the diameter of the super-structure lens as constraint indexes, taking imaging quality as an evaluation index, taking the phase distribution of the two super-structure lenses and the distance between the two super-structure lenses as optimization variables, and gradually optimizing the phase distribution of the two super-structure lenses under the corresponding working wavelength to obtain target phase distribution, wherein the system total length is the distance from the first super-structure lens to the image plane; S3, selecting materials and shapes of the super-structure atoms meeting achromatic requirements, constructing a super-structure atom library according to the corresponding relation between the super-structure atom structure parameters and the phase values, and then determining the super-structure atom structure parameters of each super-structure lens according to the target phase distribution and the transmittance of the super-structure atoms; S4, quantitatively evaluating achromatism performance and energy utilization performance of the double-plate cascading super-structure lens system through the values of the focus offset and the efficiency so as to optimize the super-structure atomic structure parameters.
3. The method of designing a large field multi-wavelength achromatic two-piece tandem super-lens device according to claim 2, wherein in step S2, the phase distribution is optimized according to the following phase distribution formula: Wherein, the Is the total number of terms of the polynomial, For the order of the number of steps, Is the first A step phase coefficient; is the distance from a certain point on the surface of the super-structure lens to the center; is the normalized radius.
4. The method for designing a large-field multi-wavelength achromatic double-plate cascade super-structure lens device according to claim 3, wherein in step S3, matching conditions between phases corresponding to super-structure atomic structural parameters and target phases and transmittance of super-structure atoms are quantitatively evaluated by an evaluation function shown as follows: Wherein, the Is the super-structured lens An evaluation function of the individual super-structure atoms, For the total number of operating wavelengths, Is the first Super-structured lens at each working wavelength The target phase values of the individual super-constituent atoms, Is the first Super-structured lens at each working wavelength The actual phase values of the individual super-constituent atoms, Is the first Super-structured lens at each working wavelength The transmittance of each super-structure atom, Is the first The weight of the individual operating wavelengths is determined, For the total number of all the superconstituent atoms on the superconstituent lens, Changing the weights of different working wavelengths according to design requirements to realize more targeted selection of the super-structure atomic structure parameters; Evaluation function The smaller the number of the super-structure atoms, the more accurate the phase corresponding to the selected super-structure atom structure parameter is matched with the target phase, and the higher the transmittance of the super-structure atoms, the more meets the design requirement, and the selection is carried out from the super-structure atom structure library during the design A set of structural parameters of the super-structure atom with the smallest numerical value.
5. The method of designing a multi-wavelength achromatic two-piece tandem super-structure lens device according to claim 4, wherein in step S4, achromatic performance and energy utilization performance of the two-piece tandem super-structure lens device are evaluated by focus offset and efficiency, respectively, and if the focus offset or efficiency does not meet the design requirement, one or more of the following three optimization operations are performed, and the iteration is looped until the focus offset and efficiency meet the design requirement: (1) Re-optimizing the target phase distribution by adjusting the phase coefficient in the phase distribution formula of the double-plate cascading super-constructed lens and optimizing the phase distribution which meets the requirements of achromatic performance and energy utilization performance; (2) Expanding a super-structure atom structure library, namely expanding or reconstructing a structure parameter space of the super-structure atom, including but not limited to adjusting the shape, the material and the size of the super-structure atom to expand the range of the phase value and the transmittance which can be realized by the super-structure atom; (3) Re-selecting the super-structure atoms, namely adjusting the weight of each working wavelength in the evaluation function based on the updated phase distribution or the extended super-structure atom structure library, and re-selecting the structural parameters of the super-structure atoms; The calculation formula of the focus offset is as follows: Wherein, the Is the first At the respective working wavelength The focus offset of the individual fields of view, Is the first At the respective working wavelength Focal length of the individual fields of view, To refer to the focal length of the field of view at the operating wavelength, The average value of the focus offset of the full field of view at the full operating wavelength, For the total number of operating wavelengths, Sampling the total number of view field angles; The calculation formula of the efficiency is as follows: Wherein, the Is the first At the respective working wavelength The efficiency of the individual fields of view, which can be calculated by dividing the energy in the effective area of the focused spot by the total energy incident on the two-piece tandem super-structured lens, Is the average value of the full field of view efficiency of the full operating wavelength, For the total number of operating wavelengths, The total number of samples is the field angle.
6. The method for designing a large field multi-wavelength achromatic double tandem super-lens device according to claim 2, wherein in step S2, the phase distribution is a phase distribution calculated by a Binary 2 surface type; The imaging quality evaluation indexes comprise root mean square radius of a point chart, point spread function, modulation transfer function, field curvature and distortion.
7. The method of designing a large field multi-wavelength achromatic two-piece tandem super-structure lens device according to claim 2, wherein said first and second pieces of super-structure lenses each include a substrate and super-structure atoms distributed on the substrate; The super-structure atom structure parameters comprise the material, shape and size of the super-structure atom.
8. The method of designing a large field multi-wavelength achromatic double tandem super-structure lens device according to claim 7, wherein said super-structure atoms are isotropic super-structure atoms or anisotropic super-structure atoms of a C4 symmetric structure, wherein said isotropic super-structure atoms include one or more of a cylinder, a square column, a hollow circular column, a hollow regular square prism, a cross column, and boolean operations of these patterns; Wherein the super-structure lens device has polarization independent working characteristics when the isotropic super-structure atoms of the C4 symmetrical structure are adopted to construct the super-structure lens device, and has polarization multiplexing or polarization selection working characteristics when the anisotropic super-structure atoms are adopted to construct the super-structure lens device.
9. The method for designing a large field multi-wavelength achromatic double tandem super-lens device according to claim 2, wherein in step S1, the working wavelength is a complex color light wavelength or a single color light wavelength.
10. Use of a large field multi-wavelength achromatic double tandem super lens device according to claim 1 for imaging, display, beam collimation or focusing.

Description

Large-view-field multi-wavelength achromatic double-plate cascading super-constructed lens device and design method and application thereof Technical Field The invention belongs to the technical field of micro-nano optics and optical imaging, and particularly relates to a large-view-field multi-wavelength achromatic double-plate cascading super-constructed lens device, a design method and application thereof. Background In the fields of imaging, display, laser shaping, precision measurement and the like, an optical lens module is widely used as a core element for realizing beam control. With the development of miniaturization and integration of optical systems, the demands for small-sized, large-field-of-view and high-image-quality lens modules are increasing. The conventional optical lens module generally comprises a spherical lens, an aspherical lens, a reflecting mirror, a free-form surface and other components. However, they are limited by their physical mechanisms, large volume and weight, limited light field modulation capability, aberrations, and inability to provide both good imaging quality and high degree of light weight as conventional optical devices. Therefore, the conventional optical lens module is difficult to meet the requirements of small size, large field of view and high image quality, and development of a novel optical element is needed to solve the above problems. The super-structured lens is a novel plane optical element which is raised in recent years and consists of sub-wavelength structural units. Compared with the traditional refractive lens which gradually accumulates phases through light propagation in a medium, the super-structure lens can control multidimensional physical quantities (including amplitude, phase, polarization state and the like) of electromagnetic waves in a customized mode by means of interaction of light waves and sub-wavelength structural units, and further the rich and flexible light field regulation and control functions are achieved. The thickness of the super-structure lens is far smaller than that of the traditional refractive lens, and compared with the traditional lens, the super-structure lens has the advantages of light weight, flexible design, strong regulation and control capability, easiness in integration and the like. However, the current super-structured lens is subject to the degree of freedom of regulation and control, and has the problems of serious chromatic aberration and smaller imaging field of view. The above problems also restrict their application in imaging, display, beam shaping, etc. Therefore, how to overcome the limitation of the super-structured lens in chromatic aberration and imaging field of view is a key problem to be solved in order to promote the wide application. Disclosure of Invention The invention aims to provide a large-view-field multi-wavelength achromatic double-plate cascading super-structured lens device, a design method and application thereof, and the multi-wavelength color imaging with large view field and high image quality can be realized by cooperatively regulating and controlling incident light through two super-structured lenses. In order to achieve the above object, the first aspect of the present invention provides a large-field multi-wavelength achromatic double-plate cascading super-structure lens device, which comprises a first plate super-structure lens and a second plate super-structure lens sequentially arranged along an object plane to an image plane, wherein the two plate super-structure lenses are mutually matched, and aberration correction is achieved while focusing. The invention provides a design method of a large-view-field multi-wavelength achromatic double-plate cascading super-constructed lens device, which is characterized by comprising the following steps of: S1, determining working wavelength of the super-structure lens device, field angle of an image plane and image facing angle line length according to target requirements; s2, taking a view angle, a working wavelength, an effective focal length, an image plane size, a system total length and the diameter of the super-structure lens as constraint indexes, taking imaging quality as an evaluation index, taking the phase distribution of the two super-structure lenses and the distance between the two super-structure lenses as optimization variables, and gradually optimizing the phase distribution of the two super-structure lenses under the corresponding working wavelength to obtain target phase distribution, wherein the system total length is the distance from the first super-structure lens to the image plane; S3, selecting materials and shapes of the super-structure atoms meeting achromatic requirements, constructing a super-structure atom library according to the corresponding relation between the super-structure atom structure parameters and the phase values, and then determining the super-structure atom structure parameters of each s