基于阶梯折射率分布的声学超透镜及其制备方法
By employing a stepped refractive index distribution design in the acoustic superlens, the problems of high manufacturing difficulty and high cost of acoustic superlenses are solved, achieving stable operation near the cutoff frequency and reducing the requirements for processing accuracy and manufacturing costs.
CN122416979APending Publication Date: 2026-07-17CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
- Filing Date
- 2026-06-17
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
The structural design of existing acoustic metalenses is limited by subwavelength conditions, resulting in manufacturing difficulties, high costs, and uncontrollable errors.
Method used
An acoustic superlens design based on a stepped refractive index distribution is adopted. By setting periodic units with different equivalent refractive indices at different locations, the scatterer operates near the cutoff frequency by utilizing the size variation of the scatterer, thereby reducing the requirements for processing accuracy.
Benefits of technology
It achieves effective operation near the cutoff frequency, reduces manufacturing costs and manufacturing errors, while maintaining the stability and consistency of the sound field control function.
✦ Generated by Eureka AI based on patent content.
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Figure CN122416979A_ABST
Abstract
本发明涉及声学超材料、声学超透镜及声场调控领域，尤其涉及一种基于阶梯折射率分布的声学超透镜及其制备方法，声学超透镜包括支撑基底和周期单元，周期单元固定在支撑基底上并呈周期性排布，每个周期单元均包括散射体和环绕在散射体周围的背景介质，散射体与背景介质的声学性能不同；沿声学超透镜长度方向不同位置处的周期单元具有不同的等效折射率，每个周期单元的等效折射率与声学超透镜在该位置处的目标折射率相匹配，且由散射体的尺寸确定。本发明通过使周期单元工作于截止频率附近，利用等效折射率对周期单元尺寸的低灵敏度，允许采用较大尺寸的周期单元，进而突破传统亚波长条件的限制，降低对加工精度的要求，减少制造成本与制造误差。
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