Ultra-broadband achromaticity of metalens with low-relative phase enabled by wide-band fusion

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION
Zhiheng Wang , Yechuan Zhu , Shun Zhou , Wenhao Guo , Yong Liu , Chen He , Minyu Bai , Weiguo Liu
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Abstract

Metalenses have a high design degree of freedom in controlling the light field and excellent performance in chromatic aberration elimination. However, in designing ultra-broadband achromatic metalenses, integrating multiple types of unit structures is necessary to compensate for phase differences caused by different incident wavelengths. Here, we propose an ultra-broadband achromatic metalens composed only of a single type of square nano-pillar. which controls the entire operating band by utilizing three wide-band fusions, and have characteristics depending on the phase coverage and relative phase. In the operational range of 2–5 μm, the achromatic metalens demonstrates a maximum focal shift of 2.1 μm. The average focal shift is 0.98 %, the average NA value is 0.35, with an average relative phase of 0.77π. The average transmittance and focus efficiency are 94.17 % and 58.7 %, respectively. This broad-spectrum fusion design strategy simplifies manufacturing complexity while maintaining high focusing efficiency and transmittance levels throughout the entire operational bandwidth. This design approach can improve image resolution and quality by minimizing chromatic aberration.

通过宽带融合实现具有低相对相位的金属蛋白的超宽带消色差特性
金属透镜在控制光场方面具有很高的设计自由度,在消除色差方面性能卓越。然而,在设计超宽带消色差金属透镜时,需要集成多种类型的单元结构,以补偿不同入射波长引起的相位差。在此,我们提出了一种仅由单一类型的方形纳米柱组成的超宽带消色差金属透镜,它通过利用三个宽带融合器来控制整个工作波段,并具有取决于相位覆盖和相对相位的特性。在 2-5 μm 的工作范围内,消色差金属膜的最大焦移为 2.1 μm。平均焦距偏移为 0.98%,平均 NA 值为 0.35,平均相对相位为 0.77π。平均透射率和聚焦效率分别为 94.17 % 和 58.7 %。这种宽光谱融合设计策略简化了制造复杂性,同时在整个工作带宽内保持了较高的聚焦效率和透射率水平。这种设计方法可以最大限度地减少色差,从而提高图像分辨率和质量。
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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
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