基于混合相位设计的反射太赫兹超透镜，用于高效离轴聚焦。

IF 3.3 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-10-15 DOI:10.1364/OL.570466

Mohsin Raza, Xiaoman Li, Chenlu Mao, Fenghua Liu, Vassili A Fedotov, Weiping Wu

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引用次数: 0

摘要

提出了一种能够高效离轴贝塞尔光束聚焦的反射型太赫兹超透镜，优化了0.89太赫兹波长，并进行了数值验证。该设计采用了结合锥形和双曲线分量的混合相位剖面，使用基于矢量的公式进行计算，以实现精确的波前控制。模拟证实了稳定的横向约束和超过20 λ的扩展聚焦深度的偏转角度为5°，10°和15°。我们的超透镜在所有情况下都保持70%以上的聚焦效率，验证了设计的稳健性。所提出的方法为太赫兹系统中的离轴聚焦提供了一种紧凑有效的解决方案，具有集成先进成像、光束转向和光谱设备的潜力。

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Reflective terahertz metalens with hybrid phase design for high-efficiency off-axis focusing.

A reflective terahertz metalens, optimized at 0.89 THz, capable of high-efficiency off-axis Bessel beam focusing is proposed and numerically demonstrated. The design utilizes a hybrid phase profile combining conical and hyperbolic components, computed using a vector-based formulation for precise wavefront control. Simulations confirm stable transverse confinement and an extended depth of focus exceeding 20 λ for deflection angles of 5°, 10°, and 15°. Our metalens maintains focusing efficiencies above 70% in all cases, validating the robustness of the design. The proposed approach offers a compact and effective solution for off-axis focusing in terahertz systems, with potential for integration in advanced imaging, beam steering, and spectroscopic devices.

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.