基于自旋去耦的多焦点宽带太赫兹编码超透镜。

IF 3.3 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2025-09-08 DOI:10.1364/OE.573062
Hengli Feng, Hongyan Meng, Daqiang Cong, Jia Liu, Shuang Yang, Wenqiang Shi, Yachen Gao
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引用次数: 0

摘要

利用人工亚波长结构阵列构建的超表面已经成功地实现了对电磁波前的精确操纵。尽管如此,精确控制具有不同自旋状态的电磁波仍然是一个挑战。为了解决这一问题,基于新的自旋解耦原理,我们提出了两种具有多焦点的创新超透镜。具体而言,第一种超构透镜在0.6太赫兹线性极化波下可以产生四个均匀强度的焦点。当被左圆极化(LCP)或右圆极化(RCP)波照射时,它可以形成两个围绕中心对称分布的焦点。对于第二个超透镜,当LP波入射时,它产生三个弱焦点和一个强焦点。当LCP波入射时,超透镜只产生一个强焦点。当RCP波入射时,它们产生三个较弱的焦点。这两种超构透镜的聚焦强度和聚焦区域都可以通过调制入射波的椭圆度来灵活调节。此外,它们能够在0.55至0.7太赫兹的宽带宽范围内实现自旋解耦的多焦点。该技术可以同时控制正交自旋态电磁波和精确调节空间能量分布,从而为多功能设备的设计和集成提供新的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spin decoupling-based broadband terahertz encoded metalens with multi-focal points.

Metasurfaces constructed using artificial sub-wavelength structure arrays have successfully acheived precise manipulation of electromagnetic wavefronts. Despite this, the precise control of electromagnetic waves with different spin-states remains a challenge. To address this, based on the new principle of spin-decoupling, we proposed two innovative metalenses with multiple focal points. Specifically, the first metalens can generate four foci with uniform intensity under 0.6 THz linearly polarized (LP) waves. When illuminated by left (LCP) or right circularly polarized (RCP) waves, it can form two foci that are symmetrically distributed about the center. For the second metalens, when LP waves are incident, it produces three weak foci and one strong focal point. When LCP waves are incident, the metalens generates only one strong focal point. When RCP waves are incident, they produce three weaker foci. The foci intensity and focal region for both types of metalens can be flexibly adjusted by modulating the ellipticity of the incident wave. In addition, they are capable of achieving spin-decoupled multi-focal points within a wide bandwidth range of 0.55 to 0.7 THz. This technology enables simultaneous control of orthogonal spin-state electromagnetic waves and precise regulation of spatial energy distribution, thereby offering new possibilities for the design and integration of multifunctional devices.

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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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