Use of Dielectric Metasurfaces to Generate Deep‐Subwavelength Nondiffractive Bessel‐Like Beams with Arbitrary Trajectories and Ultralarge Deflection,Laser & Photonics Reviews

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Use of Dielectric Metasurfaces to Generate Deep‐Subwavelength Nondiffractive Bessel‐Like Beams with Arbitrary Trajectories and Ultralarge Deflection
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-03-08 , DOI: 10.1002/lpor.202000487
Jing Wen ₁ , Lei Chen ₁ , Xu Chen ₁ , Saima Kanwal ₁ , Leihong Zhang ₁ , Songlin Zhuang ₁ , Dawei Zhang ₁ , Dangyuan Lei ₂

Affiliation

For decades, accelerating beams have attracted considerable interest in fundamental physics and in various emerging applications. However, not only are conventional accelerating beam generators (such as spatial light modulators) bulky and diffraction‐inefficient, they also have a poorly resolved ability of phase manipulation that limits the accelerating beam's minimum size and maximum degree of curvature. In this study, a dielectric metasurface is used to generate highly focused nondiffractive Bessel‐like accelerating beams with predefined arbitrary trajectories within a broadband spectral range of 550–710 nm. In particular, a similar metasurface with a combined phase profile allows the generation of a Bessel‐like vortex beam with an ultrahigh numerical aperture of 0.79, resulting in a subwavelength beamwidth of 234 nm (≈0.43λ) down to the diffraction limit. In addition, various accelerating Bessel‐like beams and beam arrays with different predefined trajectories and characteristic beam parameters that are not otherwise achievable with conventional spatial light modulators are demonstrated with synthetic‐phase metasurfaces. This study promotes the diversity of Bessel‐like accelerating beams for practical applications in fields such as optical manipulation, optical storage, biomedical imaging, and material processing.

中文翻译：

使用介电超表面来产生具有任意轨迹和超大挠度的深亚波长非衍射贝塞尔样光束

几十年来，加速光束引起了人们对基础物理学和各种新兴应用的极大兴趣。但是，不仅传统的加速光束发生器（例如空间光调制器）体积庞大且衍射效率低下，而且它们的相位处理能力也差强人意，从而限制了加速光束的最小尺寸和最大曲率。在这项研究中，电介质超表面被用来产生高度聚焦的无衍射贝塞尔样加速光束，并在550-710 nm的宽带光谱范围内具有预定的任意轨迹。尤其是，具有组合相位轮廓的类似超颖表面可以生成具有0.79的超高数值孔径的贝塞尔状涡旋光束，从而产生234 nm（≈0.43）的亚波长光束宽度。λ）降至衍射极限。此外，在合成相位超表面上还展示了各种加速的贝塞尔光束和具有不同预定义轨迹和特征光束参数的光束阵列，而传统的空间光调制器则无法实现这些特征。这项研究促进了像贝塞尔一样的加速光束的多样性，可用于光学操纵，光学存储，生物医学成像和材料加工等领域的实际应用。

更新日期：2021-05-07

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