Optical Focusing beyond the Diffraction Limit via Vortex-Assisted Transient Microlenses,ACS Photonics

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Optical Focusing beyond the Diffraction Limit via Vortex-Assisted Transient Microlenses
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-19 , DOI: 10.1021/acsphotonics.0c00109
Eitan Edrei ₁ , Giuliano Scarcelli ₁

Affiliation

Focusing light beyond the diffraction limit is among the greatest challenges in optical sciences, which would revolutionize many optical technologies from imaging and optical trapping to light delivery and photomedicine. To achieve subdiffraction focusing, metamaterials, materials with engineered scattering properties, or attached microspheres have been proposed. Here we introduce a new paradigm to achieve a physical focus beyond the diffraction limit without additional optical elements or exogenous labels, but only using light–matter interactions. We spatially control light absorption within the focal region of a lens to generate a transient heat source and sculpt a semiparabolic refractive index pattern within the sample itself. This effectively generates a converging microlens with a focusing spot below the diffraction limit of the optical system that can be used for super-resolution imaging by scanning the spot across the sample. Our method is broadly compatible with imaging and focusing systems used in many applications.

中文翻译：

通过涡旋辅助瞬态微透镜使光学聚焦超出衍射极限

将光聚焦到衍射极限之外是光学科学领域的最大挑战之一，这将彻底改变从成像和光阱到光传输和光医学的许多光学技术。为了实现亚衍射聚焦，已经提出了超材料，具有工程散射特性的材料或附着的微球。在这里，我们介绍了一种新的范例，可以实现超出衍射极限的物理焦点，而无需使用其他光学元件或外源标记，而仅使用光-物质相互作用。我们在空间上控制透镜焦点区域内的光吸收，以产生瞬态热源，并在样品本身内雕刻半抛物线折射率图案。这样可以有效地生成聚焦点低于光学系统衍射极限的会聚微透镜，该微透镜可通过在整个样品上扫描光斑来用于超分辨率成像。我们的方法与许多应用中使用的成像和聚焦系统广泛兼容。

更新日期：2020-04-23

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