基于贝塞尔光束的复合光场调控超衍射聚焦

Super-Diffraction Focusing Based on Bessel Beam Controlled by Composited Light Field

新型光场调控技术已经在焦场调控、光学微加工、光学微操纵和光通信等领域取得了众多重要成果。提出了一种基于贝塞尔光束的复合光场调控方案,利用贝塞尔光束固有角谱和环形光阑的锐边衍射实现了远距离的超衍射极限聚焦。理论和实验结果表明,轴棱锥透镜系统生成的局域空心光束经环形光阑产生锐边衍射,其高频成份得到增强,从而具有超衍射聚焦特性。该局域聚焦光场与周围旁瓣光场距离很远,有望应用于远场超分辨显微成像和光镊等领域。

In the disciplines of focal field modulation,optical micromachining,optical micromanipulation,and optical communication,the new optical field modulation technology has made significant achievements.In this study,we propose a composite light field modulation scheme based on the Bessel beam that realizes a distant superdiffraction limiting focus using the Bessel beam’s intrinsic angle spectrum and the annular aperture’s sharp edge diffraction.The theoretical and experimental results reveal that the bottle beam formed using the axiconlens system has a focusing property and that the highfrequency components can be enhanced using the annular aperture’s sharp edge diffraction,resulting in superdiffraction properties bottle beam.The local focused light field is separated from the surrounding side lobe light field and is expected to be applied in farfield superresolution microscopic imaging and optical tweezers.