Vortex-field enhancement through high-threshold geometric metasurface

扫码查看

原文链接

维普
万方数据

外文摘要：Intense vortex beam is expected to empower captivating phenomena and applications in high power laser-matter interac-tions.Currently,the superposition of multiple vortex beams has shown the unique ability to tailor and enhance the vortex field.However,traditional strategies to generate such beams suffer from large volume or/and low laser-induced damage threshold,hindering the practical widespread applications.Herein,a single high-threshold metasurface is proposed and experimentally demonstrated for the generation and superposition of multiple collinear vortex beams.This scheme takes advantage of the high conversion efficiency of phase-only modulation in the metasurface design by adopting the concept of a sliced phase pattern in the azimuthal direction.An optical hot spot with an enhanced intensity and steady spatial propagation is experimentally achieved.Moreover,femtosecond laser-induced birefringent nanostructures embedded in silica glass are utilized as the building block with high optical efficiency.Transmittance greater than 99.4%in the near-in-frared range and laser-induced damage threshold as high as 68.0 J/cm2(at 1064 nm,6 ns)are experimentally verified.Considering these remarkable performances,the demonstrated high-threshold metasurface has promising applications in a host of high-power laser fields.

外文关键词：

multiple vortex beamsmetasurfacehigh-thresholdbirefringent nanostructuresfemtosecond laser

作者：

Qingsong Wang、Yao Fang、Yu Meng、Han Hao、Xiong Li、Mingbo Pu、Xiaoliang Ma、Xiangang Luo

展开 >

作者单位：

National Key Laboratory of Optical Field Manipulation Science and Technology,Chinese Academy of Sciences,Chengdu 610209,China

State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering,Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China

College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China

Research Center on Vector Optical Fields,Institute of Optics and Electronics,Chinese Academ

展开 >

出版年：

2024

DOI：

10.29026/oea.2024.240112

光电进展(英文版)

ISSN：

年,卷(期)：2024.7(12)