Dynamic Airy imaging through high_efficiency broadband phase microelements by femtosecond laser direct writing  

作　　者：ZE CAI XINBO QI DENG PAN SHENGYUN JI JINCHENG NI ZHAOXIN LAO CHEN XIN JIAWEN LI YANLEI HU DONG Wu JIARU CHI 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei 230027,China

出　　处：《Photonics Research》2020年第6期875-883,共9页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(51675503,51805508,51805509,51875544,61475149,61805230);Fundamental Research Funds for the Central Universities(WK2090090012,WK2090090021,WK2480000002,WK6030000103);Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017495);National Key Research and Development Program of China(2018YFB1105400).

摘　　要：Manipulating Airy beams to symmetric Airy beams(SABs)with abruptly autofocusing and self accelerating properties has attracted much attention.With such a particular propagation dynamic,SABs may provide great potential in dynamic signal imaging.On the other hand,the generation of SABs by spatial light modulators suffers from the limitations of phase gradient accuracy,low optical efficiency(<40%),and a bulky footprint.Therefore,exploring imaging applications and optimal generation methods of these Airy-type beams deserves further research.Here,based on the coordinate transformation of SAB,an asymmetric Airy beam(AAB)is realized.Symmetric/asymmetric cubic phase microplates(SCPPs/ACPPs)are designed and fabricated for generating SAB/AAB.The SCPP/ACPP demonstrates superior performance:compact construction(60μm × 60μm × 1.1μm),continuous variation of phase,high efficiency(~81%at 532 nm),and broadband operation from 405 to 780 nm.Dynamic imaging under monochromatic and polychromatic lights is realized by the SAB/AAB,indicating various results at different propagation distances with a certain initial signal.Further investigation reveals that the SCPP on a soft substrate maintains its physical dimensions and optical properties unchanged during stretching.Our work enables wide potential applications in integrated optics,beam manipulation,and imaging.

关 键 词：PHASE unchanged STRETCHING 

分 类 号：TN249[电子电信—物理电子学]