A polarizing beam splitter （PBS） and a non-polarizing beam splitter （NPBS） based on a photonic crystal （PC） directional coupler are demonstrated. The photonic crystal directional coupler consists of a hexagonal ...A polarizing beam splitter （PBS） and a non-polarizing beam splitter （NPBS） based on a photonic crystal （PC） directional coupler are demonstrated. The photonic crystal directional coupler consists of a hexagonal lattice of dielectric pillars in air and has a complete photonic band gap. The photonic band structure and the band gap map are calculated using the plane wave expansion （PWE） method. The splitting properties of the splitter are investigated numerically using the finite difference time domain （FDTD） method.展开更多
光纤具有端面尺寸小且柔韧性好的优势,纤端器件(lab on tip)无需严格的空间准直和耦合光路,具有集成度高、操作灵活、系统稳定等特点.该文详细介绍了基于表面等离激元的全光纤纤端单Airy和双Airy光束设计的基本理论、产生条件及方法.利...光纤具有端面尺寸小且柔韧性好的优势,纤端器件(lab on tip)无需严格的空间准直和耦合光路,具有集成度高、操作灵活、系统稳定等特点.该文详细介绍了基于表面等离激元的全光纤纤端单Airy和双Airy光束设计的基本理论、产生条件及方法.利用聚焦离子束刻蚀技术在纤端金属表面制作缝和槽等微结构,实现了多种Airy光束.紧凑型全光纤纤端集成特种光束发生器件在光捕获、微粒子操纵、光束整形中将具有重要的应用.展开更多
Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave.However,archiving transmissive coding metasurface is still challenging.Here we propose a transmis...Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave.However,archiving transmissive coding metasurface is still challenging.Here we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal polarizations.The polarization beam splitter and the orbital angular momentum(OAM)generator have been studied as typical applications of the anisotropic 2-bit coding metasurface.The simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions,respectively.The anisotropic coding metasurface has been experimentally verified to realize an OAM beam with l=2 of right-handed polarized wave,resulting from both contributions from linear-to-circular polarization conversion and the phase profile modulation.This work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 60577005, and the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No 158110330001.
文摘A polarizing beam splitter （PBS） and a non-polarizing beam splitter （NPBS） based on a photonic crystal （PC） directional coupler are demonstrated. The photonic crystal directional coupler consists of a hexagonal lattice of dielectric pillars in air and has a complete photonic band gap. The photonic band structure and the band gap map are calculated using the plane wave expansion （PWE） method. The splitting properties of the splitter are investigated numerically using the finite difference time domain （FDTD） method.
文摘光纤具有端面尺寸小且柔韧性好的优势,纤端器件(lab on tip)无需严格的空间准直和耦合光路,具有集成度高、操作灵活、系统稳定等特点.该文详细介绍了基于表面等离激元的全光纤纤端单Airy和双Airy光束设计的基本理论、产生条件及方法.利用聚焦离子束刻蚀技术在纤端金属表面制作缝和槽等微结构,实现了多种Airy光束.紧凑型全光纤纤端集成特种光束发生器件在光捕获、微粒子操纵、光束整形中将具有重要的应用.
基金Project supported by the National Natural Science Foundation of China(Grant No.U1931121)the Natural Science Foundation of Heilongjiang Province in China(Grant No.ZD2020F002)+2 种基金111 Project to the Harbin Engineering University(Grant No.B13015)the Fundamental Research Funds for the Central Universities(Grant Nos.3072021CFT2501 and 3072021CF2508)the Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province,China(Grant No.LBH-Q9097).
文摘Coding metasurfaces have attracted tremendous interests due to unique capabilities of manipulating electromagnetic wave.However,archiving transmissive coding metasurface is still challenging.Here we propose a transmissive anisotropic coding metasurface that enables the independent control of two orthogonal polarizations.The polarization beam splitter and the orbital angular momentum(OAM)generator have been studied as typical applications of the anisotropic 2-bit coding metasurface.The simulated far field patterns illustrate that the x and y polarized electromagnetic waves are deflected into two different directions,respectively.The anisotropic coding metasurface has been experimentally verified to realize an OAM beam with l=2 of right-handed polarized wave,resulting from both contributions from linear-to-circular polarization conversion and the phase profile modulation.This work is beneficial to enrich the polarization manipulation field and develop transmissive coding metasurfaces.
