A pin-like beam is a kind of structured light with a special intensity distribution that can be against diffraction,which can be seen as a kind of quasi-nondiffracting beam(Q-NDB).Due to its wide applications,recently...A pin-like beam is a kind of structured light with a special intensity distribution that can be against diffraction,which can be seen as a kind of quasi-nondiffracting beam(Q-NDB).Due to its wide applications,recently,numerous researchers have used optical lenses or on-chip integrated optical diffractive elements to generate this kind of beam.We theoretically verify and experimentally demonstrate an all-fiber solution to generate a subwavelength inverted pin beam by integrating a simple plasma structure on the fiber end surface.The output beams generated by two kinds of plasma structures,i.e.,nanoring slot and nanopetal structure,are investigated and measured experimentally.The results show that both the structures are capable of generating subwavelength beams,and the beam generated using the nanopetal structure has the sidelobe suppression ability along the x-axis direction.Our all-fiber device can be flexibly inserted into liquid environments such as cell cultures,blood,and biological tissue fluids to illuminate or stimulate biological cells and molecules in them.It provides a promising fiber-integrated solution for exploring light–matter interaction with subwavelength resolution in the field of biological research.展开更多
Dynamic polarization control remains a major challenge in fiber-integrated metasurfaces,with most research focusing on static polarization.Herein,we propose a dynamic polarization metasurface(DP-MS)integrated at the e...Dynamic polarization control remains a major challenge in fiber-integrated metasurfaces,with most research focusing on static polarization.Herein,we propose a dynamic polarization metasurface(DP-MS)integrated at the end of a large-mode fiber.The DP-MS decouples orthogonal polarization states,enabling precise rotation of focal spots in response to changes in the polarization direction of incident quasi-plane waves.Simulations show that the DP-MS can generate single,vortex,and multi-focal spots.By optimizing signal functions,multi-focal spots with precise control over number,position,distance,and synchronized rotation are achieved.This study has potential applications in optical manipulation and beam shaping.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.62205079,62065006,62125503,and 62261160388)the Natural Science Foundation of Hubei Province of China (Grant No.2023AFA028)+1 种基金the Innovation Project of GUET Graduate Education (Grant No.2023YCXS214)the Innovation Project of Optics Valley Laboratory (Grant No.OVL2021BG004).
文摘A pin-like beam is a kind of structured light with a special intensity distribution that can be against diffraction,which can be seen as a kind of quasi-nondiffracting beam(Q-NDB).Due to its wide applications,recently,numerous researchers have used optical lenses or on-chip integrated optical diffractive elements to generate this kind of beam.We theoretically verify and experimentally demonstrate an all-fiber solution to generate a subwavelength inverted pin beam by integrating a simple plasma structure on the fiber end surface.The output beams generated by two kinds of plasma structures,i.e.,nanoring slot and nanopetal structure,are investigated and measured experimentally.The results show that both the structures are capable of generating subwavelength beams,and the beam generated using the nanopetal structure has the sidelobe suppression ability along the x-axis direction.Our all-fiber device can be flexibly inserted into liquid environments such as cell cultures,blood,and biological tissue fluids to illuminate or stimulate biological cells and molecules in them.It provides a promising fiber-integrated solution for exploring light–matter interaction with subwavelength resolution in the field of biological research.
基金supported by the National Natural Science Foundation of China(Nos.12164010 and 62175044)the Guangxi Project(No.2022GXNSFFA035031)the Innovation Project of GUET Graduate Education(Nos.2023YCXB13 and 2023YCXS218)。
文摘Dynamic polarization control remains a major challenge in fiber-integrated metasurfaces,with most research focusing on static polarization.Herein,we propose a dynamic polarization metasurface(DP-MS)integrated at the end of a large-mode fiber.The DP-MS decouples orthogonal polarization states,enabling precise rotation of focal spots in response to changes in the polarization direction of incident quasi-plane waves.Simulations show that the DP-MS can generate single,vortex,and multi-focal spots.By optimizing signal functions,multi-focal spots with precise control over number,position,distance,and synchronized rotation are achieved.This study has potential applications in optical manipulation and beam shaping.
