We proposed an approach for the generation of interference-pattern helico-conical beams(HCBs)both theoretically and experimentally.The HCBs exhibiting intricate fringe structures are obtained by exploiting amplitude m...We proposed an approach for the generation of interference-pattern helico-conical beams(HCBs)both theoretically and experimentally.The HCBs exhibiting intricate fringe structures are obtained by exploiting amplitude modulation and interference techniques.To precisely control the optical field distributions,we manipulate the azimuthal term within the helicoconical phase expression,presenting several illustrative cases that highlight the versatility of our approach.Through further combinations,more sophisticated comprehensive HCB patterns are investigated.This study deepens our knowledge about spiral-like optical patterns and paves a new avenue for potential applications,especially in the fields of particle manipulation,nanostructure fabrication,and optical metrology.展开更多
A miniature fiber-coupler-based microfluidic system is proposed for trapping of DNA biomolecules. The loop-shaped fiber-coupler is fabricated by using flame tapering technique and integrated in a microfluidic channel....A miniature fiber-coupler-based microfluidic system is proposed for trapping of DNA biomolecules. The loop-shaped fiber-coupler is fabricated by using flame tapering technique and integrated in a microfluidic channel. Probe-DNA immobilized on the fiber-coupler surface enables specific recognition of target DNA sequences and effectively facilitates the trapping of target DNA molecules. The binding characteristics of biomolecules on the fiber-coupler surface have been theoretically analyzed and experimentally demonstrated. Experimental results indicate that the spectral response of the loop-shaped fiber coupler immobilized with probe DNA exhibits a red-shift with the trapping of the DNA biomolecules. The proposed microfluidic system possesses such desirable merits as simple structure, label-free method and high integration, which make it a promising candidate for applications in molecular biology and related bioengineering areas.展开更多
A Fabry-Perot micro-cavity is fabricated by on-line fiber cutting-welding method.The asymmetrical fiber Fabry-Perot micro-cavity is designed and produced by cutting a standard single-mode fiber and welding the fiber e...A Fabry-Perot micro-cavity is fabricated by on-line fiber cutting-welding method.The asymmetrical fiber Fabry-Perot micro-cavity is designed and produced by cutting a standard single-mode fiber and welding the fiber end with the core-offset structure.The length of the Fabry-Perot micro-cavity could be controlled within a certain range of accuracy based on the on-line fiber cutting-welding method.According to this method,a micro-machined Fabry-Perot micro-cavity with a length of about 147μm is achieved and its spectral characteristic is also investigated in our experiment.This proposed method is suitable to produce a micro-fiber-optic structure with improved and controlled precision,which is attractive for the fiber processing field.Moreover,the fabricated Fabry-Perot micro-cavity also has potential application in the microfluidic system and biochemical detection area.展开更多
基金supported by the National Natural Science Foundation of China(Nos.62231005,62275131,62105164,12374353,and 62305176)the Natural Science Foundation of Tianjin(No.22JCQNJC01540)the Tianjin Development Program for Innovation and Entrepreneurship,and the Fundamental Research Funds for the Central Universities,Nankai University(Nos.63241446,63241330,and 63241331).
文摘We proposed an approach for the generation of interference-pattern helico-conical beams(HCBs)both theoretically and experimentally.The HCBs exhibiting intricate fringe structures are obtained by exploiting amplitude modulation and interference techniques.To precisely control the optical field distributions,we manipulate the azimuthal term within the helicoconical phase expression,presenting several illustrative cases that highlight the versatility of our approach.Through further combinations,more sophisticated comprehensive HCB patterns are investigated.This study deepens our knowledge about spiral-like optical patterns and paves a new avenue for potential applications,especially in the fields of particle manipulation,nanostructure fabrication,and optical metrology.
基金supported by the National Natural Science Foundation of China(Nos.61875091,11804250,11904262,61377095,61201106,11774181,11274182,and 11004110)the Tianjin Natural Science Foundation(No.18JCQNJC71300)+4 种基金the Tianjin Education Commission Scientific Research Project(No.2018KJ146)the 863 National High Technology Program of China(No.2013AA014201)the Sino-Swiss Scientific and Technological Cooperation Project Supported by the Ministry of Science and Technology of China(No.2015DFG32140)the Science&Technology Support Project of Tianjin(No.16YFZCSF00400)the Fundamental Research Funds for the Central Universities
文摘A miniature fiber-coupler-based microfluidic system is proposed for trapping of DNA biomolecules. The loop-shaped fiber-coupler is fabricated by using flame tapering technique and integrated in a microfluidic channel. Probe-DNA immobilized on the fiber-coupler surface enables specific recognition of target DNA sequences and effectively facilitates the trapping of target DNA molecules. The binding characteristics of biomolecules on the fiber-coupler surface have been theoretically analyzed and experimentally demonstrated. Experimental results indicate that the spectral response of the loop-shaped fiber coupler immobilized with probe DNA exhibits a red-shift with the trapping of the DNA biomolecules. The proposed microfluidic system possesses such desirable merits as simple structure, label-free method and high integration, which make it a promising candidate for applications in molecular biology and related bioengineering areas.
基金supported by the National Natural Science Foundation of China(Nos.11804250,11904262,61875091 and 1190418011004110)the Natural Science Foundation of Tianjin(No.18JCQNJC71300)+4 种基金the Tianjin Education Commission Scientific Research Project(Nos.2019KJ016 and 2018KJ146)the 863 National High Technology Program of China(No.2013AA014201)the Sino-Swiss Scientific and Technological Cooperation Project supported by the Ministry of Science and Technology of China(No.2015DFG32140)the Science&Technology Support Project of Tianjin(No.16YFZCSF00400)the Fundamental Research Funds for the Central Universities。
文摘A Fabry-Perot micro-cavity is fabricated by on-line fiber cutting-welding method.The asymmetrical fiber Fabry-Perot micro-cavity is designed and produced by cutting a standard single-mode fiber and welding the fiber end with the core-offset structure.The length of the Fabry-Perot micro-cavity could be controlled within a certain range of accuracy based on the on-line fiber cutting-welding method.According to this method,a micro-machined Fabry-Perot micro-cavity with a length of about 147μm is achieved and its spectral characteristic is also investigated in our experiment.This proposed method is suitable to produce a micro-fiber-optic structure with improved and controlled precision,which is attractive for the fiber processing field.Moreover,the fabricated Fabry-Perot micro-cavity also has potential application in the microfluidic system and biochemical detection area.
