The mode splitting phenomenon in a high-quality whispering gallery mode(WGM)microresonator coupled to sub-wavelength scatterers can help resolve nanoparticle information.In this study,we analyzed the characteristics o...The mode splitting phenomenon in a high-quality whispering gallery mode(WGM)microresonator coupled to sub-wavelength scatterers can help resolve nanoparticle information.In this study,we analyzed the characteristics of nanoparticle-coupling-induced mode splitting,particularly in multiple-particle insertions relevant to practical biochemical sensing applications.The surface nanoscale axial photonics(SNAP)microresonator supports axial mode field distribution.We fabricated a fiber probe and used it to scan along the longitudinal axis of the SNAP microresonator,sequentially adjusting the axial mode to doublets,confirming the regulatability of mode splitting.The sensing region of the SNAP microresonator was immersed in particle-aqueous environments,and we observed mode splitting induced by particle scattering coupling.By analyzing splitting events,information such as particle binding number,average polarizability,and particle size can be resolved.The SNAP microresonator not only avoids interference from the detection environment on the coupling region through spatial separation between the coupling region and the sensing region,but also enables precise nanoparticle calculation based on splitting spectra,significantly enhancing the practicality of WGM microresonators in biochemical sensing applications.展开更多
A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two sing...A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two single-mode fibers(SMFs).The structure was proven to be an excellent high temperature sensor with good stability,repeatability,and high temperature sensitivity(48.2 pm/C)after annealing process at a high temperature lasting some hours,and a wide working temperature range(from room temperature to 1000 C).In addition,the simple fabrication process and the low cost offered a great potential for sensing in high temperature environments.展开更多
Spatial confinement is a simple and cost-effective method for enhancing signal intensity and improving the detection sensitivity of laser-induced breakdown spectroscopy(LIBS).However,the spatial confinement effects of...Spatial confinement is a simple and cost-effective method for enhancing signal intensity and improving the detection sensitivity of laser-induced breakdown spectroscopy(LIBS).However,the spatial confinement effects of LIBS under different pressures remains a question to be studied,because the pressure of the ambient gas has a significant influence on the temporal and spatial evolution of plasma.In this study,spatial confinement effects of LIBS under a series of reduced air pressures were investigated experimentally,and the plasma characteristics under different air pressures were studied.The results show that the reduced air pressure can lead to both earlier onset and weakening of the enhancement effect of the spatial confinement on the LIBS line intensity.When the air pressure drops to 0.1 kPa,the enhancement effect of the emission intensity no longer comes from the compression of the reflected shock wave on the plasma,but from the cavity’s restriction of the plasma expansion space.In conclusion,the enhancement effect of spatial confinement technology on the LIBS is still effective when the pressure is reduced,which further expands the research and application field of spatial confinement technology.展开更多
基金National Natural Science Foundation of China(62465014,52465065,U24A20315)Natural Science Foundation of Jiangxi Province(20232BCJ23096,20232BAB212016,20232ACB212008,20242BAB25100,20203BBE53038,GJJ2401004).
文摘The mode splitting phenomenon in a high-quality whispering gallery mode(WGM)microresonator coupled to sub-wavelength scatterers can help resolve nanoparticle information.In this study,we analyzed the characteristics of nanoparticle-coupling-induced mode splitting,particularly in multiple-particle insertions relevant to practical biochemical sensing applications.The surface nanoscale axial photonics(SNAP)microresonator supports axial mode field distribution.We fabricated a fiber probe and used it to scan along the longitudinal axis of the SNAP microresonator,sequentially adjusting the axial mode to doublets,confirming the regulatability of mode splitting.The sensing region of the SNAP microresonator was immersed in particle-aqueous environments,and we observed mode splitting induced by particle scattering coupling.By analyzing splitting events,information such as particle binding number,average polarizability,and particle size can be resolved.The SNAP microresonator not only avoids interference from the detection environment on the coupling region through spatial separation between the coupling region and the sensing region,but also enables precise nanoparticle calculation based on splitting spectra,significantly enhancing the practicality of WGM microresonators in biochemical sensing applications.
基金This work was funded by the National Natural Science Foundation of China(NSFC)(Grant Nos.41266001,61665007,and 61865013)National Key Research and Development Project from the Ministry of Science and Technology(Grant No.2018YFE0115700)+1 种基金Science and Technology Project of Jiangxi Education Department(Grant No.GJJ180518)Nanchang Hangkong University graduate student innovation special fund project(Grant No.YC2019053).
文摘A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two single-mode fibers(SMFs).The structure was proven to be an excellent high temperature sensor with good stability,repeatability,and high temperature sensitivity(48.2 pm/C)after annealing process at a high temperature lasting some hours,and a wide working temperature range(from room temperature to 1000 C).In addition,the simple fabrication process and the low cost offered a great potential for sensing in high temperature environments.
基金This research was financially supported by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2018WNLOKF002)the National Natural Science Foundation of China(Grant Nos.12064029 and 61865013)+1 种基金Jiangxi Provincial Natural Science Foundation(No.20202BABL202024)Ph.D.Research Startup Foundation of Nanchang Hangkong University(No.EA201808384).
文摘Spatial confinement is a simple and cost-effective method for enhancing signal intensity and improving the detection sensitivity of laser-induced breakdown spectroscopy(LIBS).However,the spatial confinement effects of LIBS under different pressures remains a question to be studied,because the pressure of the ambient gas has a significant influence on the temporal and spatial evolution of plasma.In this study,spatial confinement effects of LIBS under a series of reduced air pressures were investigated experimentally,and the plasma characteristics under different air pressures were studied.The results show that the reduced air pressure can lead to both earlier onset and weakening of the enhancement effect of the spatial confinement on the LIBS line intensity.When the air pressure drops to 0.1 kPa,the enhancement effect of the emission intensity no longer comes from the compression of the reflected shock wave on the plasma,but from the cavity’s restriction of the plasma expansion space.In conclusion,the enhancement effect of spatial confinement technology on the LIBS is still effective when the pressure is reduced,which further expands the research and application field of spatial confinement technology.
