We proposc and numerically investigate the optical transmission behaviors of a subwavelength metal film perforated with a two-dimensional square array of compound circular holes.Enhanced optical transmission is obtain...We proposc and numerically investigate the optical transmission behaviors of a subwavelength metal film perforated with a two-dimensional square array of compound circular holes.Enhanced optical transmission is obtained by using the finite-difference time-domain（FDTD）method,which can be mainly attributed to the excitation and coupling of localized surface plasmon resonances（LSPRs） and surface plasmon polaritons（SPPs）,and Fano Resonances.The redshift of the transmission peak can be achieved by enlarging the size and number of small holes,the environmental dielectric constant.These indicate that the proposed structure has potential applications in integrated optoelectronic devices such as plasmonic filters and sensors.展开更多
Carbon nanotubes(CNTs)hold immense promise for a wide array of applications due to their exceptional physical and chemical properties.Understanding and controlling their structural characteristics,particu-larly the di...Carbon nanotubes(CNTs)hold immense promise for a wide array of applications due to their exceptional physical and chemical properties.Understanding and controlling their structural characteristics,particu-larly the diameter and number of walls,is crucial for harnessing their full potential.We investigated the relationship between these parameters for both commercially available and lab-scale CNTs,spanning a wide range of outer diameters(1-13 nm)and numbers of walls(1-13).Our findings revealed a com-monality among the structural diversity,rather than a random distribution,as evidenced by a piecewise linear relationship between the outer diameter and number of walls,with an inflection point occurring at approximately 4 nm in diameter.This observation is unexpected,as the CNTs were synthesized using different approaches and growth conditions;yet,as a group,they exhibit a“structural scaling”.Addi-tionally,we made an intriguing observation:despite increases in outer diameter and number of walls,the inner diameters remained relatively constant(4-5 nm)for thicker CNTs with more than three walls.These results suggest that structural properties can be estimated based on diameter,which not only ad-vances our fundamental understanding of CNT synthesis but also provides practical insights for tailoring CNT properties for various applications.展开更多
基金supported by National Natural Science Foundation of China(Nos.11464019,11264017,11004088)Young Scientist Development Program of China(No.20142BCB23008)the Natural Science Foundation of Jiangxi Province,China(Nos.2014BAB212001,20112BBE5033)
文摘We proposc and numerically investigate the optical transmission behaviors of a subwavelength metal film perforated with a two-dimensional square array of compound circular holes.Enhanced optical transmission is obtained by using the finite-difference time-domain（FDTD）method,which can be mainly attributed to the excitation and coupling of localized surface plasmon resonances（LSPRs） and surface plasmon polaritons（SPPs）,and Fano Resonances.The redshift of the transmission peak can be achieved by enlarging the size and number of small holes,the environmental dielectric constant.These indicate that the proposed structure has potential applications in integrated optoelectronic devices such as plasmonic filters and sensors.
文摘Carbon nanotubes(CNTs)hold immense promise for a wide array of applications due to their exceptional physical and chemical properties.Understanding and controlling their structural characteristics,particu-larly the diameter and number of walls,is crucial for harnessing their full potential.We investigated the relationship between these parameters for both commercially available and lab-scale CNTs,spanning a wide range of outer diameters(1-13 nm)and numbers of walls(1-13).Our findings revealed a com-monality among the structural diversity,rather than a random distribution,as evidenced by a piecewise linear relationship between the outer diameter and number of walls,with an inflection point occurring at approximately 4 nm in diameter.This observation is unexpected,as the CNTs were synthesized using different approaches and growth conditions;yet,as a group,they exhibit a“structural scaling”.Addi-tionally,we made an intriguing observation:despite increases in outer diameter and number of walls,the inner diameters remained relatively constant(4-5 nm)for thicker CNTs with more than three walls.These results suggest that structural properties can be estimated based on diameter,which not only ad-vances our fundamental understanding of CNT synthesis but also provides practical insights for tailoring CNT properties for various applications.
