This Letter reports the formation of periodic surface structures on Ni–Fe film irradiated by a single femtosecond laser pulse. A concave lens with a focus length of-150 mm is placed in front of an objective（100×...This Letter reports the formation of periodic surface structures on Ni–Fe film irradiated by a single femtosecond laser pulse. A concave lens with a focus length of-150 mm is placed in front of an objective（100×, NA=0.9）,which transforms the Gaussian laser field into a ring distribution by the Fresnel diffraction. Periodic ripples form on the ablation area after the irradiation of a single femtosecond laser pulse, which depends on the laser polarization and laser fluence. We propose that the ring structure of the laser field leads to a similar transient distribution of the permittivity on the sample surface, which further launches the surface plasmon polaritons. The interaction of the incident laser with surface plasmon polaritons dominates the formation of periodic surface structures.展开更多
We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ri...We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ridge refractive index on propagation length and mode width is discussed and simulated with the finite ele- ment raethod. The result shows that the SPP can propagate as long as 3.42 mm, as well as the mode width keeping as 1.64μm, a better one compared with the fixed refractive index. Considering its nanoscale dimension and outstanding performance, the structure is easily realized when connected with electrodes.展开更多
目的：建立基于单粒子光学传感技术的光阻法（LE/SPOS法）,对脂肪乳静脉注射液中乳滴粒径大于5μm的尾部大粒子进行准确控制。方法：采用EXT模式（1.8-50μm）,稀释流速60 m L·min-1,目标粒子数2000个·m L^-1,进样量0.98 m L...目的：建立基于单粒子光学传感技术的光阻法（LE/SPOS法）,对脂肪乳静脉注射液中乳滴粒径大于5μm的尾部大粒子进行准确控制。方法：采用EXT模式（1.8-50μm）,稀释流速60 m L·min-1,目标粒子数2000个·m L^-1,进样量0.98 m L,对仪器校正和检定后,分别对系统适用性、样品测定的精密度和中间精密度、回收率等方法学进行系统考察,并对多批乳剂样品进行检测。结果：5、10、25μm标准粒子测得的粒径大小和颗粒数均在标称值6%以内;不同PFAT5水平的脂肪乳样品测定的RSD≤5%,2台仪器测定的RSD〈10%,低、中、高3个PFAT5水平的5μm标准粒子平均回收率为100.5%,RSD〈2.0%（n=6）;8批乳剂样品PFAT5测得值在0.010%-0.066%。结论：建立的光阻法操作简便,符合方法学考察要求,能够对脂肪乳静脉注射液中的PFAT5进行准确定量。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 11474097, 11274116, 11104178, 44108280, and 51132004)the National Special Science Research Program of China (No. 2011CB808105)
文摘This Letter reports the formation of periodic surface structures on Ni–Fe film irradiated by a single femtosecond laser pulse. A concave lens with a focus length of-150 mm is placed in front of an objective（100×, NA=0.9）,which transforms the Gaussian laser field into a ring distribution by the Fresnel diffraction. Periodic ripples form on the ablation area after the irradiation of a single femtosecond laser pulse, which depends on the laser polarization and laser fluence. We propose that the ring structure of the laser field leads to a similar transient distribution of the permittivity on the sample surface, which further launches the surface plasmon polaritons. The interaction of the incident laser with surface plasmon polaritons dominates the formation of periodic surface structures.
基金supported by the National Natural Science Foundation of China(Nos.61275201 and 61372037)the Beijing Excellent Ph.D.Thesis Guidance Foundation(No.20131001301)+1 种基金the Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications)the Opened Fund of the State Key Laboratory on Integrated Optoelectronics,Institute of Semiconductors,Chinese Academy of Sciences
文摘We propose and analyze a long-range dielectric-loaded surface plasmon polariton （SPP） waveguide based on graded-index ridge over server millimeter distances. Then the influence of the dielectric thickness and the ridge refractive index on propagation length and mode width is discussed and simulated with the finite ele- ment raethod. The result shows that the SPP can propagate as long as 3.42 mm, as well as the mode width keeping as 1.64μm, a better one compared with the fixed refractive index. Considering its nanoscale dimension and outstanding performance, the structure is easily realized when connected with electrodes.
文摘目的：建立基于单粒子光学传感技术的光阻法（LE/SPOS法）,对脂肪乳静脉注射液中乳滴粒径大于5μm的尾部大粒子进行准确控制。方法：采用EXT模式（1.8-50μm）,稀释流速60 m L·min-1,目标粒子数2000个·m L^-1,进样量0.98 m L,对仪器校正和检定后,分别对系统适用性、样品测定的精密度和中间精密度、回收率等方法学进行系统考察,并对多批乳剂样品进行检测。结果：5、10、25μm标准粒子测得的粒径大小和颗粒数均在标称值6%以内;不同PFAT5水平的脂肪乳样品测定的RSD≤5%,2台仪器测定的RSD〈10%,低、中、高3个PFAT5水平的5μm标准粒子平均回收率为100.5%,RSD〈2.0%（n=6）;8批乳剂样品PFAT5测得值在0.010%-0.066%。结论：建立的光阻法操作简便,符合方法学考察要求,能够对脂肪乳静脉注射液中的PFAT5进行准确定量。
