Single gold nanoshell with mutilpolar plasmon resonances is proposed to enhance two-photon fluorescence efficiently.The single emitter single nanoshell configuration is studied systematically by employing the finite-d...Single gold nanoshell with mutilpolar plasmon resonances is proposed to enhance two-photon fluorescence efficiently.The single emitter single nanoshell configuration is studied systematically by employing the finite-difference time-domain method.The emitter located inside or outside the nanoshell at various positions leads to a significantly different enhancement effect.The fluorescent emitter placed outside the nanoshell can achieve large fluorescence intensity given that both the position and orientation of the emission dipole are optimally controlled.In contrast,for the case of the emitter placed inside the nanoshell,it can experience substantial two-photon fluorescence enhancement without strict requirements upon the position and dipole orientations.Metallic nanoshell encapsulating many fluorescent emitters should be a promising nanocomposite configuration for bright two-photon fluorescence label.The results provide a comprehensive understanding about the plasmonic-enhanced two-photon fluorescence behaviors,and the nanocomposite configuration has great potential for optical detecting,imaging and sensing in biological applications.展开更多
以聚苯乙烯微球为模板,采用种子-生长法在聚苯乙烯微球表面镀覆金球壳层,以不同浓度旋涂分散在阴极衬底上,热处理去除聚苯乙烯模板,初步制备出表面具有金球壳结构的反射式金阴极样品,通过金相显微镜和扫描电镜研究其表面形貌,结果表明:...以聚苯乙烯微球为模板,采用种子-生长法在聚苯乙烯微球表面镀覆金球壳层,以不同浓度旋涂分散在阴极衬底上,热处理去除聚苯乙烯模板,初步制备出表面具有金球壳结构的反射式金阴极样品,通过金相显微镜和扫描电镜研究其表面形貌,结果表明:阴极表面球壳的直径约为10μm,高温去除聚苯乙烯微球模板后金沉积层具有良好的自支撑性,球壳厚度约70—90 nm,球壳表面主要由30—60 nm的晶粒突起组成.X射线光电发射测试表明,反射式球壳结构阴极在200—1500 e V波段光电效率相对于平面薄膜阴极有明显提升,其量子效率可达到平面阴极的3倍以上,理论分析表明:球壳结构阴极特殊的表面结构引起光电发射面积的增大和表面势垒的降低,是阴极光电发射效率提高的主要原因.展开更多
基金supported by the National Key Basic Research Program of China(Grant No.2013CB328703)the National Natural Science Foundation of China(Grant Nos.11374026,91221304 and 11121091)
文摘Single gold nanoshell with mutilpolar plasmon resonances is proposed to enhance two-photon fluorescence efficiently.The single emitter single nanoshell configuration is studied systematically by employing the finite-difference time-domain method.The emitter located inside or outside the nanoshell at various positions leads to a significantly different enhancement effect.The fluorescent emitter placed outside the nanoshell can achieve large fluorescence intensity given that both the position and orientation of the emission dipole are optimally controlled.In contrast,for the case of the emitter placed inside the nanoshell,it can experience substantial two-photon fluorescence enhancement without strict requirements upon the position and dipole orientations.Metallic nanoshell encapsulating many fluorescent emitters should be a promising nanocomposite configuration for bright two-photon fluorescence label.The results provide a comprehensive understanding about the plasmonic-enhanced two-photon fluorescence behaviors,and the nanocomposite configuration has great potential for optical detecting,imaging and sensing in biological applications.
文摘以聚苯乙烯微球为模板,采用种子-生长法在聚苯乙烯微球表面镀覆金球壳层,以不同浓度旋涂分散在阴极衬底上,热处理去除聚苯乙烯模板,初步制备出表面具有金球壳结构的反射式金阴极样品,通过金相显微镜和扫描电镜研究其表面形貌,结果表明:阴极表面球壳的直径约为10μm,高温去除聚苯乙烯微球模板后金沉积层具有良好的自支撑性,球壳厚度约70—90 nm,球壳表面主要由30—60 nm的晶粒突起组成.X射线光电发射测试表明,反射式球壳结构阴极在200—1500 e V波段光电效率相对于平面薄膜阴极有明显提升,其量子效率可达到平面阴极的3倍以上,理论分析表明:球壳结构阴极特殊的表面结构引起光电发射面积的增大和表面势垒的降低,是阴极光电发射效率提高的主要原因.
