摘要
基于阳极氧化铝模板,采用真空蒸镀技术,制备了高度有序的周期性银纳米球阵列.阵列几何结构参数调控实验发现,通过控制蒸镀厚度,可实现对阵列中银纳米球尺寸(直径)和间距的有效调控,进而有效实现对紫外-可见-近红外各波段吸收峰位和峰宽的调制.吸收光谱测试显示,该纳米阵列在紫外、可见和近红外波段都具有明显的电磁波吸收特性.时域有限差分理论模拟结合实验分析不同波段光吸收特性的物理机制,紫外超窄强吸收为银、铝介电环境非对称诱发的法诺共振,可见波段吸收源自于银纳米粒子局域表面等离子体共振,近红外波段强吸收为银纳米球阵列表面晶格共振所激发.
In this paper,the highly ordered periodic silver nanosphere arrays are fabricated by vacuum evaporation based on anodic aluminum oxide(AAO)template.The diameter and spacing of silver nanosphere in the arrays are adjusted just by controlling the thickness of evaporation.Furthermore,this can effectively modulate the absorption peaks and bandwidths in ultraviolet-visible-near-infrared regions.The measurement results of absorption spectra show that the nano-arrays have obvious electromagnetic wave absorption characteristics in the ultraviolet,visible and near-infrared bands.The finite-difference time-domain theoretical simulation combined with experiments is used to analyze the physical mechanism of light absorption characteristics in different wavebands.The ultraviolet strong absorption is due to the Fano resonance induced by asymmetric dielectric environment of silver and aluminum;the visible absorption originates from local surface plasmon resonance of silver nanoparticles;the near-infrared strong absorption is attributed to the surface lattice resonance of silver nanosphere arrays.
作者
梁玲玲
赵艳
冯超
Liang Ling-Ling;Zhao Yan;Feng Chao(Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China;Institute of Applied Mathematics and Physics,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Trans-scale Laser Manufacturing Technology,Ministry of Education,Beijing 100124,China;Beijing Engineering Research Center of Laser Technology,Beijing 100124,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第6期207-215,共9页
Acta Physica Sinica
基金
国家自然科学基金(批准号:51475014)资助的课题~~
关键词
局域表面等离子体激元
纳米阵列
阳极氧化铝
吸收峰位
localized surface plasmon
nano arrays
anodic aluminum oxide
absorption peak-position
