Department of Cogno-Mechatronics Engineering, Pusan National University , Busan 46241, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Jul 26;9(29):24433-24439. doi: 10.1021/acsami.7b06977. Epub 2017 Jul 17.
Magnetoplasmonic FeO-coated Ag nanoparticles (NPs) are assembled in large scale (18 × 18 mm) in order to observe unique modulation of plasmonic coupling and optical tunable application via both external magnetic field and the combination of magnetic dipole and electrostatic interactions of particle-particle and particle-substrate. These large nanochains film exhibits outstanding tunability of plasmonic resonance from visible to near-infrared range by controlling the polarization angle and interparticle distance (IPD). The enormous spectral shift mainly originated from far-field rather than near-field coupling of Ag cores because of the sufficiently large separation between them in which FeO shell acts as spacer. This tunable magnetoplasmonic film can be applicable in the field of anisotropic optical waveguides, tunable optical filter, and nanoscale sensing platform.
为了观察通过外加磁场以及粒子-粒子和粒子-基底之间的磁偶极子和静电力相互作用的组合对等离子体耦合的独特调制和光学可调谐应用，将磁等离子体 FeO 涂层 Ag 纳米粒子 (NPs) 大规模 (18×18mm) 组装。这些大纳米链膜通过控制偏振角和粒子间距离 (IPD)，表现出从可见光到近红外范围的等离子体共振的出色可调谐性。巨大的光谱位移主要源于远场而不是 Ag 核的近场耦合，因为它们之间的间隔足够大，其中 FeO 壳作为间隔物。这种可调谐的磁等离子体膜可应用于各向异性光波导、可调谐光滤波器和纳米尺度传感平台。
