Yang Hanning, Owiti Edgar Oduor, Jiang Xiangqian, Li Siren, Liu Peng, Sun Xiudong
Institute of Modern Optics, Department of Physics, Harbin Institute of Technology, Harbin, 150001, China.
Key Laboratory of Micro-Nano Optoelectronic Information System of Ministry of Industry and Information Technology, Harbin, 150001, China.
Nanoscale Res Lett. 2017 Dec;12(1):430. doi: 10.1186/s11671-017-2062-4. Epub 2017 Jun 30.
Misaligned edge-to-edge dimers are the common products during the preparation of Ag nanoprism dimers using self-assembly method. However, in the self-assembly method, Ag nanoprisms are easily truncated because they are easy to oxidize in an acidic environment. In this work, modeling a truncated Ag nanoprism on a misaligned edge-to-edge dimer provides a better understanding of the effects of the truncation and misalignment on localized surface plasmon resonance (LSPR) of the dimer. The resonant wavelength and intensity of the dimer are flexibly modulated by changing the misalignment length of the dimer. As the misalignment length increases, a stronger peak at the shorter wavelength and a weaker one at the longer wavelength are observed. The resonant wavelengths and intensities of the two peaks are also flexibly tuned by adjusting the truncated length of the Ag nanoprism in the dimer. The results are numerically demonstrated based on the finite element method (FEM) and show promising potential for nanoswitch, multi-channel tunable biosensor and other nanodevice applications.
在使用自组装方法制备银纳米棱镜二聚体的过程中，边缘错位的面对面二聚体是常见产物。然而，在自组装方法中，银纳米棱镜很容易被截断，因为它们在酸性环境中容易氧化。在这项工作中，对边缘错位的面对面二聚体上的截断银纳米棱镜进行建模，能更好地理解截断和错位对二聚体局域表面等离子体共振（LSPR）的影响。通过改变二聚体的错位长度，可以灵活地调节二聚体的共振波长和强度。随着错位长度增加，在较短波长处观察到更强的峰，在较长波长处观察到较弱的峰。通过调整二聚体中银纳米棱镜的截断长度，还可以灵活地调节两个峰的共振波长和强度。基于有限元方法（FEM）对结果进行了数值验证，结果表明其在纳米开关、多通道可调生物传感器和其他纳米器件应用方面具有广阔的潜力。
