Department of Physics, University of Texas at Austin, Austin, TX, 78712; Department of Physics, University of South Carolina, Columbia, SC, 29208.
Adv Mater. 2014 Sep 17;26(35):6106-10. doi: 10.1002/adma.201401474. Epub 2014 Jun 13.
Using atomically smooth epitaxial silver films, new optical permittivity highlighting significant loss reduction in the visible frequency range is extracted. Largely enhanced propagation distances of surface plasmon polaritons are measured, confirming the low intrinsic loss in silver. The new permittivity is free of extrinsic spectral features associated with grain boundaries and localized plasmons inevitably present in thermally deposited films.
使用原子级平滑的外延银膜，提取出在可见光频段显著降低损耗的新光学介电常数。测量到表面等离激元极化激元的传播距离大大增加，证实了银的低固有损耗。新的介电常数没有与晶粒边界相关的外在光谱特征，也没有热沉积膜中不可避免存在的局域等离激元。
