基于含时密度泛函理论,研究了等边三角形硅烯纳米结构的等离激元特性.沿三角形所在平面方向激发时,体系中有2个主要的等离激元共振带,其线形基本相同.这一特性与体系的边界构型以及尺度大小无关.沿垂直于纳米结构所在的平面方向激发时,体系中有2个等离激元共振带,分别位于6.8 eV和15 eV附近.这2个主要等离激元共振带的线形与三角形的大小以及边界的构型无关,其共振强度依赖于体系尺度的大小.
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