Time-dependent first-principles study of optical response of BaTiO3quantum dots coupled with silver nanowires

• 来源期刊: 中国物理B（英文版）
• 关键词: perovskite QDs TDDFT plasmon resonance
• 年，卷（期）: 2019,（6）
• 页码范围: 414-420
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/6/067301

摘要

All-inorganic perovskite quantum dots (QDs) have drawn much attention due to their prominent quantum-size effects and highly tunable optical properties. Tuning the size of perovskite QDs is attractive for many potential applications. For instance, smaller QDs exhibit more evident quantum properties than larger QDs, but present a blue-shifted spectrum, which limits their applications. Here, we conduct a systematically theoretical analysis about the optical response and plasmon resonance of comparatively small barium titanate quantum dots (BTO–QDs) coupled with silver (Ag) nanowires based on time-dependent density functional theory (TDDFT). Our results show that the silver nanowires can induce an intense optical response respectively in the infrared and visible region to eliminate the spectrum-shift. Furthermore, the absorption spectrum and plasmon resonance can be effectively modified by either altering the position of the silver nanowires or changing the thickness of the BTO–QDs. More importantly, these two methods can act simultaneously, this maybe provide a new approach to implementing the quantum control.