Exciton–plasmon coupling is a fascinating physical phenomenon that has been investigated in various metal semiconductor systems. Intentionally chosen silicon nanowires (SiNWs) systems act as a host material for providing exciton as well as silicon oxide as a thin dielectric. A clear blue-shift in photoluminescence (PL) peak and a significant increase in visible range absorption were observed for metal nanoparticle (MNP) decorated SiNWs (D-SiNWs) which signifies the presence of exciton–plasmon coupling. A further investigation reveals that the possibility of the occurrence of the plasmon-induced resonance energy transfer (PIRET) mechanism is higher. The PL intensity enhancement in Au-decorated SiNWs is higher (∼38 times) in comparison to that in Pt due to the presence of a strong and localized electric field of plasmons near the interface of metal and semiconductors. Moreover, splitting in PL for gold-decorated SiNWs might be due to the presence of dipole–quadrupole coupling along with dipole–dipole coupling, which further increases the strength of the PIRET mechanism.

中文翻译：

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揭示装饰硅纳米线中的激子-等离子体激元耦合和 PIRET 机制

激子-等离子体耦合是一种令人着迷的物理现象，已在各种金属半导体系统中进行了研究。特意选择的硅纳米线 (SiNW) 系统充当提供激子的主体材料以及作为薄电介质的氧化硅。金属纳米粒子（MNP）装饰的SiNW（D-SiNW）的光致发光（PL）峰出现明显的蓝移，可见光范围吸收显着增加，这表明激子-等离子体耦合的存在。进一步的研究表明，等离激元诱导共振能量转移（PIRET）机制发生的可能性较高。由于金属和半导体界面附近存在强且局域的等离子体激元电场，Au 装饰的 SiNW 的 PL 强度增强比 Pt 更高（约 38 倍）。此外，金装饰SiNWs的PL分裂可能是由于偶极-四极耦合以及偶极-偶极耦合的存在，这进一步增加了PIRET机制的强度。