Aarti Diwan, Pooja Yadav, Abhishek S. Shekhawat, Akila C, Dhatchayani M, Rituraj Sharma, Anand M. Shrivastav, Rajesh Kumar, Tulika Srivastava* and Shailendra K. Saxena*,
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引用次数: 0
摘要
激子-等离子体耦合是一种迷人的物理现象，在各种金属半导体系统中都进行过研究。有意选择硅纳米线（SiNWs）系统作为提供激子的宿主材料，并选择氧化硅作为薄电介质。在金属纳米粒子（MNP）装饰的硅纳米线（D-SiNWs）上观察到了明显的光致发光（PL）峰蓝移和可见范围吸收的显著增加，这表明存在激子-等离子体耦合。进一步的研究表明，发生等离子体诱导共振能量转移（PIRET）机制的可能性更大。与铂相比，金装饰的 SiNW 中的聚光强度增强更高（∼38 倍），这是因为在金属和半导体界面附近存在一个强的局部等离子体电场。此外，金装饰 SiNW 的光致发光分裂可能是由于存在偶极子-四偶极子耦合以及偶极子-偶极子耦合，这进一步增加了 PIRET 机制的强度。
Unraveling Exciton–Plasmon Coupling and the PIRET Mechanism in Decorated Silicon Nanowires
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.
期刊介绍：
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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