AI Article Synopsis
- Exciton-plasmon coupling is explored in silicon nanowires decorated with metal nanoparticles, leading to significant changes in photoluminescence and absorption properties.
- A blue-shift in PL peak and increased absorption in the visible range indicate this coupling, highlighting the presence of plasmon-induced resonance energy transfer (PIRET).
- Gold-decorated SiNWs exhibit a 38-fold increase in PL intensity compared to platinum due to stronger electric fields, with additional PL splitting suggesting complex interactions like dipole-quadrupole coupling enhancing PIRET.
Article Abstract
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.
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| http://dx.doi.org/10.1021/acs.jpclett.4c01010 | DOI Listing |
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