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Prof. Sohair Negm :: Publications:

Rabi like angular splitting in surface Plasmon Polariton-Exciton interaction in ATR configuration
Authors: H Hassan, T. Abdallah, S. Negm, H. Talaat
Year: 2018
Keywords: Surface Plasmon Polaritons (SPPs)Exciton generation in semiconductor QDsPlasmon-exciton couplingRabi splitting
Journal: Applied Surface Science
Volume: 441
Issue: 6 February 2018
Pages: 341-346
Publisher: ElSEVIER
Local/International: International
Paper Link:
Full paper Sohair Negm _last paper 2018 Sohair.pdf
Supplementary materials Not Available

We have studied the coupling of propagating Surface Plasmon Polaritons (SPP) on silver films and excitons in CdS quantum dots (QDs). We employed the Kretschmann-Raether configuration of the attenuated total reflection (ATR) to propagate the SPP on silver film of thickness 47.5 nm at three different wavelengths. The CdS QD have been chemically synthesized with particular size such that its exciton of energy would resonate with SPP. High resolution transmission electron microscopy (HRTEM) and scan tunneling microscopy (STM) were used to measure the corresponding QDs size and confirm its shape. Further confirmation of the size has been performed by the effective mass approximation (EMA) model utilizing the band gap of the prepared QDs. The band gaps have been measured through UV–vis absorption spectra as well as scan tunneling spectroscopy (STS). The coupling has been observed as two branching dips in the ATR spectra indicating Rabi like splitting. To the best of our knowledge, this is the first time that Rabi interaction is directly observed in an ATR angular spectra. This observation is attributed to the use a high resolution angular scan (±0.005°), in addition to the Doppler width of the laser line as well as the energy distribution of the excitons. The effect of three different linker molecules (TOPO, HDA), (Pyridine) and (Tri-butylamine) as surface ligands, on SPP-Exciton interaction has been examined.

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