Tuning the exciton-plasmon coupling
Author(s)
Advisor
Aydınlı, AtillaDate
2012Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Exciton-plasmon coupling has recently drawn much interest. In this work, FDTD
simulations of exciton-plasmon coupling in plasmonic cavity structures with
corrugation patterns are investigated. Excitonic modes are obtained from a Lorentz
absorber modeling of a J-aggregate organic dye. The coupling of these excitonic and
plasmonic modes on Ag thin films is demonstrated. Rabi splitting due to coupling
was clearly observed. Flat metallic surfaces, uniform gratings and Moiré surfaces are
used in simulations as corrugation patterns. Metal film thickness and dye
concentration dependence of Rabi splitting via exciton-plasmon coupling was also
observed on thin flat Ag films. We show that Rabi splitting occurs even at low dye
concentrations, and the magnitude of splitting increases as dye concentration
increases. A new state in the band gap is observed when the total oscillator strength
is increased. Large Rabi splitting is observed when plasmon damping is modulated.
Exciton-plasmon coupling on uniform gratings is studied as a function of cavity size,
corrugation periodicity and depth. Q factor and Rabi splitting behavior of excitonplasmon
coupling on Moiré cavities are investigated as a function of cavity size.
Strong anti-crossing is observed when the excitonic absorption matches with the
cavity state.