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Updated: Jul 9, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Enhanced circular dichroism of molecular J-aggregate-surface plasmon polariton hybrid modes
Rohit Umashankar Yadav1, Parinda Vasa1
1Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, India. parinda@iitb.ac.in.
Abstract:
We report the observation of enhanced circular dichroism (CD) in a molecular J-aggregate-metal hybrid system exhibiting strong J-aggregate-surface plasmon polariton (SPP) interaction. The hybrid system is formed by spin-coating chiral TDBC dye onto a 50 nm thick silver film. Angle-resolved reflectivity measurements in the Kretschmann configuration reveal the formation of coupled molecular J-aggregate-SPP polariton modes with a large normal mode splitting energy of ∼365 meV. The chiro-optical response of the hybrid system exhibits a significant ∼62-fold enhancement in CD, accompanied by a large difference of ∼2% between LCP and RCP reflectivity spectra compared to the chiro-optical response of the J-aggregate film coated onto a glass substrate. Based on the COMSOL simulations, the CD enhancement is attributed to the relatively delocalized nature of the SPP modes, facilitating the coupling of a large number of molecules (∼1000) to the same SPP mode. Such a collective interaction results in an increased effective dipole moment of the J-aggregate and the corresponding normal mode splitting as well as the CD. The enhanced CD and the sensitivity of the polariton dispersion to the coupling strength demonstrate the potential of strong J-aggregate-SPP interaction in the hybrid system for detecting weak CD signatures in thin films and investigating the chiro-optical response of the hybrid modes.
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