Anomalous Dispersion in Reflection and Emission of Dye Molecules Strongly Coupled to Surface Plasmon Polaritons

Author:

Chowdhury Md Golam Rabbani1ORCID,Hesami Leila1,Khabir Kanij Mehtanin1,Howard Shamaar R.1ORCID,Rab Md Afzalur1,Noginova Natalia1,Noginov Mikhail A.1

Affiliation:

1. Center for Materials Research, Norfolk State University, Norfolk, VA 23504, USA

Abstract

We have studied dispersion of surface plasmon polaritons (SPPs) in the Kretschmann geometry (prism/Ag/dye-doped polymer) in weak, intermediate, and ultra-strong exciton–plasmon coupling regimes. The dispersion curves obtained in the reflection experiment were in good agreement with the simple model predictions at small concentrations of dye (Rhodamine 590, Rh590) in the polymer (Poly(methyl methacrylate), PMMA). At the same time, highly unusual multi-segment “staircase-like” dispersion curves were observed at extra-large dye concentrations, also in agreement with the simple theoretical model predicting large, small, and negative group velocities featured by different polariton branches. In a separate experiment, we measured angular dependent emission of Rh590 dye and obtained the dispersion curves consisting of two branches, one nearly resembling the SPP dispersion found in reflection and the second one almost horizontal. The results of our study pave the road to unparalleled fundamental science and future applications of weak and strong light—matter interactions.

Funder

NSF

DOE

SNL LDRD

HBCU START

Publisher

MDPI AG

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