Fano resonance of radiative direction in Krestchmann configuration induced by strong coupling

TL;DR

This paper studies Fano resonance and strong coupling effects in a Kretschmann configuration with molecular J-aggregates, revealing how surface plasmon polaritons convert into light with potential sensing and optical applications.

Contribution

It demonstrates the Fano resonance and Rabi splitting in SPP-molecule interactions using classical and FDTD methods, highlighting strong coupling phenomena.

Findings

Fano line shape in radiative angle versus wavelength

Observation of Rabi splitting indicating strong coupling

High sensitivity of the structure to wavelength changes

Abstract

We investigate the strong coupling phenomenon in Kretschmann configuration involving molecular J-aggregates by using surface plasmon polaritons (SPPs) as a light source. SPPs are injected in molecular J-aggregates and propagate along the interface between molecular J-aggregates and the metal film. Both the classical method and Finite difference time domain method are used to show the radiative characteristics of light converted from SPPs in our proposed structure, with the results from the two methods being consistent with each other. Our results show that the radiative angle versus the wavelength shows a Fano line shape and the conversion efficiency of SPPs into light exhibits the strong coupling phenomenon in form of Rabi splitting. Our structure is quite sensitive to the wavelength, which has potential applications in sensing, lasing, optical switching, and nonlinear slow-light devices.