We report on the experimental and theoretical investigations of enhancing the optical absorption of organic molecules in the weak plasmon–exciton coupling regime. A metal–organic hybrid structure consisting of dye molecules embedded in the polymer matrix is placed in close vicinity to thin metal films. We have observed a transition from a weak coupling regime to a strong coupling one as the thickness of the metal layer increases. The results indicate that absorption of the self-assembled J-aggregate nanostructures can be increased in the weak plasmon–exciton coupling regime and strongly quenched in the strong coupling regime. A theoretical model based on the transfer-matrix method qualitatively confirms the experimental results obtained from polarization-dependent spectroscopic reflection measurements.
© 2014 Optical Society of America
Optics at Surfaces
Original Manuscript: July 4, 2014
Revised Manuscript: July 20, 2014
Manuscript Accepted: July 20, 2014
Published: August 18, 2014
Sinan Balci, Ertugrul Karademir, Coskun Kocabas, and Atilla Aydinli, "Absorption enhancement of molecules in the weak plasmon–exciton coupling regime," Opt. Lett. 39, 4994-4997 (2014)