RT Journal Article T1 Increasing applicability of slow light in molecularaggregate nanofilms with two-exciton dynamics A1 Díaz García, Elena A1 Cabrera Granado, Eduardo A1 Gómez Calderón, Óscar AB We study the slow-light performance in the presence of exciton – exciton interaction in films of linear molecular aggregates at the nanometer scale. In particular, we consider a four-level model to describe the creation/annihilation of two-exciton states that are relevant for high-intensity fields.Numerical simulations show delays comparable to those obtained for longer propagation distances in other media. Two-exciton dynamics could lead to larger fractional delays, even in presence of disorder, in comparison to the two-levelapproximation. We conclude that slow-light performance is a robust phenomenon in these systems under the increasing complexity of the two-exciton dynamics. SN 0146-9592 YR 2016 FD 2016-05-25 LK https://hdl.handle.net/20.500.14352/23081 UL https://hdl.handle.net/20.500.14352/23081 LA eng NO © 2016 Optical Society of America.Funding. MINECO (MAT2013-46308, FIS2013-41709-P). NO Ministerio de Economía y Competitividad (MINECO) DS Docta Complutense RD 18 abr 2025