title: Plexcitonic crystals: a tunable platform for light-matter interactions.
abstract: Coupled states of surface plasmon polaritons (SPPs) and excitons are collectively called plexcitons [Nano Lett.8, 3481 (2008)]. Plexcitonics is an emerging field of research aiming to control light-matter interaction at the nanometer length scale using coupled pairs of surface-plasmons and excitons. Ability to control the interaction between localized excitons and propagating surface-plasmons is important for realization of new photonic devices. In this letter, we report plexcitonic crystals that yield direction-dependent plasmon-exciton coupling. We have fabricated one- and two-dimensional plexcitonic crystals on periodically corrugated silver surfaces, which are loaded with J-aggregate complexes. We show that plasmon-exciton coupling is blocked for some crystal directions when exciton energy falls inside the plasmonic band gap of the periodically corrugated metallic surface.
authors.forename: Ertugrul
authors.initials: E
authors.lastname: Karademir
authors.forename: Sinan
authors.initials: S
authors.lastname: Balci
authors.forename: Coskun
authors.initials: C
authors.lastname: Kocabas
authors.forename: Atilla
authors.initials: A
authors.lastname: Aydinli