JOURNAL ARTICLE

Plexcitonic crystals: a tunable platform for light-matter interactions

Ertugrul Karademir, Sinan Balci, Coskun Kocabas, Atilla Aydinli
Optics Express 2014 September 8, 22 (18): 21912-20
25321566
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.

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