Plasmonic band gap engineering of plasmon-exciton coupling

Controlling plasmon-exciton coupling through band gap engineering of plasmonic crystals is demonstrated in the Kretschmann configuration. When the flat metal surface is textured with a sinusoidal grating only in one direction, using laser interference lithography, it exhibits a plasmonic band gap be...

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Bibliographic Details
Published in:Optics letters 2014-10, Vol.39 (19), p.5697-5700
Main Authors: Karademir, Ertugrul, Balci, Sinan, Kocabas, Coskun, Aydinli, Atilla
Format: Article
Language:English
Subjects:
Crystals
Diffraction gratings
Gratings (spectra)
Joining
Lithography
Plasmonics
Polaritons
Reflection
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Summary:Controlling plasmon-exciton coupling through band gap engineering of plasmonic crystals is demonstrated in the Kretschmann configuration. When the flat metal surface is textured with a sinusoidal grating only in one direction, using laser interference lithography, it exhibits a plasmonic band gap because of the Bragg scattering of surface plasmon polaritons on the plasmonic crystals. The contrast of the grating profile determines the observed width of the plasmonic band gap and hence allows engineering of the plasmonic band gap. In this work, resonant coupling between the molecular resonance of a J-aggregate dye and the plasmonic resonance of a textured metal film is extensively studied through plasmonic band gap engineering. Polarization dependent spectroscopic reflection measurements probe the spectral overlap occurring between the molecular resonance and the plasmonic resonance. The results indicate that plasmon-exciton interaction is attenuated in the band gap region along the grating direction.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.005697