Open AccessSurface plasmon bandwidth increase using chirped-pitch linear diffraction gratings
Author(s) -
Erin Bailey,
Ribal Georges Sabat
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.006904
Subject(s) - optics , materials science , surface plasmon , surface plasmon resonance , diffraction grating , chirp , diffraction , surface plasmon polariton , diffraction efficiency , localized surface plasmon , laser , wavelength , full width at half maximum , optoelectronics , plasmon , grating , physics , nanoparticle , nanotechnology
Large-scale linear diffraction gratings with gradually varying pitch were photo-inscribed onto the surface of azobenzene thin films using a 532 nm laser and a modified Lloyd mirror set-up. By placing a cylindrical lens in front of the direct half of the inscribing beam, gratings with a chirping rate as high as 12.9 nm/mm were produced. Subsequently, when these chirped-pitch gratings were coated with silver, over three-fold bandwidth increase was observed in the surface plasmon transmission peaks at FWHM, when compared to constant-pitch gratings. This was made possible due to the simultaneous excitation of surface plasmon resonance in a band of light wavelengths.