Open AccessGiant angular dispersion mediated by plasmonic modal competition
Author(s) -
Chao Yi Tai,
Wen Hsiang Yu,
Sheng Hsiung Chang
Publication year - 2010
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.18.024510
Subject(s) - optics , wavelength , surface plasmon , plasmon , dispersion (optics) , modal dispersion , physics , excitation , coupling (piping) , materials science , dispersion shifted fiber , optical fiber , fiber optic sensor , quantum mechanics , metallurgy
We report on the modal competition mediated angular dispersion by heterogeneously coupled plasmonic waveguides. By varying the wavelength of the excitation, the surface waves propagate alongside the upper and lower interfaces can be manipulated in coupled, decoupled, and cutoff regimes. Depending on the coupling states, the output beam can be steered between +15° and -17° for wavelength from λ = 695 nm to λ = 675 nm. The maximum achieved angular dispersion can be as large as 2.1°/nm. This finding may revolutionize current design concept of spectrometers, providing a significant way to scale down the form factor further into nano-size.