Diffraction grating revisited: a high-resolution plasmonic dispersive element

Details Diffraction grating revisited: a high-resolution plasmonic dispersive element Diffraction grating revisited: a high-resolution plasmonic dispersive element

2005-09-08

arxiv.org/abs/cond-mat/0509222v1

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 3 figures

Scientific paper

The spectral dispersion of light is critical in applications ranging from spectroscopy to sensing and optical communication technologies. We demonstrate that ultra-high spectral dispersion can be achieved with a finite-size surface plasmon polaritonic (SPP) crystal. The 3D to 2D reduction in light diffraction dimensions due to interaction of light with collective electron modes in a metal is shown to increase the dispersion by some two orders of magnitude, due to a two-stage process: (i) conversion of the incident light to SPP Bloch waves on a nanostructured surface and (ii) Bloch waves traversing the SPP crystal boundary. This has potential for high-resolution spectrograph applications in photonics, optical communications and lab-on-a-chip, all within a planar device which is compact and easy to fabricate.

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