Compact Bragg gratings for long-range surface plasmon polaritons

By introducing periodic thickness modulation of thin metal stripes embedded in a dielectric, compact and efficient Bragg gratings for long-range surface plasmon polaritons (LR-SPPs) operating around 1550 nm are realized. Reflection and transmission spectra of the gratings having different lengths (f...

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Bibliographic Details
Published in:Journal of lightwave technology 2006-02, Vol.24 (2), p.912-918
Main Authors: Boltasseva, A., Bozhevolnyi, S.I., Nikolajsen, T., Leosson, K.
Format: Article
Language:English
Subjects:
Applied sciences
Bragg gratings
Diffraction gratings
Exact sciences and technology
Gratings (spectra)
Information, signal and communications theory
Integrated optics devices
Mathematical analysis
Modulation
Modulation, demodulation
multiple scattering
Optical feedback
Optical films
Optical filters
Optical losses
Optical reflection
Optical scattering
Optical surface waves
Optical waveguides
Plasmons
Polaritons
Signal and communications theory
Spectra
surface plasmons
Telecommunications and information theory
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Summary:By introducing periodic thickness modulation of thin metal stripes embedded in a dielectric, compact and efficient Bragg gratings for long-range surface plasmon polaritons (LR-SPPs) operating around 1550 nm are realized. Reflection and transmission spectra of the gratings having different lengths (from 20 to 160 /spl mu/m), heights (tens of nanometers), and widths of the metal ridges forming the grating were measured, and the reflectivity of up to 60% and bandwidths ranging from 5 to 40 nm are demonstrated. By using a simple lossless-uniform-grating description, the effective refractive-index modulation in LR-SPP gratings is estimated to be of the order of 10/sup -2/, and two different approaches for these calculations are compared. The LR-SPP loss incurred in the investigated gratings is also discussed.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2005.862470