11 September 2006 Long-range surface plasmon polariton waveguides with TE and TM guiding
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Long-range surface plasmon polariton (LRSPP) waveguides supporting both TE and TM polarized light are demonstrated experimentally. The waveguides consist of metallic nanowires with approximately 150-nm square cross sections embedded in a polymer matrix. The wavelength dependence of propagation loss and coupling loss to single mode fibers is presented. At wavelengths around 1550 nm, the nanowires exhibit a propagation loss around 4.0 dB/cm for the TM mode and 4.5 dB/cm for the TE mode. The mode field is close to symmetric and suitable for coupling to and from optical fibers. A small increase in the waveguide width, resulting in a deviation from a square cross section, is sufficient to extinguish the TE mode, making asymmetric nanowire waveguides similar to the more conventional LRSPP thin stripe waveguides. Finally, we demonstrate a compact thermo-optical variable optical attenuator based on a LRSPP nanowire waveguide.
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K. Leosson, A. Boltasseva, T. Nikolajsen, S. I. Bozhevolnyi, "Long-range surface plasmon polariton waveguides with TE and TM guiding", Proc. SPIE 6324, Plasmonics: Nanoimaging, Nanofabrication, and their Applications II, 632404 (11 September 2006); doi: 10.1117/12.678481; https://doi.org/10.1117/12.678481

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