Fiber-Coupled Surface Plasmon Polariton Excitation in Imprinted Dielectric-Loaded Waveguides

Figure 4

Images from the near infrared camera showing a top-down view of the sample centered on the DLSPPW part of the waveguide. Left side is the incoupling, right side is the outcoupling. (a) 0^∘ Polarization (b) 45^∘ Polarization (c) 90^∘ Polarization. While the incoupling spot stays bright, the outcoupling spot rapidly decreases in intensity, showing that the plasmonic mode is suppressed with changing polarization. (d) Optical microscope image of waveguide showing gold stripe and DLSPPW section shown for comparison. (e) SEM image (same scale as optical images) showing the transition from plasmonic to optical waveguide at an angle of 45^∘.

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