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The design, fabrication and characterization of
compact gradual bends for channel plasmon polaritons (CPPs) being excited
at telecom wavelengths is reported here. We obtain high-quality near-field optical images of
CPP modes propagating along a bent V-groove in gold, which indicate good
CPP mode confinement in the groove and efficient guiding around the
compact S-bend connecting two 5 μm-offset grooves over a distance of 5 μm.
Using averaged cross sections of the CPP intensity distributions before
and after the S-bend, the total bend loss is evaluated and found to be close to
2.3 dB for the wavelengths in the range of 1430-1640 nm.
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