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A wavelength selective components utilizing channel plasmon polaritons (CPPs) and operating at telecom
wavelengths has been fabricated and investigated: a waveguide-ring resonator-based add-drop multiplexer (WRR-ADM) and a compact (3.75-μm-long) Bragg grating filter (BGF).
The CPP waveguides represent 0.5-μm-wide and 1.3-μm-deep V-grooves in gold, which are combined with a 5-μm-radius ring resonator (in
the WRR-ADM) or 0.5-μm-long wells milled with the period of 0.75 μm across a groove (in the BGF). The CPP-based components are characterized
in the wavelength range of 1425-1600 nm by use of near-field optical microscopy, exhibiting the wavelength selectivity of about 40 nm.
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