Abstract
We consider wavelength-selective splitting of radiation using directional couplers (DCs) formed by dielectric-loaded surface-plasmon-polariton waveguides (DLSPPWs). The DCs were fabricated by depositing sub-wavelength-sized polymer ridges on a gold film using large-scale UV photolithography and characterized at telecommunications wavelengths with near-field microscopy. We demonstrate a DLSPPW-based -long DC comprising offset S bends and -long parallel waveguides that changes from the “through” state at splitting at , and show that a -long DC should enable complete separation of the radiation channels at 1400 and . The DC performance is found to be in good agreement with full vectorial three-dimensional finite-element simulations.
© 2009 Optical Society of America
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