We review some of the recent advances in the development of subwavelength plasmonic devices for manipulating light at the nanoscale, drawing examples from our own work in metal-dielectric-metal (MDM) plasmonic waveguide devices.We introduce bends, splitters, and mode converters for MDM waveguides with no additional loss.We also demonstrate that optical gain provides a mechanism for on/off switching in MDM plasmonic waveguides.Highly efficient compact couplers between dielectric waveguides and MDM waveguides are also introduced.
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Veronis et al. (2009) studied this question.