We propose and theoretically verify an efficient mechanism of broadband coupling between incident light and on-chip dielectric slot waveguide by employing a tapered plasmonic nanoantenna. The nanoantenna receives free space radiation and couples it to a dielectric slot waveguide with the efficiency of up to 20% in a broad spectral range, having a small footprint as compared with the currently used narrowband dielectric grating couplers. We argue that the frequency selective properties of such nanoantennas also allow for using them as ultrasmall on-chip multiplexer/demultiplexer devices. © 2013 Optical Society of America.
Maksymov, I., & Kivshar, Y. S. (2013). Broadband light coupling to dielectric slot waveguides with tapered plasmonic nanoantennas. Optics Letters, 38(22), 4853-4856. https://doi.org/10.1364/OL.38.004853