An important advancement towards optical communication on a chip would be the development of  integrable, nanoscale photonic emitters with tailored optical properties. Here we demonstrate the use of carbon nanotubes as electrically driven high-speed emitters in combination with a nanophotonic cavity which allows for exceptionally narrow linewidths [1].  The one-dimensional photonic crystal cavities are shown to spectrally select desired emission wavelengths, enhance intensity and efficiently couple light into the underlying photonic network with high reproducibility. Under pulsed voltage excitation we realize on-chip modulation rates in the GHz range, compatible with active photonic networks. Because the linewidth of the molecular emitter is determined by the quality factor of the photonic crystal, our approach effectively eliminates linewidth broadening due to temperature, surface interaction and hot-carrier injection.

This work was supported by the Volkswagen Foundation, by the Helmholtz Society through the program STN and the KNMF.

[1] Felix Pyatkov, Valentin Fütterling, Svetlana Khasminskaya, Benjamin Flavel, Frank Hennrich, Manfred M. Kappes, Ralph Krupke, and Wolfram H.P. Pernice, under review