Résumé:

Nanophotonics is an emerging field where researchers look for potential application of carbon nanotubes (SWNT) in the framework of silicon photonics technology, due to SWNT ability to emit, modulate and detect light in the wavelength range of silicon transparency. In this field of nanotube photonics, a first milestone was to couple light emission from SWNT into silicon waveguides [1]. Current researches focus on coupling SWNT with optical cavities, either for enhancing nanotube photoluminescence (PL) or nonlinear optical phenomena, at the nanoscale. Several works focused on the integration of carbon nanotubes with photonic cavities built on silicon-on-insulator (SOI) substrate, which is the preferential platform for photonic applications. Such work included coupling nanotubes with microdisk resonators[2], nanobeam cavity[3] or photonic crystal cavities[4]. However, these kinds of cavities could not be easily coupled to silicon waveguides, and were addressed using out-of-the-plane μ-PL configuration, hindering subsequent integration into more complex photonic devices. Building up on our previous work[5], we propose to couple carbon nanotube PL with silicon microring resonators in a fully integrated configuration, with an access waveguide[6]. PL coupled to microring mode could be collected from the access waveguide, with efficient rejection on non-resonant photons. Emission quality factor up to 8000 were observed. Moreover, this design allow for collinear excitation of SWNT through the access waveguide, leading to efficient excitation and collection of SWNT PL at different wavelength. Compare to previous designs, the requirement of an external laser source for out-of-the-plane SWNT excitation is lifted, underlining the pertinence of this approach for realistic carbon nanotube based photonic devices.