(Invited) sp3 Defects of Single Walled Carbon Nanotubes: Photonic and Electronic Integration

Abstract

Single walled carbon nanotubes with covalently functionalized sp3 defects have been rapidly emerging as a new class of transformational optical materials. Particularly, recent demonstration of room temperature, 1.55 µm single photon generation establish these covalent defects of SWCNTs as promising fundamental building blocks for defect driven quantum information technologies such as quantum key distribution. Defects also provide a significant boost in photoluminescence quantum yield (from <1% to ~28%) and emission stability, making envisioned applications of SWCNTs in optoelectronics, sensing, and imaging technologies more feasible. The key to full exploitation of these technological potentials lie in the ability to integrate these SWCNTs with defects into plasmonic/photonic cavities for enhancement of light matter interactions and into nano-electronic devices for electrical stimulation. Here in this talk I will report recent progresses we made together with our collaborators toward achieving this critical photonic and electronic integration. We have successfully integrated the SWCNTs with sp3 defects into 2D slab photonic crystals1 and metallo-dielectric antenna arrays.2 In case of coupling with 2D photonic crystal, we were able to demonstrate room temperature single photon generation with 3meV linewidth defined by the cavity quality factor and 50 fold enhancement in emission.1 We achieved narrowest low temperature emission linewidth of 35 µeV by coupling the defects with metallo-dielectric antennas.2 We were also successful in fabricating single SWCNT field effect transistors using dielectrophoresis and attained electroluminescence from the sp3 defects. Ishii, A.; He, X.; Hartmann, N. F.; Machiya, H.; Htoon, H.; Doorn, S. K.; Kato, Y. K. Enhanced Single-Photon Emission from Carbon-Nanotube Dopant States Coupled to Silicon Microcavities. Nano Lett. 18 , 3873-3878 (2018).Shayan, K.; He, X.; Luo, Y.; Rabut, C.; Li, X.; Hartmann, N.F.; Blackburn, J.L.; Doorn, S.K.; Htoon, H.; Strauf, S.; “Suppression of Pump-Induced Exciton Dephasing in Sidewall-Functionalized Single-Walled Carbon Nanotubes”, Nanoscale 10 , 12631 (2018).