(Invited) Exciton Dynamics in Air-Suspended Carbon Nanotubes Coupled to Nanobeam Cavities

Air modes in photonic crystal nanobeam cavities offer efficient coupling to air-suspended carbon nanotubes [1,2]. Here we investigate exciton dynamics in the time domain at room temperature. The cavities are fabricated from silicon-on-insulator wafers, and nanotubes are synthesized over the cavities by chemical vapor deposition. Time-resolved photoluminescence measurements are performed on individual nanotubes, and we compare the bright exciton lifetime with and without coupling to the cavity. Purcell enhancement of the exciton recombination is observed [3]. Work supported in part by MIC (SCOPE 191503001), RIKEN (Incentive Research Projects), JSPS (KAKENHI JP16H05962), and MEXT (Nanotechnology Platform). H.M. is supported by JSPS Research Fellowship. We thank the Advanced Manufacturing Support Team at RIKEN for technical assistance. [1] R. Miura, S. Imamura, R. Ohta, A. Ishii, X. Liu, T. Shimada, S. Iwamoto, Y. Arakawa, Y. K. Kato, Nat. Commun. 5, 5580 (2014). [2] H. Machiya, T. Uda, A. Ishii, Y. K. Kato, Appl. Phys. Lett. 112, 021101 (2018). [3] H. Machiya, A. Ishii, Y. K. Kato, in preparation.