Near-unity radiative quantum efficiency of excitons in carbon nanotubes

Abstract

The efficiencies of photonic devices are primarily governed by radiative quantum efficiency, which is a property given by the light emitting material. Quantitative characterization for carbon nanotubes, however, has been difficult despite being a prominent material for nanoscale photonics. Here we determine the radiative quantum efficiency of bright excitons in carbon nanotubes by modifying the exciton dynamics through cavity quantum electrodynamical effects. Silicon photonic crystal nanobeam cavities are used to induce the Purcell effect on individual carbon nanotubes. Spectral and temporal behavior of the cavity enhancement is characterized by photoluminescence microscopy, and the fraction of the radiative decay process is evaluated. We find that the radiative quantum efficiency is near unity for bright excitons in carbon nanotubes at room temperature.

arXiv comment7 pages, 5 figures

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Cited by in corpus (5)

• Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes
• Hybrid silicon all-optical switching devices integrated with two-dimensional material
• Intrinsic process for upconversion photoluminescence via $K$-momentum phonon coupling in carbon nanotubes
• Trion transfer in mixed-dimensional heterostructures
• Dielectric environment engineering via 2D material heterostructure formation on hybrid photonic crystal nanocavity