Widely tunable single-photon source from a carbon nanotube in the Purcell regime
arXiv:1508.06297 · doi:10.1103/PhysRevLett.116.247402
Abstract
Single-Wall Carbon Nanotubes (SWNTs) are among the very few candidates for single-photon sources operating in the telecom bands since they exhibit large photon antibunching up to room temperature. However, coupling a nanotube to a photonic structure is highly challenging because of the random location and emission wavelength in the growth process. Here, we demonstrate the realization of a widely tunable single-photon source by using a carbon nanotube inserted in an original repositionable fiber micro-cavity : we fully characterize the emitter in the free-space and subsequently form the cavity around the nanotube. This brings an invaluable insight into the emergence of quantum electrodynamical effects. We observe an efficient funneling of the emission into the cavity mode with a strong sub-Poissonian statistics together with an up to 6-fold Purcell enhancement factor. By exploiting the cavity feeding effect on the phonon wings, we locked the single-photon emission at the cavity frequency over a 4~THz-wide band while keeping the mode width below 80~GHz. This paves the way to multiplexing and multiple qubit coupling.
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