81 citations · 348 across the 10 of their papers we have counts for
10 papers
Waveguide coupled cavity-enhanced light emission from individual carbon nanotubes
D. Yamashita, H. Machiya, K. Otsuka +2
We demonstrate an individual single-walled carbon nanotube light emitter integrated onto a microcavity and a waveguide operating in the telecom wavelength regime. Light emission fr…
Hexagonal boron nitride as an ideal substrate for carbon nanotube photonics
N. Fang, K. Otsuka, A. Ishii +4
Hexagonal boron nitride is widely used as a substrate for two-dimensional materials in both electronic and photonic devices. Here, we demonstrate that two-dimensional hexagonal bor…
Spectral tuning of optical coupling between air-mode nanobeam cavities and individual carbon nanotubes
H. Machiya, T. Uda, A. Ishii +1
We demonstrate control over optical coupling between air-suspended carbon nanotubes and air-mode nanobeam cavities by spectral tuning. Taking advantage of the large dielectric scre…
Single carbon nanotubes as ultrasmall all-optical memories
T. Uda, A. Ishii, Y. K. Kato
Performance improvements are expected from integration of photonic devices into information processing systems, and in particular, all-optical memories provide a key functionality.…
Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices
N. Higashide, M. Yoshida, T. Uda +2
Electroluminescence from individual carbon nanotubes within split-gate devices is investigated. By characterizing the air-suspended nanotubes with photoluminescence spectroscopy, c…
Exciton diffusion, end quenching, and exciton-exciton annihilation in individual air-suspended carbon nanotubes
A. Ishii, M. Yoshida, Y. K. Kato
Luminescence properties of carbon nanotubes are strongly affected by exciton diffusion, which plays an important role in various nonradiative decay processes. Here we perform photo…
Gate-controlled generation of optical pulse trains using individual carbon nanotubes
M. Jiang, Y. Kumamoto, A. Ishii +3
We report on optical pulse-train generation from individual air-suspended carbon nanotubes under an application of square-wave gate voltages. Electrostatically-induced carrier accu…
Stark effect of excitons in individual air-suspended carbon nanotubes
M. Yoshida, Y. Kumamoto, A. Ishii +2
We investigate electric-field induced redshifts of photoluminescence from individual single-walled carbon nanotubes. The shifts scale quadratically with field, while measurements w…
Giant circular dichroism in individual carbon nanotubes induced by extrinsic chirality
A. Yokoyama, M. Yoshida, A. Ishii +1
Circular dichroism is widely used for characterizing organic and biological materials, but measurements at a single molecule level are challenging because differences in absorption…
Spontaneous exciton dissociation in carbon nanotubes
Y. Kumamoto, M. Yoshida, A. Ishii +3
Simultaneous photoluminescence and photocurrent measurements on individual single-walled carbon nanotubes reveal spontaneous dissociation of excitons into free electron-hole pairs.…