Publications
ResearcherID : C-5956-2008 (TY, h-index: 24) , AAZ-8749-2021 (RK, h-index: 11)
Google Scholar : TY (h-index: 33), RK (h-index: 11)
2013
Takashi Yatsui, Kazaunori Iijima, Tsubasa Imoto, Kokoro Kitamura, Tadashi Kawazoe
Phonon-assisted near-field activation of electron transfer Journal Article
In: Journal of Nanophotonics, vol. 7, no. 1, pp. 1 – 8, 2013.
Abstract | Links | BibTeX | Tags: Absorption, Electrodes, First, Nanostructuring, Non-uniform optical near field, Platinum, sapphire
@article{10.1117/1.JNP.7.073796,
title = {Phonon-assisted near-field activation of electron transfer},
author = {Takashi Yatsui and Kazaunori Iijima and Tsubasa Imoto and Kokoro Kitamura and Tadashi Kawazoe},
doi = {10.1117/1.JNP.7.073796},
year = {2013},
date = {2013-09-01},
journal = {Journal of Nanophotonics},
volume = {7},
number = {1},
pages = {1 -- 8},
publisher = {SPIE},
abstract = {An optical near field should promote phonon-assisted multiple excitation in nanoscale structures. With the phonon-assisted process, greater catalytic activity is expected without heating. To confirm this effect, photo-induced current generation using platinum black electrodes in ferricyanide solution (an absorption band-edge wavelength of 470 nm) under visible light irradiation continuous wave [(CW), λ=532 nm ] was observed. Higher order dependence of the generated current density on the incident light power was observed, indicating two-step activation of electron transfer, which originated from the phonon-assisted near-field effect on the nanostructured surface of the electrode.},
keywords = {Absorption, Electrodes, First, Nanostructuring, Non-uniform optical near field, Platinum, sapphire},
pubstate = {published},
tppubtype = {article}
}
An optical near field should promote phonon-assisted multiple excitation in nanoscale structures. With the phonon-assisted process, greater catalytic activity is expected without heating. To confirm this effect, photo-induced current generation using platinum black electrodes in ferricyanide solution (an absorption band-edge wavelength of 470 nm) under visible light irradiation continuous wave [(CW), λ=532 nm ] was observed. Higher order dependence of the generated current density on the incident light power was observed, indicating two-step activation of electron transfer, which originated from the phonon-assisted near-field effect on the nanostructured surface of the electrode.
2008
Takashi Yatsui, Hyung Su Jeong, Motoichi Ohtsu
Controlling the energy transfer between near-field optically coupled ZnO quantum dots Journal Article
In: Applied Physics B, vol. 93, no. 1, pp. 199-202, 2008.
Abstract | Links | BibTeX | Tags: Electrodes, First, QD, ZnO
@article{2008yatsuiAPBZnO,
title = {Controlling the energy transfer between near-field optically coupled ZnO quantum dots},
author = {Takashi Yatsui and Hyung Su Jeong and Motoichi Ohtsu},
doi = {10.1007/s00340-008-3154-8},
year = {2008},
date = {2008-10-01},
journal = {Applied Physics B},
volume = {93},
number = {1},
pages = {199-202},
publisher = {Springer Nature},
abstract = {We performed time-resolved spectroscopy of ZnO quantum dots (QD), and observed exciton energy transfer and dissipation between QD via an optical near-field interaction. Two different sizes of ZnO QD with resonant energy levels were mixed to test the energy transfer and dissipation using time-resolved photoluminescence spectroscopy. The estimated energy transfer time was 144 ps. Furthermore, we demonstrated that the ratio of energy transfer between the resonant energy states could be controlled.},
keywords = {Electrodes, First, QD, ZnO},
pubstate = {published},
tppubtype = {article}
}
We performed time-resolved spectroscopy of ZnO quantum dots (QD), and observed exciton energy transfer and dissipation between QD via an optical near-field interaction. Two different sizes of ZnO QD with resonant energy levels were mixed to test the energy transfer and dissipation using time-resolved photoluminescence spectroscopy. The estimated energy transfer time was 144 ps. Furthermore, we demonstrated that the ratio of energy transfer between the resonant energy states could be controlled.