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
Naoya Tate, Makoto Naruse, Yang Liu, Tadashi Kawazoe, Takashi Yatsui, Motoichi Ohtsu
Experimental demonstration and stochastic modeling of autonomous formation of nanophotonic droplets Journal Article
In: Applied Physics B, vol. 112, no. 4, pp. 587-592, 2013.
Abstract | Links | BibTeX | Tags: Droplet, Nanophotonic fabrication, Near-field effect
@article{2013tateAPB3,
title = {Experimental demonstration and stochastic modeling of autonomous formation of nanophotonic droplets},
author = {Naoya Tate and Makoto Naruse and Yang Liu and Tadashi Kawazoe and Takashi Yatsui and Motoichi Ohtsu},
doi = {10.1007/s00340-013-5442-1},
year = {2013},
date = {2013-09-01},
journal = {Applied Physics B},
volume = {112},
number = {4},
pages = {587-592},
publisher = {Springer Nature},
abstract = {We have previously demonstrated a novel technique for autonomously forming a nanophotonic droplet, which is micro-scale spherical polymer structure that contains paired heterogeneous nanometric components. The sort-selectivity and alignment accuracy of the nanometric components in each nanophotonic droplet, and the related homogeneity of the optical function, are due to a characteristic pairing process based on a phonon-assisted photo-curing method. The proposed method requires irradiating a mixture of components with light to induce optical near-field interactions between each component, and subsequent processes based on these interactions. The pairing yield of components via the interactions is considered to mainly depend on the frequency of their encounters and the size-resonance effect between encountered components. In this paper, we model these two factors by individual stochastic procedures and construct a numerical model to describe the pairing process. Agreement between the results of numerical and experimental demonstrations shows the validity of our stochastic modeling.},
keywords = {Droplet, Nanophotonic fabrication, Near-field effect},
pubstate = {published},
tppubtype = {article}
}
We have previously demonstrated a novel technique for autonomously forming a nanophotonic droplet, which is micro-scale spherical polymer structure that contains paired heterogeneous nanometric components. The sort-selectivity and alignment accuracy of the nanometric components in each nanophotonic droplet, and the related homogeneity of the optical function, are due to a characteristic pairing process based on a phonon-assisted photo-curing method. The proposed method requires irradiating a mixture of components with light to induce optical near-field interactions between each component, and subsequent processes based on these interactions. The pairing yield of components via the interactions is considered to mainly depend on the frequency of their encounters and the size-resonance effect between encountered components. In this paper, we model these two factors by individual stochastic procedures and construct a numerical model to describe the pairing process. Agreement between the results of numerical and experimental demonstrations shows the validity of our stochastic modeling.
Naoya Tate, Yang Liu, Tadashi Kawazoe, Makoto Naruse, Takashi Yatsui, Motoichi Ohtsu
Nanophotonic droplet: a nanometric optical device consisting of size- and number-selective coupled quantum dots Journal Article
In: Applied Physics B, vol. 110, no. 3, pp. 293-297, 2013.
Abstract | Links | BibTeX | Tags: Droplet, Nanophotonic fabrication
@article{2013tateAPB2,
title = {Nanophotonic droplet: a nanometric optical device consisting of size- and number-selective coupled quantum dots},
author = {Naoya Tate and Yang Liu and Tadashi Kawazoe and Makoto Naruse and Takashi Yatsui and Motoichi Ohtsu},
doi = {10.1007/s00340-012-5285-1},
year = {2013},
date = {2013-03-01},
journal = {Applied Physics B},
volume = {110},
number = {3},
pages = {293-297},
publisher = {Springer Nature},
abstract = {Although recent advances in fabrication technologies have allowed the realization of highly accurate nanometric devices and systems, most approaches still lack uniformity and mass-production capability sufficient for practical use. We have previously demonstrated a novel technique for autonomously coupling heterogeneous quantum dots to induce particular optical responses based on a simple phonon-assisted photocuring method in which a mixture of quantum dots and photocurable polymer is irradiated with light. The cured polymer sequentially encapsulates coupled quantum dots, forming what we call a nanophotonic droplet. Recently, we found that each quantum dot in the mixture is preferably coupled with other quantum dots of similar size due to a size resonance effect of the optical near-field interactions between them. Moreover, every nanophotonic droplet is likely to contain the same number of coupled quantum dots. In this paper, we describe the basic mechanisms of autonomously fabricating nanophotonic droplets, and we examine the size- and number-selectivity of the quantum dots during their coupling process. The results from experiments show the uniformity of the optical properties of mass-produced nanophotonic droplets, revealed by emission from the contained coupled quantum dots, due to the fundamental characteristics of our method.},
keywords = {Droplet, Nanophotonic fabrication},
pubstate = {published},
tppubtype = {article}
}
Although recent advances in fabrication technologies have allowed the realization of highly accurate nanometric devices and systems, most approaches still lack uniformity and mass-production capability sufficient for practical use. We have previously demonstrated a novel technique for autonomously coupling heterogeneous quantum dots to induce particular optical responses based on a simple phonon-assisted photocuring method in which a mixture of quantum dots and photocurable polymer is irradiated with light. The cured polymer sequentially encapsulates coupled quantum dots, forming what we call a nanophotonic droplet. Recently, we found that each quantum dot in the mixture is preferably coupled with other quantum dots of similar size due to a size resonance effect of the optical near-field interactions between them. Moreover, every nanophotonic droplet is likely to contain the same number of coupled quantum dots. In this paper, we describe the basic mechanisms of autonomously fabricating nanophotonic droplets, and we examine the size- and number-selectivity of the quantum dots during their coupling process. The results from experiments show the uniformity of the optical properties of mass-produced nanophotonic droplets, revealed by emission from the contained coupled quantum dots, due to the fundamental characteristics of our method.
Naoya Tate, Yang Liu, Tadashi Kawazoe, Makoto Naruse, Takashi Yatsui, Motoichi Ohtsu
Fixed-distance coupling and encapsulation of heterogeneous quantum dots using phonon-assisted photo-curing Journal Article
In: Applied Physics B, vol. 110, no. 1, pp. 39-45, 2013.
Abstract | Links | BibTeX | Tags: Droplet, Nanophotonic fabrication
@article{2013tateAPB1,
title = {Fixed-distance coupling and encapsulation of heterogeneous quantum dots using phonon-assisted photo-curing},
author = {Naoya Tate and Yang Liu and Tadashi Kawazoe and Makoto Naruse and Takashi Yatsui and Motoichi Ohtsu},
doi = {10.1007/s00340-012-5249-5},
year = {2013},
date = {2013-01-01},
journal = {Applied Physics B},
volume = {110},
number = {1},
pages = {39-45},
publisher = {Springer Nature},
abstract = {We propose a novel method of coupling heterogeneous quantum dots at fixed distances and capsulating the coupled quantum dots by utilizing nanometric local curing of a photo-curable polymer caused by multistep electronic transitions based on a phonon-assisted optical near-field process between quantum dots. Because the coupling and the capsulating processes are triggered only when heterogeneous quantum dots floating in a solution closely approach each other to induce optical near-field interactions between them, the distances between the coupled quantum dots are physically guaranteed to be equal to the scale of the optical near fields. To experimentally verify our idea, we fabricated coupled quantum dots, consisting of CdSe and ZnO quantum dots and a UV-curable polymer. We also measured the photoluminescence properties due to the quantum-dot coupling and showed that the individual photoluminescences from the CdSe and ZnO quantum dots exhibited a trade-off relationship.},
keywords = {Droplet, Nanophotonic fabrication},
pubstate = {published},
tppubtype = {article}
}
We propose a novel method of coupling heterogeneous quantum dots at fixed distances and capsulating the coupled quantum dots by utilizing nanometric local curing of a photo-curable polymer caused by multistep electronic transitions based on a phonon-assisted optical near-field process between quantum dots. Because the coupling and the capsulating processes are triggered only when heterogeneous quantum dots floating in a solution closely approach each other to induce optical near-field interactions between them, the distances between the coupled quantum dots are physically guaranteed to be equal to the scale of the optical near fields. To experimentally verify our idea, we fabricated coupled quantum dots, consisting of CdSe and ZnO quantum dots and a UV-curable polymer. We also measured the photoluminescence properties due to the quantum-dot coupling and showed that the individual photoluminescences from the CdSe and ZnO quantum dots exhibited a trade-off relationship.