Molecular Ordering in Self-Organized Dye Particles--Near-Field and Polarized Evanescent-Field Fluorescence Study--

Shinji KINOSHITA; Akihiro TOMIOKA; Atsushi FUJIMOTO; Yasuaki ITAKURA

doi:10.1093/ietele/e89-c.12.1735

Molecular Ordering in Self-Organized Dye Particles--Near-Field and Polarized Evanescent-Field Fluorescence Study--

Shinji KINOSHITA, Akihiro TOMIOKA, Atsushi FUJIMOTO, Yasuaki ITAKURA

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Self-organized organic dye particles of micrometer and submicrometer size were prepared by utilizing a wetting/dewetting process of polar solvent on a hydrophilic glass substrate. The near-field scanning optical microscopy successfully identified near-field excited near-field fluorescence from single particles, however, the majority of the small particles with diameters around 2 µm or less did not show fluorescence under near-field observation. In contrast, far-field fluorescence, when excited by a polarized evanescent field, was observed, with the intensity depending on the excitation polarization, indicating that molecules' transition moment within dye particles was oriented parallel to the substrate surface. Single particle fluorescence spectrum consistently showed an identical sharp peak with a large redshift, indicating that the particles were composed of identical dye aggregates similar to J-aggregates. These observations suggest that the near-field at the probe tip was polarized parallel to the probe axis. Another observation, that molecules were oriented in a similar direction among adjacent particles, suggests that the dewetting process contributed to the alignment of the molecular orientation among adjacent particles, which further proves that the present specimen was formed by a self-organizing mechanism.

Publication: IEICE TRANSACTIONS on Electronics Vol.E89-C No.12 pp.1735-1740

Publication Date: 2006/12/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1093/ietele/e89-c.12.1735

Type of Manuscript: Special Section PAPER (Special Section on Towards the Realization of Organic Molecular Electronics)

Category: Evaluation of Organic Materials

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Shinji KINOSHITA, Akihiro TOMIOKA, Atsushi FUJIMOTO, Yasuaki ITAKURA, "Molecular Ordering in Self-Organized Dye Particles--Near-Field and Polarized Evanescent-Field Fluorescence Study--" in IEICE TRANSACTIONS on Electronics, vol. E89-C, no. 12, pp. 1735-1740, December 2006, doi: 10.1093/ietele/e89-c.12.1735.
Abstract: Self-organized organic dye particles of micrometer and submicrometer size were prepared by utilizing a wetting/dewetting process of polar solvent on a hydrophilic glass substrate. The near-field scanning optical microscopy successfully identified near-field excited near-field fluorescence from single particles, however, the majority of the small particles with diameters around 2 µm or less did not show fluorescence under near-field observation. In contrast, far-field fluorescence, when excited by a polarized evanescent field, was observed, with the intensity depending on the excitation polarization, indicating that molecules' transition moment within dye particles was oriented parallel to the substrate surface. Single particle fluorescence spectrum consistently showed an identical sharp peak with a large redshift, indicating that the particles were composed of identical dye aggregates similar to J-aggregates. These observations suggest that the near-field at the probe tip was polarized parallel to the probe axis. Another observation, that molecules were oriented in a similar direction among adjacent particles, suggests that the dewetting process contributed to the alignment of the molecular orientation among adjacent particles, which further proves that the present specimen was formed by a self-organizing mechanism.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e89-c.12.1735/_p

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@ARTICLE{e89-c_12_1735,
author={Shinji KINOSHITA, Akihiro TOMIOKA, Atsushi FUJIMOTO, Yasuaki ITAKURA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Molecular Ordering in Self-Organized Dye Particles--Near-Field and Polarized Evanescent-Field Fluorescence Study--},
year={2006},
volume={E89-C},
number={12},
pages={1735-1740},
abstract={Self-organized organic dye particles of micrometer and submicrometer size were prepared by utilizing a wetting/dewetting process of polar solvent on a hydrophilic glass substrate. The near-field scanning optical microscopy successfully identified near-field excited near-field fluorescence from single particles, however, the majority of the small particles with diameters around 2 µm or less did not show fluorescence under near-field observation. In contrast, far-field fluorescence, when excited by a polarized evanescent field, was observed, with the intensity depending on the excitation polarization, indicating that molecules' transition moment within dye particles was oriented parallel to the substrate surface. Single particle fluorescence spectrum consistently showed an identical sharp peak with a large redshift, indicating that the particles were composed of identical dye aggregates similar to J-aggregates. These observations suggest that the near-field at the probe tip was polarized parallel to the probe axis. Another observation, that molecules were oriented in a similar direction among adjacent particles, suggests that the dewetting process contributed to the alignment of the molecular orientation among adjacent particles, which further proves that the present specimen was formed by a self-organizing mechanism.},
keywords={},
doi={10.1093/ietele/e89-c.12.1735},
ISSN={1745-1353},
month={December},}

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TY - JOUR
TI - Molecular Ordering in Self-Organized Dye Particles--Near-Field and Polarized Evanescent-Field Fluorescence Study--
T2 - IEICE TRANSACTIONS on Electronics
SP - 1735
EP - 1740
AU - Shinji KINOSHITA
AU - Akihiro TOMIOKA
AU - Atsushi FUJIMOTO
AU - Yasuaki ITAKURA
PY - 2006
DO - 10.1093/ietele/e89-c.12.1735
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E89-C
IS - 12
JA - IEICE TRANSACTIONS on Electronics
Y1 - December 2006
AB - Self-organized organic dye particles of micrometer and submicrometer size were prepared by utilizing a wetting/dewetting process of polar solvent on a hydrophilic glass substrate. The near-field scanning optical microscopy successfully identified near-field excited near-field fluorescence from single particles, however, the majority of the small particles with diameters around 2 µm or less did not show fluorescence under near-field observation. In contrast, far-field fluorescence, when excited by a polarized evanescent field, was observed, with the intensity depending on the excitation polarization, indicating that molecules' transition moment within dye particles was oriented parallel to the substrate surface. Single particle fluorescence spectrum consistently showed an identical sharp peak with a large redshift, indicating that the particles were composed of identical dye aggregates similar to J-aggregates. These observations suggest that the near-field at the probe tip was polarized parallel to the probe axis. Another observation, that molecules were oriented in a similar direction among adjacent particles, suggests that the dewetting process contributed to the alignment of the molecular orientation among adjacent particles, which further proves that the present specimen was formed by a self-organizing mechanism.
ER -