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Light Splitting Function of Branched Chains of Microspheres Fabricated by Self-Assembly Process

Published online by Cambridge University Press:  16 March 2012

Tadashi Mitsui ,
Yutaka Wakayama ,
Tsunenobu Onodera ,
Takeru Hayashi ,
Naoki Ikeda ,
Yoshimasa Sugimoto ,
Tadashi Takamasu  and
Hidetoshi Oikawa
Tadashi Mitsui
Affiliation:
Surface Physics and Structure Unit, National Institute for Materials Science, Sakura 3-13, Tsukuba 305-0003, JAPAN.
Yutaka Wakayama
Affiliation:
Nano-Electronic Materials Unit, National Institute for Materials Science, Namiki 1-1, Tsukuba 305-0044, JAPAN.
Tsunenobu Onodera
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN.
Takeru Hayashi
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN.
Naoki Ikeda
Affiliation:
Nanotechnology Innovation Station, National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, JAPAN.
Yoshimasa Sugimoto
Affiliation:
Nanotechnology Innovation Station, National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, JAPAN.
Tadashi Takamasu
Affiliation:
Surface Physics and Structure Unit, National Institute for Materials Science, Sakura 3-13, Tsukuba 305-0003, JAPAN.
Hidetoshi Oikawa
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, JAPAN.
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Abstract

Using a self-assembly process, we fabricated ordered chains of transparent polystyrene microspheres that have 30°- and 60°-branched structures and that act as coupled-resonator optical waveguides (CROWs). We then observed the optical properties of propagation light through the CROWs. The light spectra were directly measured by guide-collection-mode near-field scanning optical microscopy (NSOM) techniques. The spectrum of light propagating to the 60°-branch shows some sharp peaks, which seem to be associated with whispering gallery modes (WGMs). On the other hand, the spectrum of light propagating to the 30°-branch shows rather broad peaks. Moreover, we observed the detailed structures of the CROWs by high-resolution scanning electron microscopy (HR-SEM), and performed a finite-difference time-domain (FDTD) simulation to explain the NSOM spectra. The results suggest that the microspheres’ branching chains themselves have a light-splitting function, which is a kind of wavelength-selective filter.

Keywords

self-assemblycolloidoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1392: Symposium K – Materials for High-Performance Photonics , 2012 , mrsf11-1392-k03-10
Copyright
Copyright © Materials Research Society 2012

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