Hostname: page-component-7b7567c8c-2n9c9 Total loading time: 0 Render date: 2026-11-15T06:33:55.172Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  16 March 2012

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.
Get access

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.

Information

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable