Light splitting function of branched chains of microspheres fabricated by self-assembly process

Tadashi Mitsui, Yutaka Wakayama, Tsunenobu Onodera, Takeru Hayashi, Naoki Ikeda, Yoshimasa Sugimoto, Tadashi Takamasu, Hidetoshi Oikawa

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationMaterials for High-Performance Photonics
Number of pages6
Publication statusPublished - 2011
Event2011 MRS Fall Meeting - Boston, MA, United States
Duration: 2011 Nov 282011 Dec 2

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Conference2011 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA


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