Photonic-crystal resonant effect using self-assembly ordered structures in magnetic fluid films under external magnetic fields

Shieh-Yueh Yang, Herng-Er Horng, Y. T. Shiao, Chin Yih Hong, Hong-Chang Yang

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    When an external magnetic field is applied perpendicularly to a magnetic fluid film, a self-assembly hexagonal ordered structure is formed in the film when the field exceeds a certain strength. The period of the ordered structure can be manipulated from several micrometers down to sub-micrometers by increasing the field strength or reducing the film thickness. By injecting a light propagating along the in-plane direction of the film, photonic-crystal band gaps can be observed. With the tunability of the ordered structure, the forbidden photonic bands can be adjusted by varying the external field strength. It was further found that resonant modes are generated when a point defect is artificially implanted into the self-assembly ordered structure in the magnetic fluid film. These results reveal that the self-assembly ordered structure in a magnetic fluid film under external magnetic fields acts as a photonic crystal.

    Original languageEnglish
    Pages (from-to)43-47
    Number of pages5
    JournalJournal of Magnetism and Magnetic Materials
    Volume307
    Issue number1
    DOIs
    Publication statusPublished - 2006 Dec 1

    Keywords

    • Magnetic fluids
    • Photonic crystals
    • Resonant modes

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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