A frequency-selective circulator via mode coupling between surface waveguide and resonators

A. Q. Liu*, E. H. Khoo, T. H. Cheng, E. P. Li, Jingqi Li

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    10 Scopus citations


    In this letter, a frequency-selective circulator via mode coupling between a circular photonic crystal (CPC) surface waveguide and resonator systems is developed. The curve surface waveguide is formed by reducing the outermost rods radii. It has a transmission efficiency of 95% when the surface concentric distance is reduced by half. The resonator system, which consists of rod(s) are placed at each of the CPC perpendicular axis. Using optimized resonator physical parameters, selected frequencies are dropped at different locations with efficiency of 97%. It is suggested that several circulators can be cascaded to build a large scale frequency-selective multiplexing system.

    Original languageEnglish (US)
    Article number021119
    JournalApplied Physics Letters
    Issue number2
    StatePublished - Jan 28 2008

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this