Vertical input optical ring resonator with differential operation for optical sensor

Hideaki Okayama*, Motoki Miyazaki, Hirochika Nakajima

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    A novel waveguide ring resonator optical sensor with two resonant wavelength channels is proposed for a refractive index measurement of a test sample placed on the sensor substrate and its performance characteristics are investigated analytically and numerically. The waveguide device consists of a ring resonator, a split-ring-shaped loop waveguide, and a vertical input/output grating coupler, in which the loop waveguide acts as an additional resonator and provides another output wavelength channel of the sensor. The differential detection between the two wavelength channels enables the highly sensitive detection with temperature compensation. A numerical simulation based on a finite difference time domain (FDTD) method shows that a precise index change detection with a resolution of 10-6 can be achieved using of the proposed device.

    Original languageEnglish
    Pages (from-to)430-435
    Number of pages6
    JournalOptical Review
    Issue number6
    Publication statusPublished - 2011 Nov


    • grating
    • optical resonator
    • optical sensor
    • optical waveguide

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics


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