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25 August 2017 Resonance modes in unbalanced Mach-Zehnder interferometers embedded in plasmonic waveguides
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We proposed an unbalanced Mach-Zehnder interferometer (MZI) by using Metal/Insulator/Metal PWGs for optical modulation or sensor devises. Transmission spectra of the MZI were calculated by Finite difference time domain method. We observed an interference pattern and transmission dips in calculated transmission spectra of an unbalanced MZI. An interference pattern is due to different path length of an unbalanced MZI. The Transmission dips are due to resonance in unbalanced MZI. Standing wave was appeared when the wavelength of the gap plasmon mode is equal to the integral multiple of PWG length of resonance area. Therefore, an unbalanced MZI in plasmonic waveguides serves as a ring resonator.
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Shun Kamada, Toshihiro Okamoto, and Masanobu Haraguchi "Resonance modes in unbalanced Mach-Zehnder interferometers embedded in plasmonic waveguides", Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034622 (25 August 2017);

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