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Analysis of Optical Resonator with Waveguide Discontinuities Constructed by Two-Dimensional MDM Plasmonic Waveguide

IEICE TRANSACTIONS ON ELECTRONICS 2025年第4期E108C卷 195-200页

作者： Naka, Yoshihiro Nishimoto, Masahiko Yokota, Mitsuhiro Univ Miyazaki Miyazaki 8892192 Japan Kumamoto Univ Kumamoto 8608555 Japan

An optical resonator with two waveguide discontinuities constructed by a metal-dielectric-metal plasmonic waveguide has been analyzed using the finite-difference time-domain (FD-TD) method with the piecewise linear recursive convolution (plrc) method. The waveguide discontinuity has been expressed as an equivalent transmission line circuit whose circuit parameters are estimated from the reflection coefficients analyzed by the FD-TD method. We have confirmed the validity of the circuit configuration because the reflection characteristics of the equivalent circuit with the circuit parameters agree with those of the FD-TD method. Next, we have analyzed a resonator structure with two waveguide discontinuities and shown that the equivalent circuit gives a good approximation for the structure with a large difference in waveguide width at the discontinuities, in which conventional equivalent circuits had large errors.

关键词： plasmonic waveguide resonator waveguide discontinuity transmission line circuit FD-TD method plrc method

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Analysis of Optical Power Splitter with Resonator Structure Constructed Two-Dimensional MDM Plasmonic

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IEICE TRANSACTIONS ON ELECTRONICS 2024年第5期E107C卷 141-145页

作者： Naka, Yoshihiro Nishimoto, Masahiko Yokota, Mitsuhiro Univ Miyazaki Miyazaki 8892192 Japan Kumamoto Univ Kumamoto 8608555 Japan

An efficient optical power splitter constructed by a metaldielectric -metal plasmonic waveguide with a resonator structure has been analyzed. The method of solution is the finite difference time domain (FD -TD) method with the piecewise linear recursive convolution (plrc) method. The resonator structure consists of input/output waveguides and a narrow waveguide with a T -junction. The power splitter with the resonator structure is expressed by an equivalent transmission -line circuit. We can find that the transmittance and reflectance calculated by the FD -TD method and the equivalent circuit are matched when the difference in width between the input/output waveguides and the narrow waveguide is small. It is also shown that the transmission wavelength can be adjusted by changing the narrow waveguide lengths that satisfy the impedance matching condition in the equivalent circuit.

关键词： plasmonic waveguide optical power splitter optical resonator FD-TD method plrc method transmission-line circuit

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Analysis of Optical Resonator Constructed by Two-Dimensional MDM Plasmonic Waveguide

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IEICE TRANSACTIONS ON ELECTRONICS 2023年第3期E106C卷 103-106页

作者： Naka, Yoshihiro Nishimoto, Masahiko Yokota, Mitsuhiro Univ Miyazaki Miyazaki 8892192 Japan Kumamoto Univ Kumamoto 8608555 Japan

An efficient bent waveguide and an optical power splitter with a resonator constructed by a metal-dielectric-metal plasmonic wave -guide have been analyzed. The method of solution is the finite differ-ence time domain (FD-TD) method with the piecewise linear recursive convolution (plrc) method. The resonator can be realized by utilizing impedance mismatch at the connection between a narrow waveguide and an input/output waveguide. Numerical results for the bent waveguide show that transmission bands can be controlled by adjusting the length of the nar-row waveguide. We have also shown that the optical power of the power splitter is entirely distributed into the output waveguide at the resonant wavelength and its distribution ratio can be controlled.

关键词： plasmonic waveguide bent waveguide optical power splitter resonator FD-TD method plrc method

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