An optical isolator is an important component of an optical network. At present, there is a significant commercial demand for an optical isolator, which can be integrated into the Photonic Integrated Circuits (PIC). A new design of an integrated optical isolator, which utilizes unique non-reciprocal properties of surface plasmons, has been proposed . The main obstacle for a practical realization of the proposed design is a substantial propagation loss of the surface plasmons in structures containing a ferromagnetic metal. The reduction of the propagation loss of a surface plasmon is the key to make the plasmonic isolator competitive with other designs of the integrated isolator.
We studied experimentally optical and magneto-optical properties of a Fe plasmonic waveguide integrated with an AlGaAs rib waveguides and a Co plasmonic waveguide integrated with Si nanowire waveguides. It was demonstrated experimentally that by utilizing a double-dielectric plasmonic waveguide it is possible to reduce significantly the optical loss in a plasmonic waveguide. For Fe/SiO2/AlGaAs double-dielectric plasmonic waveguide the low optical loss of 0.03 dB/um is obtained. As far as we know at present it is a lowest optical loss demonstrated for a plasmon propagating at a surface of a ferromagnetic metal. For Co/Ti2O3/SiO2 double-dielectric plasmonic waveguide integrated with a Si nanowire waveguide on a Si substrate the optical loss of 0.7 dB/um was demonstrated. The designs of the plasmonic isolator utilizing a ring resonator or a non-reciprocal coupler were studied.
 V. Zayets, H. Saito, S. Yuasa, and K. Ando,, Materials 5, 857 (2012).
Vadym Zayets, Hidekazu Saito, Koji Ando, and Shinji Yuasa, "Development of plasmonic isolator for integration into photonic integrated circuits (Presentation Recording)," Proc. SPIE 9551, Spintronics VIII, 955121 (Presented at SPIE Nanoscience + Engineering: August 13, 2015; Published: 5 October 2015); https://doi.org/10.1117/12.2187166.4519371059001.
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