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An ultra-compact plasmonic electro-optical (EO) switch based on a silver-insulator-silver bus waveguide coupled to two nanocavity reflectors and two drop cavities is introduced. All cavities are filled with 4-dimethylamino-N-methyl-4-stilbazolium tosylate as an EO material. Finite difference time domain (FDTD) method and coupled-mode-theory (CMT) approaches are used to numerically and theoretically investigate the properties of the device. Results reveal that the proposed device can work properly as 1× 1 and 1× 2 switches. By inserting nanocavity reflectors, one can improve the performance of the switches. Results are shown for switches with single and double nanocavity reflectors operating at 984 nm and 1560 nm, respectively. A transmission of 0.83 (0.77) and modulation depth of 31.41 dB (17.72 dB) at the wavelength of 1560 nm (984 nm) could be obtained. The proposed device has potential …