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Schematic layout of LRSPP-based (a) MZIM and (b) DCS. (c) Optical microscope image of the fabricated MZIM showing stripes with typical bends (curvature radius to ensure low bend loss), 100-nm-thick contact pads and connecting electrodes. (d) Magnified image of the MZIM part containing an isolating 10-μm-long break in the waveguide stripe and a part of thick electrode connected with 20-μm-long (15-nm-thin) stripe to the waveguide.
Dynamic characteristics of the MZIM. Inset shows the temporal response of the MZIM measured with an offset of 2 V and a peak-to-peak voltage of 3.8 V (the electrode resistance was ). Fitting exponential dependencies to the rise and fall of the MZIM output power give a response time constant of .
Switching characteristics of the DCS. Without applied electrical current, the optical radiation is efficiently tunneled from the direct arm excited at the DCS input into the coupled arm. Insets show microscope images of the intensity distributions at the output facet of the DCS (waveguide separation is 127 μm) for different values of the applied electrical power.
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