Figure 1
From: Plasmonic-multimode-interference-based logic circuit with simple phase adjustment
Plasmonic logic circuit using the MMI structure.
(a) Schematic illustration of an MMI-based plasmonic half adder, composed of 1 × 1 MMI phase adjusters and 2 × 2 MMI intensity modulators. Radiation output, which suppresses radiation loss caused by opposite phase interference in the case of single-mode-waveguide-based logic, is abbreviated as Rad. (b) Numerical simulation results of the optical field distribution on a plasmonic phase adjuster. Here, the width, height and length of the phase adjuster were 900 nm, 500 nm and 1900 nm, respectively and the width of the single-mode waveguide was 400 nm. (c) Numerical simulation results of the optical field distribution at the 2 × 2 MMI intensity modulator, where the plasmonic signals were input with no phase difference. (d) Optical field distribution when the input phase difference was set to π/2. The width and length of the 2 × 2 MMI intensity modulator were set to 2800 nm and 7000 nm, respectively. These structures have the potential to be further minimized using gap plasmons.
