The performance of plasmonic nanoantenna structures on top of SOI wirewaveguides as coherent perfect absorbers for modulators and all-opticalswitches is explored. The absorption, scattering, reflection and transmissionspectra of gold and aluminum nanoantenna-loaded waveguides were calculated bymeans of 3D finite-difference time-domain simulations for single wavespropagating along the waveguide, as well as for standing wave scenarioscomposed from two counterpropagating waves. The investigated configurationsshowed losses of roughly 1% and extinction ratios greater than 25 dB formodulator and switching applications, as well as plasmon effects such as strongfield enhancement and localization in the nanoantenna region. The proposedplasmonic coherent perfect absorbers can be utilized for ultracompactall-optical switches in coherent networks as well as modulators and can findapplications in sensing or in increasing nonlinear effects.
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