Enhancing on/off ratio of a dielectric-loaded plasmonic logic gate with an amplitude modulator

Kai Hao Chang, Zhan Hong Lin, Po Tsung Lee*, Jer Shing Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Plasmonic waveguides allow focusing, guiding, and manipulating light at the nanoscale and promise the miniaturization of functional optical nanocircuits. Dielectric-loaded plasmonic (DLP) waveguides and logic gates have drawn attention because of their relatively low loss, easy fabrication, and good compatibility with gain and active tunable materials. However, the rather low on/off ratio of DLP logic gates remains the main challenge. Here, we introduce an amplitude modulator and theoretically demonstrate an enhanced on/off ratio of a DLP logic gate for XNOR operation. Multimode interference (MMI) in DLP waveguide is precisely calculated for the design of the logic gate. Multiplexing and power splitting at arbitrary multimode numbers have been theoretically analyzed with respect to the size of the amplitude modulator. An enhanced on/off ratio of 11.26 dB has been achieved. The proposed amplitude modulator can also be used to optimize the performance of other logic gates or MMI-based plasmonic functional devices.

Original languageEnglish
Article number5020
JournalScientific reports
Issue number1
StatePublished - Dec 2023


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