Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 34, Issue 4, Pages 1333-1343Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2015.2511447
Keywords
Long-range hybrid plasmonic waveguides; nonlinear optics; optical bistability; plasmonics
Funding
- European Union (European Social Fund)
- Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework
- Greek national funds through Research Funding Program THALES Reinforcement of the interdisciplinary and/or inter-institutional research and innovation (Project ANEMOS)
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A side-coupled disk-waveguide system based on a long-range hybrid plasmonic waveguiding configuration is theoretically investigated for Kerr bistability and self-pulsation. The nonlinear response is studied with a theoretical framework combining perturbation theory and temporal coupled-mode theory, where all relevant effects, including two-photon absorption (TPA) as well as free-carrier dispersion (FCD) and absorption (FCA), are taken into account. We show that bistable operation with input powers as low as 40 mW is possible; a consequence of the significant reduction in resistive losses made possible by the long-range waveguiding principle. The effect of TPA, FCD, and FCA on the nonlinear response is thoroughly assessed and it is shown that carrier lifetime must drop to 8 ps in order to suppress free-carrier effects and obtain a high-quality bistable response, which is subsequently exploited for demonstrating ultrafast memory operation with low power requirements and high extinction ratio between states. Finally, by appropriate tuning of the carrier lifetime, FCD can lead to self-pulsation. The operating regimes in the detuning-power space are identified and the characteristics of the spontaneous oscillation discussed.
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