Theoretical Study of Hybrid Guided Modes in a Multilayer Symmetrical Planar Plasmonic Waveguide
| Autor: | Sarah Aldawsari, Wing-Ki Liu, Li Wei |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry Physics::Optics 02 engineering and technology Coupled mode theory Cladding (fiber optics) 01 natural sciences Waveguide (optics) Surface plasmon polariton Atomic and Molecular Physics and Optics 010309 optics 020210 optoelectronics & photonics Optics Planar 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Optoelectronics Radiation mode business Refractive index Plasmon |
| Zdroj: | Journal of Lightwave Technology. 33:3198-3206 |
| ISSN: | 1558-2213 0733-8724 |
| DOI: | 10.1109/jlt.2015.2438646 |
| Popis: | We presented a comprehensive theoretical study of the hybrid guided mode in a multilayer symmetrical planar plasmoinc waveguide, which is constructed with a thin film metal layer symmetrically sandwiched by three dielectric low/high/low-index layers. The seven-layer planar plasmonic structure can support super long-range plasmonic modes with strong subwavelength confinement in the low-index gap layer. We derived the dispersion equations for the guided mode and characterized the hybrid guided mode based on our derived analytical expressions. We explained how the variations in the thickness of the low-index gap and high-index cladding could change the types of the hybrid mode from strong surface plasmon polariton (SPP)-like mode, to SPP-dielectric waveguide (DW)-like mode, and further to strong-DW-like mode. We also found that by tailoring the geometric dimensions of the waveguide, the plasmonic mode of the multilayer structure can be optimized with the strongest mode confinement at the nanoscale gap. The combination of tight light confinement and long-range propagation length makes the seven-layer plasmonic waveguide an excellent candidate for applications in chip-scale plasmonic integrated circuits. The presented theoretical analysis shall be very useful in the design and optimization of active and passive nanoplasmonic devices. |
| Databáze: | OpenAIRE |
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