Controlling guided modes in plasmonic metal/dielectric multilayer waveguides
| Autor: | Hans Peter Wagner, Xiaosheng Wang, Jonathan Thompson, Heidrun Schmitzer, N. Wickremasinghe |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 117:213102 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.4921874 |
| Popis: | We investigate the mode properties of planar dielectric aluminum-quinoline (Alq3) multilayer waveguides comprising one single or three equally spaced embedded nanometer-thin (∼10 nm thick) Alq3-Mg0.9:Ag0.1 composite metal-island layers. The plasmonic waveguides were fabricated by organic molecular beam deposition. Transverse magnetic (TM) and transverse electric (TE) modes were selectively excited using the m-line method. The symmetric plasmonic TM0 mode was launched in all waveguides and—in addition—two higher order plasmonic TM1 and TM2 modes were generated in waveguides comprising three metal layers. Other TM modes have hybrid dielectric-plasmonic characters, showing an increased effective refractive index when one electric field antinode is close to a metallic layer. TM modes which have all their antinode(s) in the dielectric layers propagate essentially like dielectric modes. TE modes with antinode(s) at the position of the metal layer(s) are strongly damped while the losses are low for TE modes comp... |
| Databáze: | OpenAIRE |
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