Integrated amorphous silicon-aluminum long-range surface plasmon polariton (LR-SPP) waveguides

Boaz Sturlesi, Meir Grajower, Noa Mazurski, Uriel Levy

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We demonstrate the design, fabrication, and experimental characterization of a long range surface plasmon polariton waveguide that is compatible with complementary metal-oxide semiconductor backend technology. The structure consists of a thin aluminum strip embedded in amorphous silicon. This configuration offers a symmetric environment in which surface plasmon polariton modes undergo minimal loss. Furthermore, the plasmonic mode profile matches the modes of the dielectric (amorphous silicon) waveguide, thus allowing efficient coupling between silicon photonics and plasmonic platforms. The propagation length of the plasmonic waveguide was measured to be about 27 μm at the telecom wavelength around 1550 nm, in good agreement with numerical simulations. As such, the waveguide features both tight mode confinement and decent propagation length. On top of its photonic properties, placing a metal within the structure may also allow for additional functionalities such as photo-detection, thermo-optic tuning, and electro-optic control to be implemented.

Original languageAmerican English
Article number036103
JournalAPL Photonics
Issue number3
StatePublished - 1 Mar 2018

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© 2018 Author(s).


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