Abstract : A plasmonic inverse rib optical waveguide geometry is proposed and investigated, inspired by the recent CdS-nanorod-on-silver plasmonic laser. The proposed technology is suitable for large scale fabrication. It only uses a single wet resist development and several coatings onto a flat metal surface to define the waveguide geometry. It thus relieves the need to etch or lift-off a noble metal. High-index sol-gel inverse ribs are privileged candidates for the tightest confinement. We investigate and explain the guidance mostly for the case of Au and the wavelengths around =633 nm. We get spot sizes down to 2560 nm2. We notably describe how easily the tigh confinement is granted and the reasons why only a single critical step defines the modal geometry.
We finally detail how the classical building-blocks of integrated optics such as distributed reflectors and couplers can be made within the very same approach and integrated into devices for which losses are described.
https://hal-iogs.archives-ouvertes.fr/hal-00546215
Contributor : Christophe Sauvan <>
Submitted on : Monday, December 7, 2015 - 11:29:46 AM Last modification on : Wednesday, October 14, 2020 - 4:01:40 AM Long-term archiving on: : Tuesday, March 8, 2016 - 12:00:56 PM
Henri Benisty, Mondher Besbes. Plasmonic inverse rib waveguiding for tight confinement and smooth interface definition. Journal of Applied Physics, American Institute of Physics, 2010, 108, pp.063108. ⟨10.1063/1.3478746⟩. ⟨hal-00546215⟩