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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 31 — Nov. 1, 2013
  • pp: 7498–7503

Ultrashort hybrid metal–insulator plasmonic directional coupler

Mahmoud Talafi Noghani and Mohammad Hashem Vadjed Samiei  »View Author Affiliations

Applied Optics, Vol. 52, Issue 31, pp. 7498-7503 (2013)

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An ultrashort plasmonic directional coupler based on the hybrid metal–insulator slab waveguide is proposed and analyzed at the telecommunication wavelength of 1550 nm. It is first analyzed using the supermode theory based on mode analysis via the transfer matrix method in the interaction region. Then the 2D model of the coupler, including transition arms, is analyzed using a commercial finite-element method simulator. The hybrid slab waveguide is composed of a metallic layer of silver and two dielectric layers of silica (SiO2) and silicon (Si). The coupler is optimized to have a minimum coupling length and to transfer maximum power considering the layer thicknesses as optimization variables. The resulting coupling length in the submicrometer region along with a noticeable power transfer efficiency are advantages of the proposed coupler compared to previously reported plasmonic couplers.

© 2013 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(230.7400) Optical devices : Waveguides, slab
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: June 12, 2013
Revised Manuscript: September 29, 2013
Manuscript Accepted: October 4, 2013
Published: October 24, 2013

Mahmoud Talafi Noghani and Mohammad Hashem Vadjed Samiei, "Ultrashort hybrid metal–insulator plasmonic directional coupler," Appl. Opt. 52, 7498-7503 (2013)

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