Abstract
In this paper, we present a theoretical discussion of the
design of bidirectional wave couplers based on plasmonic Bragg gratings in
the near infrared domain. A key feature in the design of the plasmonic Bragg
gratings is the dependence of the effective refractive index on the thickness
of the dielectric layer. These gratings, which function as band rejection
filters, enable directional coupling of different SPP modes. By placing two
gratings with different band gaps on opposite sides of a subwavelength metallic
slit, a bidirectional plasmonic surface wave coupler can be realized. Two-dimensional
(2-D) FDTD simulations were performed to elucidate the properties of the device,
and were found to agree well with the theoretical predictions. Finally, the
wave confinement properties of the plasmonic Bragg gratings are studied further
by introducing the equivalent 1-D photonic crystal band structures.
© 2008 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription