Plasmonic-Induced Transparency in Metal–Dielectric–Metal Waveguide Bends

We have numerically investigated an analog of electromagnetically induced transparency (EIT) in a metal–dielectric–metal (MDM) waveguide bend. The geometry consists of two asymmetrical stubs extending parallel to each arm of a 90° MDM waveguide bend. Finite-difference time-domain (FDTD) simulations show that a transparent window is located at 1550 nm, which is the phenomenon of plasmonic-induced transparency (PIT). The large group index up to 63 can be obtained at the PIT window. The velocity of the plasmonic mode can be largely slowed down while propagating along the MDM bends. Our proposed configuration may thus be applied to storing and stopping light in plasmonic waveguide bends.

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