Abstract
Plasmonic modes in rectangular metallic waveguides are analyzed in depth and are demonstrated to possess attractive properties for different applications. Their dispersion characteristics allow for wide range of applications including slow and fast light, metamaterial, low loss energy transmission, and opportunities for sensing devices. The sensitivity of this waveguide configuration is higher than its counterparts and can reach four times the sensitivity of the MIM structures. The characteristics of the TM(10) mode are demonstrated. Its applications for sensing, low propagation loss with relaxed practical dimension are also highlighted. A high effective index of more than 30 is also obtainable for the TE(01) mode for slow light operation. A non resonant negative index material with isotropic polarization in the visible region is also proposed using this waveguide structure.
Highlights
Surface plasmon polariton (SPPs) waveguides have attracted enormous attention in the last decade due to their useful ability to guide the light on the nanometer scale with remarkably useful characteristics
Unlike conventional photonic waveguides, which are based on total internal reflection (TIR), rectangular 3D metallic waveguides can guide light utilizing SPPlike modes with no restriction on the optical properties of the core region
The tightly confined optical field obtained using SPP waveguides provides a solution for the size incompatibility of electronic components and conventional photonic devices
Summary
Surface plasmon polariton (SPPs) waveguides have attracted enormous attention in the last decade due to their useful ability to guide the light on the nanometer scale with remarkably useful characteristics. Using SPP waveguides as a building block for optical devices enables sensing and optical interconnects and extends to unconventional electromagnetics phenomena such as extra ordinary transmission (EOT) and negative index optical materials These effects have been exploited in wide range of interesting applications. The rectangular metallic waveguide has fundamentally different characteristics than MIM and IMI based waveguides These characteristics include for example the cutoff wavelength, and the properties for various polarization types. Many interesting phenomena occur if the rectangular waveguide is operating close to its cutoff wavelength These phenomena include high transmission and energy tunneling [12]. The high sensitivity of the rectangular waveguide for the core material is demonstrated for sensing applications This waveguide has much higher sensitivity than MIM structures over the entire operating band.
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