Abstract
A hybrid plasmonic waveguide structure is proposed and fabricated for low-loss lightwave guiding along a metal stripe core. By embedding Au stripe in dual slab waveguides with high refractive-index contrast, the field of the guided mode is confined more in the two dielectric core layers. Thus, the propagation loss is significantly reduced. The guided mode is like a combination of a fundamental long-range surface plasmon polariton strip mode and a dual symmetric dielectric slab mode. We fabricate 5 nm-thick Au stripe optical waveguides and measure the optical properties at a wavelength of 1.31 microm. The propagation loss is less than 1.0 dB/cm with the metal stripe width of 1-5 microm.
Highlights
Surface plasmon polaritons (SPPs) are electromagnetic waves that propagate along a metaldielectric interface
We propose a new plasmonic waveguide structure utilizing multilayered dielectric cladding to lower the propagation loss of metal stripe optical waveguides
In order to reduce the propagation loss of Au stripe optical waveguide, we proposed a new hybrid plasmonic waveguide structure
Summary
Surface plasmon polaritons (SPPs) are electromagnetic waves that propagate along a metaldielectric interface. By placing thin intermediate dielectric layers with low refractive index below and above the metal film, the propagation loss could be reduced [12,13]. Though those methods are effective, the intensity of the guided mode supported by the metal stripes is always maximum at the metal-dielectric interface so that the ohmic loss of the metal is inevitable. We propose a new plasmonic waveguide structure utilizing multilayered dielectric cladding to lower the propagation loss of metal stripe optical waveguides.
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