Abstract
Efficient broadband coupling of light between a dielectric waveguide and a hybrid plasmonic waveguide is investigated theoretically. A plasmonic linear taper is used as a coupler which connects the two types of waveguides. Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4 microm, which achieves a coupling efficiency of 70% (1.5 dB) at the 1.55 microm telecommunication wavelength.
Highlights
There exists great expectation for integrated photonic circuits, which would speed up on-chip information processing and promise many other photonics-related applications
A plasmonic linear taper is used as a coupler which connects the two types of waveguides
Broadband coupling is realized by such a compact plasmonic taper with a length of only 0.4μm, which achieves a coupling efficiency of 70% (1.5dB) at the 1.55μm telecommunication wavelength
Summary
There exists great expectation for integrated photonic circuits, which would speed up on-chip information processing and promise many other photonics-related applications. Several different types of plasmonic waveguides have been proposed, such as metallic nanoparticle chain waveguides [1,2], metallic wires or stripe waveguides [3,4], channel or wedge plasmonic waveguides [5,6,7], plasmonic slot waveguides [8], hybrid plasmonic waveguides [9,10,11,12,13] These plasmonic waveguides have a trade-off between their mode confinement and propagation length. The hybrid plasmonic (HP) waveguide [9,10,11,12,13] is found to be relatively superior: it has a large propagation length (several-hundred micrometers) with a subwavelength mode confinement. Our design fully takes experimental considerations including both material and geometry into account, is ready realizable
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