Nanoantenna couplers for metal-insulator-metal waveguide interconnects
Author(s)Onbasli, Mehmet Cengiz; Okyay, Ali K.
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State-of-the-art copper interconnects suffer from increasing spatial power dissipation due to chip downscaling and RC delays reducing operation bandwidth. Wide bandwidth, minimized Ohmic loss, deep sub-wavelength confinement and high integration density are key features that make metal-insulator-metal waveguides (MIM) utilizing plasmonic modes attractive for applications in on-chip optical signal processing. Size-mismatch between two fundamental components (micron-size fibers and a few hundred nanometers wide waveguides) demands compact coupling methods for implementation of large scale on-chip optoelectronic device integration. Existing solutions use waveguide tapering, which requires more than 4λ-long taper distances. We demonstrate that nanoantennas can be integrated with MIM for enhancing coupling into MIM plasmonic modes. Two-dimensional finite-difference time domain simulations of antennawaveguide structures for TE and TM incident plane waves ranging from λ = 1300 to 1600 nm were done. The same MIM (100-nm-wide Ag/100-nm-wide SiO2/100-nm-wide Ag) was used for each case, while antenna dimensions were systematically varied. For nanoantennas disconnected from the MIM; field is strongly confined inside MIM-antenna gap region due to Fabry-Perot resonances. Major fraction of incident energy was not transferred into plasmonic modes. When the nanoantennas are connected to the MIM, stronger coupling is observed and E-field intensity at outer end of core is enhanced more than 70 times.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
Proceedings of SPIE--the International Society for Optical Engineering
SPIE--the International Society for Optical Engineering
Onbasli, M. Cengiz, and Ali K. Okyay. “Nanoantenna Couplers for Metal-insulator-metal Waveguide Interconnects.” Proc. SPIE 7757, Plasmonics: Metallic Nanostructures and Their Optical Properties VIII,(September 10, 2010) Ed. Mark I. Stockman. 2010. 77573R–77573R–11. CrossRef. Web.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering.
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