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      Nanoantenna couplers for metal-insulator-metal waveguide interconnects

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      Author
      Onbasli, M.C.
      Okyay, Ali Kemal
      Date
      2010
      Source Title
      Proceedings of SPIE
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      7757
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      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. © 2010 SPIE.
      Keywords
      Coupler
      Dipole
      Metal-insulator-metal
      Nanoantenna
      Plasmon resonance
      Subwavelength
      Waveguide
      Coupler
      Dipole
      Metal-insulator-metal
      Nanoantennas
      Plasmon resonance
      Sub-wavelength
      Antennas
      Finite difference time domain method
      Integration
      Metal insulator boundaries
      Metals
      Nanostructures
      Optical properties
      Optical signal processing
      Optoelectronic devices
      Plasmons
      Semiconductor insulator boundaries
      Signal processing
      Surface plasmon resonance
      Waveguides
      MIM devices
      Permalink
      http://hdl.handle.net/11693/28439
      Published Version (Please cite this version)
      http://dx.doi.org/10.1117/12.876177
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      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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