Nanoantenna couplers for metal-insulator-metal waveguide interconnects
Date
2010Source Title
Proceedings of SPIE
Print ISSN
0277-786X
Publisher
SPIE
Volume
7757
Language
English
Type
Conference PaperItem Usage Stats
181
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144
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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
CouplerDipole
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/11693/28439Published Version (Please cite this version)
http://dx.doi.org/10.1117/12.876177Collections
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