Energy Splitting of Surface Plasmons in Tunable Multi Bow-tie Nanostructures
Paper ID : 1405-ICNS
Pouyan Rezapour1, hesam heydarian2, Afsaneh Shahmansouri1, Bizhan Rashidian *1
1Department of Electrical Engineering, Sharif University of Technology
2Department of electrical engineering, sharif university of technology
Plasmonic nanostructures have been recently used for energy sorting and confinement in the sub diffraction limit regions. Herein by employing the tunability of the grapheme layer, sorting frequency is actively controlled. To do so, an asymmetric nanostructure consists of double bowtie nano antenna is used to remove plasmonic mode degeneracy which results in energy splitting. Three-dimensional Method of Moment (MoM) technique is utilized to design and analysis the near field behavior of the device. By changing the geometrical parameters of the structure, we will be able to tune the optical spectra of the structure to generate two spatially separated deep subwavelength (20 × 20 nm2) hot spots in the 1710 and 1390 nm wavelengths. Furthermore, we show that by changing graphene’s Fermi energy, up to 70nm shift in the structure’s optical response is possible. In such plasmonic structures, tunabale optical filtering can be accomplished and may open the possibility to nanoscale multi-color photo detection.
Surface plasmons; color sorting; sub wavelength structures
Status : Abstract Accepted (Poster Presentation)