| Surface Acoustic Wave (SAW) Assisted Excitation of Surface Plasmons in Graphene |
| Paper ID : 1624-UFGNSM-FULL |
| Authors: |
|
Mohammad Mahdi Mehrnegar *1, Sara Darbari2, Mohammad Kazem Moravvej-Farshi3 1Chamran Highway, Jalal AleAhmad, Tarbiat Modares University, Electrical engineering faculty, floor 5, ADSL Lab 2tehran, tarbiat modares university 3Tarbiat Modares University |
| Abstract: |
| Graphene is an atomically thin layer of carbon atoms in a honeycomb lattice. Unique electrical, mechanical and optical properties such as ultra-high carrier mobility and unusual carrier-density-dependent surface conductivity makes it an attractive two-dimensional (2D) material. Graphene has been proved promising in the propagation of guided surface plasmons (SPs) at its interface with a dielectric. Surface plasmons are electromagnetic waves, confined to the interface between a conductor and a dielectric that can propagate along the interface. Graphene SPs have longer propagation lengths compared to metallic SPs. Another advantage of graphene plasmons over conventional plasmons in noble metals is in-situ tunability by an electrical field, therefore graphene can be used in plasmonic devices and systems for a wide wavelength range from near infrared to THz. Strong spatial confinement of light in structure allows for the manipulation of light at subwavelength scales, beyond the diffraction limit. However, there is a strong mismatch between the SPs wave numbers in graphene and those of electromagnetic waves in free space. Several approaches have been proposed for excitation of SPs in graphene, like Otto-Kretschmann configurations or use of nano/micro-ribbons. An alternative approach is the use of periodic diffraction gratings on the graphene sheet. Typically, periodic corrugations are made through the fabrication process and cannot be changed later. In this context, we propose a SAW based periodic diffraction grating for efficient and controllable excitation of SPs in graphene. Simulation results show 37% of incident light is coupled to surface plasmons in graphene sheet that is 74 times better than previously reported results. |
| Keywords: |
| Plasmonic, Surface Acoustic Wave, Graphene, Light coupling |
| Status : Paper Accepted (Oral Presentation) |
