| Designing a Graphene Plasmonic System Based on Metal Antenna for Detecting and Counting Nanoparticles |
| Paper ID : 1279-UFGNSM-FULL |
| Authors: |
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Vahid Faramarzi *1, Vahid Ahmadi2, Bashir Fotouhi1 1Tarbiat Modares University 2Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran |
| Abstract: |
| Surface plasmons are electromagnetic waves that are formed by coupling light and free-electron oscillations at the surface of a metal or a semiconductor. Plasmons provide unique properties of subwavelength optical confinement and significant local field enhancement, accompanied by a significant reduction of the wavelength compared to free-space incident wave radiation. Surface plasmons in graphene promise unique possibilities for controlling light in nanoscale devices, for merging optics with electronics and to enhance light-matter interactions. The conventional optical configuration utilizes prism and grating structures to efficiently excite surface plasmon modes. However, these optical configuration are massive and not suitable for high-density integration and fast modulation. On the other hand, resonant metallic antennas cab be used to efficiently lunch the graphene plasmons (GPs). Launching and control of propagating GPs by resonant metal antennas lead to various applications, such as sensing and particle detection. We propose an active plasmonic device based on graphene that can be used to detect and count metallic and dielectric micro- and nano-particles, in a simple configuration. The operating principles of the proposed system are based on the particles intrinsic properties (such as refractive index) that modulate the transmitted power. Simulations show that, by small change in particle refractive index, the output transmitted power changes significantly. It is shown that a relative change of ±10% in the refractive index of a 50-nm dielectric particle results in ∓2.3% variation in the transmitted power. Also, the small particles with a diameter of 20 nm can be detected by this configuration. Furthermore, the proposed system that can be implemented simply and inexpensively, benefits from its small footprint for integration into lab-on-a-chip devices. This active plasmonic device has promising potentials for single particle detection and biological applications. |
| Keywords: |
| plasmonic, refractive index, graphene plasmon, particle detection |
| Status : Paper Accepted (Poster Presentation) |
