• 文献标题:   Wide-angle perfect absorber using a 3D nanorod metasurface as a plasmonic sensor for detecting cancerous cells and its tuning with a graphene layer
  • 文献类型:   Article
  • 作  者:   RAKHSHANI MR
  • 作者关键词:   surface plasmon, metasurface, nanostructure, optical sensor, perfect absorber
  • 出版物名称:   PHOTONICS NANOSTRUCTURESFUNDAMENTALS APPLICATIONS
  • ISSN:   1569-4410 EI 1569-4429
  • 通讯作者地址:  
  • 被引频次:   31
  • DOI:   10.1016/j.photonics.2020.100883
  • 出版年:   2021

▎ 摘  要

We investigate a high-sensitivity plasmonic sensor that uses a hexagonal nanorod array metasurface with for identifying malignant hepatic metastases from healthy liver cells. This designed plasmonic metasurface has some advantages such as nanoscale dimensions, a high figure of merit and sensitivity to the refractive index, and insensitivity to the incident angle for 0 degrees to 60 degrees. With the 3D finite-difference time domain method, we study the output characteristics and the effect of geometrical parameters, materials, and incident angle on the plasmoninduced absorption resonances as well. A sensitivity of 1250 nm per refractive index unit (RIU) can be achieved when the change of the sensing medium refractive index Delta n=0.2, and the maximum figure of merit achieved is about 610 RIU-1. Also, graphene metasurfaces are used to obtain tunable characteristics. Our proposed structure not only has a nanoscale footprint of 200x200x50 nm(3), but also its plasmon-induced absorption resonances are not sensitive to the incident angle. This device holds great potential for the design of nanosensor devices and perfect absorbers.