Impedance-matching surface plasmon absorber for FDTD simulations

Chien Chang Chao, Sheng Han Tu, Chih Ming Wang, Hung I. Huang, Chii Chang Chen, Jenq Yang Chang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The perfectly matched layer (PML) can be used as an excellent boundary in the finite-difference time-domain method; however, it fails to absorb surface plasmon (SP) wave directly. In order to absorb an incident SP wave at the edge of a metal surface, an impedance-matching layer (IML) is implemented between the metal surface and the PML. A very low SP wave reflectance of -26.54 dB is achieved through the use of an IML with a length of only λ/3. The IML significantly reduces SP wave reflectance and creates a quasi-infinite regime for the purpose of SP wave propagation on the metal's surface while the acquired simulation area undergoes a slight increase.

Original languageEnglish
Pages (from-to)51-55
Number of pages5
Issue number1
StatePublished - Mar 2010


  • Impedance-matching layer
  • Optical processing
  • Surface plasmons


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