Angle-independent infrared filter assisted by localized surface plasmon polariton

C.M. Wang, Y.C. Chang, M.W. Tsai, Y.H. Ye, C.Y. Chen, Y.W. Jiang, S.C. Lee, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)


A plasmonic infrared (IR) filter was experimentally and theoretically investigated. A localized surface plasmon polariton (LSPP) mode which was angle-independent in almost fully incident angle was observed. Through the use of the LSPP mode, an IR reflection-type notch filter with an ultrahigh immunity for the angular deviation was realized. An angle-independent reflection dip was designed at ? = 6.2 ?m with a full-width at half-maximum of 0.5 ?m. The experimental result shows that the position and the line shape of the resonant dip at ? = 6.2 ?m remain the same for an increasing incident angle from 20° to 60°. The optical properties can be engineered by tuning thickness of the cavity layer. The proposed notch filter presents a large angular tolerance means that the superior angular stability makes it more feasible as it is put into practical applications. © 2008 IEEE.
Original languageEnglish
Pages (from-to)1103-1105
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number13
Publication statusPublished - 1 Jul 2008
Externally publishedYes


  • Filters
  • Plasmonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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