Abstract
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 language | English |
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Pages (from-to) | 1103-1105 |
Number of pages | 3 |
Journal | IEEE Photonics Technology Letters |
Volume | 20 |
Issue number | 13 |
DOIs | |
Publication status | Published - 1 Jul 2008 |
Externally published | Yes |
Keywords
- Filters
- Plasmonics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering