Angle-Independent Infrared Filter Assisted by Localized Surface Plasmon Polariton

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.

Angular dependence of optical modes in metal-insulator-metal coupled quantum well infrared photodetector

“…11 The splitting of the surface plasmon polariton (SPP) resonance in the perforated gold film and the plasmonic microcavity has also been reported in the transmission or reflection schemes. [12][13][14][15][16][17] Transmission/reflection measurements are in the far-field regime, from which the near-field characteristics can be explored.…”

Transmissive/Reflective Structural Color Filters: Theory and Applications

“…Furthermore, the FWHM around 30 nm is much smaller than the hole array color filters, which has potential application in spectral imaging. Reflective color filters based on MIM structure have also been demonstrated [40,41]. A Ag-SiO 2 -Ag structure supports LSPR resulting in angle robust color filtering as shown in Figure 8 [40], which is different from FP cavity resonance.…”

“…Reflective color filters based on MIM structure have also been demonstrated [40,41]. A Ag-SiO 2 -Ag structure supports LSPR resulting in angle robust color filtering as shown in Figure 8 [40], which is different from FP cavity resonance. The MIM structure can also be used to tune the guided mode dispersion and construct a plasmonic lens [42][43][44].…”

Dyakonov surface waves in lossy metamaterials

“…The relevance of these surface plasmons falls not only upon its inherent subwavelength localization, but also they enable an amplification of evanescent signals traveling near the surfaces [2]. These functionalities are being implemented within the lasts years for applications including optical sensing [3], signal filtering [4], subdiffraction focusing and subwavelength resolution imaging [5,6,7,8,9].…”