Tunable Omnidirectional Broadband Band-Stop Filter in Symmetric Hybrid Plasmonic Structures

We numerically investigate a symmetric hybrid waveguide-plasmon system composed of a periodic metallic nanowires pairs array embedded in symmetric dielectric sandwich layers for band-stop filtering in the optical frequency range. The proposed symmetric system shows an omnidirectional broadband absorption enhancement with flat band-stop transmission induced by the coupling and hybridization of photonic and plasmonic modes. The transmission stop band bandwidth ranging from 80 to 585 nm is observed. The bandwidth of the proposed system can be further manipulated by tailoring their geometrics for potential applications in plasmonic-assisted broadband optical filtering.