Figure 5
(a) Localized electric field intensity for a uniform grating with L = 500 nm, w = 10 nm, n = 9 and − 4 ≤ j ≤ + 4. All the nano-grooves localize identical plasmonic modes, except around the first excited mode around 5 mm where small variations in the resonance mode of different grooves are noted, (b) localized electric field intensity for a non-symmetric graded grating with L = 500 nm, w = 10 nm, Δ = 5 nm, n = 5 and − 4 ≤ j ≤ 0. Every groove resonates at a particular wavelength of light, and impedance matched graded grating exhibits a multiwavelength mode localization in a wide bandwidth of 600 nm to 6 µm. This multiwavelength localization is resulted from adiabatic mode transformation.
