A nanoscale refractive index sensor in two dimensional plasmonic waveguide with nanodisk resonator

A multifunction filter based on plasmonic waveguide with double-nanodisk-shaped resonators

“…The grid sizes in the x and the y directions are chosen as5nm × 5nm,and the time step, derived by Courant condition is t = 0.95/c ( x) 2 + ( y) 2 [19], where c stands for the speed of light in free space. The fundamental TM mode of the plasmonic waveguide is excited by a dipole source.…”

“…When a TM z plane wave is incident upon a two dimensional circular disk, the incident, scattered and transmitted fields, by imposing the boundary conditions for tangential magnetic and electric fields at the surrounding surface of the disk, can be expressed as [18,19] a i n k d J n (k d r) + a s n k d H…”

“…The coefficientsa i n ,a s n , and a t n are the amplitudes of the incident, scattered and transmitted fields, respectively.Á d andÁ m are the intrinsic impedances of dielectric and metal, respectively.k d = k 0 √ ε d andk m = k 0 √ ε m are, respectively, the numbers in the dielectric and metal, and k 0 is the free-space wave vector.ε d and ε m are, respectively, dielectric constants of the dielectric and metal, and r is the radius of the disk [19]. J n and J n are the first kind Bessel function with the order n and its derivation,…”

“…(2) and (3) for unknown coefficient a i n anda t n . For a nontrivial solution, the determinant of the matrix of the coefficients must be zero, so the resonant condition can be given by [2,15,[18][19][20] …”

Subwavelength plasmonic band-pass filter based on metal-insulator-metal structure with elliptic resonator

“…Until now, numerous plasmonic structures applicable in diverse systems, such as power splitters [4], couplers [5], modulators [6], all-optical logic gates [7], and sensors [8] have been designed and demonstrated.…”