Controllable multiple plasmonic bending beams via polarization of incident waves

Abstract

Plasmonic bending beams, which preserve their spatial shapes while propagating along curved trajectories in metal-dielectric interface, offer important applications in the fields of fiber sensor, optical trapping, and micro-nano manipulation. In this work, circular hole array, as a local point-like sources of surface plasmon polaritons, is designed on the metal film to generate multiple plasmonic bending beams. The electric field intensity of multiple plasmonic bending beams is controlled by polarization angle of input light. In addition, the electric filed intensity of multiple plasmonic bending beams relies on circle hole radius. These findings provide guidance in the design and optimization of plasmonic bending beam generators.

Manipulating surface plasmon polaritons with M-shaped nanoslit array via polarized incident waves

“…For example, the splitting angles, the electricfield intensity and coupling orientation of two separated SPPs beams were controlled by the topological charges of the input light with orbital angular momentum (OAM) [51]. The electric-field intensity of multiple plasmonic bending beams was used to control the polarization angle of input light waves [52]. However, the relationship among the electric-field intensity, coupling orientation of SPBs and polarization of input light waves is ambiguous.…”

“…According to eq. ( 5), the desired phase ϕ(x) = −1.33kax 1.5 is obtained [48,52]. The position of every structure can be directly located by the phase ϕ(x).…”

Tunable Multiple Surface Plasmonic Bending Beams into Single One by Changing Incident Light Wavelength

“…, where tan θ = f (y), and f (y) is the firstorder derivative of the designed bending trajectory f (y) [20,50,57,58]. For simplicity, the paraxial regime (sin θ ≈ tan θ) was also applied, and the required phase can be obtained by φ(x) = − k 0 sin θdx.…”

Formation of Surface Plasmon-Polariton Vortices at Reflection from Curvilinear Boundary

“…Scattering of SPPs on the inhomogeneities of various configurations at the boundary between the dielectric and metal leads to enrichment of the mode composition of the SPPs, as well as to the interconnection of modes in microwave guides and microcavities, and to radiation from the metal and dielectric interface of bulk electromagnetic waves. In this field of research a large volume of theoretical and experimental works are devoted to scattering of the SPPs on various inhomogeneities in the metal layers [11][12][13][14], to focusing and controlling the SPPs by electromagnetic fields, and to various dielectric and metallic nanostructures on a chips and plasmon lenses [15][16][17][18][19][20][21][22][23][24][25][26]. Figure 1: Generation of the SPPs in the metal layer according to the Kretchmann scheme, and reflection of the SPPs from the boundary of permittivity inhomogeneity in the layer: is the angle between the tangent to the boundary of the inhomogeneity and the transverse axis .…”