We proposed a symmetric V-type slit array to tune the propagation direction of surface plasmon polaritons by external control of the polarization and/or the inclination angle of the incident light. Using theoretical analysis and numerical simulation, we studied the position-related phase and spin-related phase of the SPPs excited by an inclined and circularly polarized light through a column of slits to determine the parameter of the structure. The results showed that we can tune the propagation of the SPPs with significant flexibility, by changing the polarization of the incident light and the inclination angle of the incident light. Furthermore, a nanostructures were designed to control directional launching of surface plasmons based on the principle of optical spin’s effect for the geometric phase of light. The propagation direction of the generated SPPs can be controlled by the spin of photons. The total size of the surface plasmon polariton (SPP) launcher is 320 nm by 180 nm, which is far smaller than the wavelength of the incident light. This result may provide a new way of spin-controlled directional launching of SPP.
Proc. SPIE. 6831, Nanophotonics, Nanostructure, and Nanometrology II
KEYWORDS: Light emitting diodes, Waveguides, Optical microscopy, Photonic crystals, Gallium nitride, Near field scanning optical microscopy, Near field, Radio propagation, Photonic microstructures, Near field optics
We propose and realize a micro-cylinder mode in photonic quasicrystal (PQC) on the top of an edge-emitting GaN light
emitting diodes (LEDs) with 30 μm indium tin oxides (ITO) covered and 8 μm GaN exposed broad-stripe. A
well-defined hexagon-like localized state following a C6v symmetry is identified from the PQC micro-cylinder arrays.
Enhancement factor of the surface light extraction from 12-fold PQC patterns on electrical current injected GaN-based
light emitters is 2.4 times higher than non-patterned regions, which is observed by scanning near-field optical
microscopy (SNOM). According to the near-field optical images, micro-cylinders can be considered as nano-optics
sources because the electromagnetic energy is strongly concentrated due to the wave guide modes and the beaming effect
of the surface microstructures.