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In this paper, we study the nanoscale-focusing effect in the far field for a spiral plasmonic lens with a concentric annular groove by using finite-difference time domain simulation. The simulation result demonstrates that a left-hand spiral plasmonic lens can concentrate an incident right-hand circular polarization light into a focal spot at the exit surface. And this spot can be focused into far...
In this paper, we investigate the focusing properties of a plasmonic lens with multiple-turn spiral nano-structures, and analyze its field enhancement effect based on the phase matching theory and finite-difference time-domain simulation. The simulation result demonstrates that a left-hand spiral plasmonic lens can concentrate an incident right-hand circular polarization light into a focal spot with...
The designment of Si-based 2D photonic crystal taper is presented. The software Rsoft incorporating finite-difference time-domain (FDTD) technique was used to simulate light propagation through this new structure. Plenty of methods have been tried to improve transmission coefficient and solve the problem of mode mismatch in photonic crystal devices. A taper with high transmission coefficient has been...
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