【研究成果】2012

研究成果50

Excitation Control of Long-Range Surface Plasmons by Two Incident Beams
Masashi Miyata and Junichi Takahara
9493 APRIL 2012 VOL 20 OPTICS EXPRESS

It was demonstrated experimentally that the excitation of long-range surface plasmon polaritons (LRSPs) can be controlled by two incident beams. We have shown the LRSPs modulated by the phase difference or the intensity ratio between the two beams. These results indicate that the excitation control can be applied to active plasmonic devices including modulators, switching and logic gates based on LRSPs. We expect that our findings will further highlight the wide photonic functionality made available by SPPs.

The selective excitation of LRSPs. (a, b) The experimentally observed scattering from the tip (shown by the dashed circle) for the case of Δϕ = 0 (a) and Δϕ = π (b). (c, d) The field distributions (|E|2, on the Ag surface) of SPP modes excited by two beams with Δϕ = 0 (c) and Δϕ = π (d), in the FDTD simulation. The color scale is the same for both figures.