【研究成果】2013年
研究成果62
Mutual mode control of short- and long-range surface plasmons
Junichi Takahara and Masashi Miyata
Focused Issue（Surface Plasmon Photonics）/Optics Express, Vol. 21, Issue 22, pp. 27402-27410
A symmetric metal slab waveguide simultaneously supports two opposite types of propagation mode similar to a metal film: short-range surface plasmon (SRSP) like mode and long-range surface plasmon (LRSP) like mode. The strong field confinement of SRSP-like mode plays a crucial role for nano-optical integrated circuits in spite of short propagation length. In order to avoid the trade-off between field confinement and propagation length, we demonstrate selective mode excitation and mutual mode conversion for nanofocusing mediated by LRSP-like mode.
Simulated results of electric field intensity (|E|2 on the Ag surface) in a tapered lossless silver slab waveguide with h = 30nm: (a) selective excitation of ss0 mode in both sides with phase difference of 0 and (b) selective excitation of sa0 mode in both sides with phase difference of π. Note that each scale bar is normalized by the field maximum. The maxima are not equal each other.
