Abstract
Hybrid-mode waveguides consisting of a metal surface separated from a high index medium by a low index spacer have attracted much interest recently. Power is concentrated in the low index spacer region for this waveguide. Here we investigate the properties of the hybrid mode in detail and numerically demonstrate the possibility of realizing compact waveguide bends using this wave guiding scheme.
Highlights
Surface plasmons (SP) offer some unique features which can be useful for many different applications [1]; for example SP based biosensing is already a well established and commercially successful technology [2]
One particular structure that is the focus of much interest is the hybrid waveguide consisting of a high index medium separated from a metal surface by a low index spacer [11,12,13,14]
From the discussions of this section we can identify the following attractive features of the hybrid mode: (1) it can guide power in more confined fashion compared to single interface SP mode for the same propagation distance, (2) power is highly concentrated in low index spacer layer and (3) the propagation distance of the mode is relatively insensitive to change in permittivity of the cover layer
Summary
Surface plasmons (SP) offer some unique features which can be useful for many different applications [1]; for example SP based biosensing is already a well established and commercially successful technology [2]. Another motivation behind the growing interest in plasmonics is the potential for the realization of very compact photonic devices which is not possible using a conventional index guiding scheme [3].
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