Abstract
We present a multilayer device which allows the control of Surface Plasmon (SP) propagation properties (propagation length and extension). A simple modification on an inner air gap thickness strongly affects SP propagation mode due to coupling with Parallel-Plate (PP) mode.
Highlights
It is well known that interface between positive and negative permittivity can sustain TM propagating wave which is evanescent in the normal direction of the interface, called Surface Plasmon (SP)
We have proposed and studied a multilayer device for active control of SP properties
For precise frequency - close to the forbidden frequency band - the parameter of PP mode becomes same as SPAir-Gold and coupling phenomena occurs
Summary
It is well known that interface between positive and negative permittivity can sustain TM propagating wave which is evanescent (exponentially decreasing) in the normal direction of the interface, called SP. As metal or doped semiconductor exhibits such negative permittivity for frequency less than the free electron gas plasma frequency, a conductor-dielectric interface can sustain this kind of mode. It is of great interest to obtain active control of SP propagation properties to provide new filter or sensor device. We present a simple and cheap way to change the field extension and propagation length. The device is a multi-layer stacked with one inner air layer whose thickness can be changed. By changing the inner-air-layer thickness the upper SP properties is modified due to coupling with PP mode. We think that this effect can be used for active band-pass filtering application. In this paper we will present calculation and interpretation of the phenomena occurring in the device
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