Monday, September 12, 2011

Compact antenna for efficient and unidirectional launching and decoupling of surface plasmons. (arXiv:1109.2032v1 [physics.optics])

Compact antenna for efficient and unidirectional launching and decoupling of surface plasmons. (arXiv:1109.2032v1 [physics.optics]):
Controlling the launching efficiencies and the directionality of surface
plasmon polaritons (SPPs) and their decoupling to freely propagating light is a
major goal for the development of plasmonic devices and systems. Here, we
report on the design and experimental observation of a highly efficient
unidirectional surface plasmon launcher composed of eleven subwavelength
grooves, each with a distinct depth and width. Our observations show that,
under normal illumination by a focused Gaussian beam, unidirectional SPP
launching with an efficiency of at least 52% is achieved experimentally with a
compact device of total length smaller than 8 \mu m. Reciprocally, we report
that the same device can efficiently convert SPPs into a highly directive light
beam emanating perpendicularly to the sample.

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