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Compact Antenna for Efficient and Unidirectional Launching and Decoupling of Surface Plasmons
Language
en
Article de revue
This item was published in
Nano Letters. 2011-09-12, vol. 11, n° 10, p. 4207
American Chemical Society
English Abstract
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, ...Read more >
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 μm. Reciprocally, we report that the same device can efficiently convert SPPs into a highly directive light beam emanating perpendicularly to the sample.Read less <
English Keywords
Surface plasmon polariton
unidirectional launcher and decoupler
plasmonic nanoantenna
diffraction gratings
Origin
Hal imported