Compact Antenna for Efficient and Unidirectional Launching and Decoupling of Surface Plasmons
Langue
en
Article de revue
Ce document a été publié dans
Nano Letters. 2011-09-12, vol. 11, n° 10, p. 4207
American Chemical Society
Résumé en anglais
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, ...Lire la suite >
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.< Réduire
Mots clés en anglais
Surface plasmon polariton
unidirectional launcher and decoupler
plasmonic nanoantenna
diffraction gratings
Origine
Importé de halUnités de recherche