Journal
NANO LETTERS
Volume 11, Issue 10, Pages 4207-4212Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202135w
Keywords
Surface plasmon polariton; unidirectional launcher and decoupler; plasmonic nanoantenna; diffraction gratings
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Funding
- ERC [227577]
- European Research Council (ERC) [227577] Funding Source: European Research Council (ERC)
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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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