Journal
NANO LETTERS
Volume 10, Issue 6, Pages 1991-1997Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1008019
Keywords
Transformation optics; surface plasmon polariton; metamaterial
Categories
Funding
- U.S. Army Research Office (ARO) [W911NF-09-1-0539]
- National Science Foundation Nano-scale Science and Engineering Center [CMMI-0751621]
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We propose and demonstrate efficiently molding surface plasmon polaritons (SPPs) based on transformation optics. SPPs are surface modes of electromagnetic waves tightly bound at metal-dielectric interfaces, which allow us to scale optics beyond the diffraction limit. Taking advantage of transformation optics, here we show that the propagation of SPPs can be manipulated in a prescribed manner by careful control of the dielectric material properties adjacent to a metal. Since the metal properties are completely unaltered, this methodology provides a practical way for routing light at very small scales. For instance, our approach enables SPPs to travel at uneven and curved surfaces over a broad wavelength range, where SPPs would normally suffer significant scattering losses. In addition, a plasmonic 180 degrees waveguide bend and a plasmonic Luneburg lens with simple designs are presented. The unique design flexibility of the transformational plasmon optics introduced here may open a new door to nano optics and downscaling of photonic circuits.
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