Beyond Silver and Gold: Better material buildingblocks are essential in transforming the novel ideas of plasmonics and metamaterials into technologies of the future, as reviewed by Alexandra Boltasseva and co-workers on page 3264. Devices built from tailored materials offer improved performance and new functionalities with applications in sensing, imaging, data storage, novel light sources, energy conversion, quantum optics and others. The cover image depicts a negatively refracting metamaterial device built from novel materials. Image prepared with the help of Dr. Alexander V. Kildishev.
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