Landy Nathan I, Padilla Willie J
Department of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, USA.
Opt Express. 2009 Aug 17;17(17):14872-9. doi: 10.1364/oe.17.014872.
The past decade has seen a revolution in electromagnetics due to the development of metamaterials. These artificial composites have been fashioned to exhibit exotic effects such as a negative index of refraction. However, the full potential of metamaterial devices has only been hinted at. By combining metamaterials with transformation optics (TO), researchers have demonstrated an invisibility cloak. Subsequently, quasi-conformal mapping was used to create a device that exhibited a broadband cloaking effect. Here we extend this latter approach to a strictly conformal mapping to create reflection less, inherently isotropic, and broadband photonic devices. Our method combines the novel effects of TO with the practicality of all-dielectric construction. We show that our structures are capable of guiding light in an almost arbitrary fashion over an unprecedented range of frequencies.
在过去十年中，由于超材料的发展，电磁学领域发生了一场革命。这些人工复合材料被设计成具有诸如负折射率等奇异效应。然而，超材料器件的全部潜力尚未完全展现。通过将超材料与变换光学（TO）相结合，研究人员展示了一种隐形斗篷。随后，利用准共形映射创建了一种具有宽带隐形效果的器件。在此，我们将后一种方法扩展到严格共形映射，以创建无反射、固有各向同性的宽带光子器件。我们的方法将变换光学的新颖效应与全介质结构的实用性相结合。我们表明，我们的结构能够在前所未有的频率范围内以几乎任意的方式引导光。
