NSF Nanoscale Science and Engineering Center, University of California, Berkeley 3112 Etcheverry Hall, UC Berkeley, California 94720, United States.
Nano Lett. 2011 Jul 13;11(7):2825-8. doi: 10.1021/nl201189z. Epub 2011 May 27.
We report an invisibility carpet cloak device, which is capable of making an object undetectable by visible light. The cloak is designed using quasi conformal mapping and is fabricated in a silicon nitride waveguide on a specially developed nanoporous silicon oxide substrate with a very low refractive index (n<1.25). The spatial index variation is realized by etching holes of various sizes in the nitride layer at deep subwavelength scale creating a local effective medium index. The fabricated device demonstrates wideband invisibility throughout the visible spectrum with low loss. This silicon nitride on low index substrate can also be a general scheme for implementation of transformation optical devices at visible frequencies.
我们报告了一种隐形地毯斗篷设备，它能够使物体在可见光下不可见。该斗篷采用准共形映射设计，在专门开发的纳米多孔氧化硅衬底上的氮化硅波导中制造，该衬底具有非常低的折射率（n<1.25）。通过在氮化硅层中以深亚波长尺度蚀刻各种尺寸的孔来实现空间指数变化，从而创建局部有效介质指数。所制造的器件在整个可见光谱范围内具有低损耗的宽带隐形效果。这种在低折射率衬底上的氮化硅也可以作为在可见频率下实现变换光学器件的通用方案。
