arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.05488physics.optics
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一种片上全电介质可加工容差零折射率超材料

On-chip all-dielectric fabrication-tolerant zero-index metamaterials

Shota Kita, Yang Li, Philip Muñoz, Orad Reshef, Daryl I. Vulis, Robert W. Day, Eric Mazur, Marko Lončar

摘要:

零折射率超材料(ZIMs)提供了前所未有的操纵光的方法,并且在广泛的应用中引起兴趣,包括光学隐身、超耦合和非线性光学中的非常规相位匹配特性。阻抗匹配的ZIM可以通过由布里渊区中心处的两个线性带(通常是电偶极子模式和横向磁偶极模式)的意外简并引起的光子Dirac-cone(PDC)色散来获得。因此,PDC只能针对超材料的几何参数的特定组合来实现,并且因此对制造缺陷敏感。这些制造缺陷可能限制在实际应用中的有用性。在这项工作中,我们克服了这个障碍,并证明了强大的全介质(AD)ZIM,支持PDC分散在宽的参数空间。我们的结构,由硅柱阵列在二氧化硅衬底上,是在硅绝缘体(SOI)平台上制造的,并在电信波长工作。

英文摘要:

Zero-index metamaterials (ZIMs) offer unprecedented ways to manipulate the flow of light, and are of interest for wide range of applications including optical cloaking, super-coupling, and unconventional phase-matching properties in nonlinear optics. Impedance-matched ZIMs can be obtained through a photonic Dirac-cone (PDC) dispersion induced by an accidental degeneracy of two linear bands - typically an electric monopole mode and a transverse magnetic dipole mode - at the center of the Brillouin zone. Consequently, PDC can only be achieved for a particular combination of geometric parameters of the metamaterial, and hence is sensitive to fabrication imperfections. These fabrication imperfections may limit the usefulness in practical applications. In this work we overcome this obstacle and demonstrate robust all-dielectric (AD) ZIM that supports PDC dispersion over wide parameter space. Our structure, consisting of an array of Si pillars on silica substrate, is fabricated in silicon-oninsulator (SOI) platform and operates at telecom wavelengths.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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