期刊
NATURE PHOTONICS
卷 7, 期 10, 页码 791-795出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.214
关键词
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资金
- Office of Naval Research [N00014-11-1-0521, N00014-12-1-0571]
- United States-Israel Binational Science Foundation [2010460]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
Metamaterials offer unprecedented flexibility for manipulating the optical properties of matter, including the ability to access negative index(1-4), ultrahigh index(5) and chiral optical properties(6-8). Recently, metamaterials with near-zero refractive index have attracted much attention(9-13). Light inside such materials experiences no spatial phase change and extremely large phase velocity, properties that can be applied for realizing directional emission(14-16), tunnelling waveguides(17), large-area single-mode devices(18) and electromagnetic cloaks(19). However, at optical frequencies, the previously demonstrated zero- or negative-refractive-index metamaterials have required the use of metallic inclusions, leading to large ohmic loss, a serious impediment to device applications(20,21). Here, we experimentally demonstrate an impedance-matched zero-index metamaterial at optical frequencies based on purely dielectric constituents. Formed from stacked silicon-rod unit cells, the metamaterial has a nearly isotropic low-index response for transverse-magnetic polarized light, leading to angular selectivity of transmission and directive emission from quantum dots placed within the material.
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