Highly tunable refractive index visible-light metasurface from block copolymer self-assembly

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The refractive index of natural transparent materials is limited to 2-3 throughout the visible wavelength range. Wider controllability of the refractive index is desired for novel optical applications such as nanoimaging and integrated photonics. We report that metamaterials consisting of period and symmetry-tunable self-assembled nanopatterns can provide a controllable refractive index medium for a broad wavelength range, including the visible region. Our approach exploits the independent control of permeability and permittivity with nanoscale objects smaller than the skin depth. The precise manipulation of the interobject distance in block copolymer nanopatterns via pattern shrinkage increased the effective refractive index up to 5.10. The effective refractive index remains above 3.0 over more than 1,000 nm wavelength bandwidth. Spatially graded and anisotropic refractive indices are also obtained with the design of transitional and rotational symmetry modification
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-09
Language
English
Article Type
Article
Keywords

METAMATERIALS; NANOSTRUCTURES; LITHOGRAPHY; GRAPHOEPITAXY; NANOPARTICLES; MANAGEMENT; CRYSTALS

Citation

NATURE COMMUNICATIONS, v.7

ISSN
2041-1723
DOI
10.1038/ncomms12911
URI
http://hdl.handle.net/10203/214284
Appears in Collection
MS-Journal Papers(저널논문)
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