Journal
PHYSICAL REVIEW X
Volume 4, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.4.021026
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Funding
- MOST of China [2010CB630705, 2012CB921502]
- NSF of China [50972057, 11034005, 11204127, 61077023]
- MOE of China (SRFDP) [20120091120033]
- Jiangsu Province [BK2012301]
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By combining the advantages of both a metallic metamaterial and a dielectric interlayer, we demonstrate the general mechanism to construct the dispersion-free metastructure, in which the intrinsic dispersion of the metallic structures is perfectly cancelled out by the thickness-dependent dispersion of the dielectric spacing layer. As examples to apply this concept, a broadband quarter-wave plate and a half-wave plate are demonstrated. By selecting the structural parameters, the polarization state of light can be freely tuned across a broad frequency range, and all of the polarization states on the Poincare sphere can be realized dispersion free.
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