1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2.Joule Physics Laboratory, School of Computing, Science and Engineering, University of Salford, Salford, M5 4WT, UK
3.School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
4.Collaborative Innovation Center of Quantum Matter, Beijing, 200092, China
WX Li, Email: liwuxia@aphy.iphy.ac.cn
CZ Gu, Email: czgu@aphy.iphy.ac.cn
纸质出版日期:2015-09,
网络出版日期:2015-03-31,
收稿日期:2015-01-04,
修回日期:2015-03-23,
录用日期:2015-03-24
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Directly patterned substrate-free plasmonic "nanograter" structures with unusual Fano resonances[J]. LSA, 2015,4(3).
Cui, A. J. et al. Directly patterned substrate-free plasmonic "nanograter" structures with unusual Fano resonances. Light: Science & Applications, 4, e308 (2015).
Directly patterned substrate-free plasmonic "nanograter" structures with unusual Fano resonances[J]. LSA, 2015,4(3). DOI: 10.1038/lsa.2015.81.
Cui, A. J. et al. Directly patterned substrate-free plasmonic "nanograter" structures with unusual Fano resonances. Light: Science & Applications, 4, e308 (2015). DOI: 10.1038/lsa.2015.81.
The application of three-dimensional (3D) plasmonic nanostructures as metamaterials (MMs)
nano-antennas
and other devices faces challenges in producing metallic nanostructures with easily definable orientations
sophisticated shapes
and smooth surfaces that are operational in the optical regime and beyond. Here
we demonstrate that complex 3D nanostructures can be readily achieved with focused-ion-beam irradiation-induced folding and examine the optical characteristics of plasmonic "nanograter" structures that are composed of free-standing Au films. These 3D nanostructures exhibit interesting 3D hybridization in current flows and exhibit unusual and well-scalable Fano resonances at wavelengths ranging from 1.6 to 6.4 µm. Upon the introduction of liquids of various refractive indices to the structures
a strong dependence of the Fano resonance is observed
with spectral sensitivities of 1400 nm and 2040 nm per refractive index unit under figures of merit of 35.0 and 12.5
respectively
for low-order and high-order resonance in the near-infrared region. This work indicates the exciting
increasing relevance of similarly constructed 3D free-standing nanostructures in the research and development of photonics and MMs.
extraordinary Fano resonancesplasmonic nanostructuresspatially orientedsubstrate-freethree-dimensional
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