Self-organized plasmonic metasurfaces for all-optical modulation

被引:27
作者
Della Valle, G. [1 ,2 ]
Polli, D. [1 ,2 ]
Biagioni, P. [1 ]
Martella, C. [3 ,4 ]
Giordano, M. C. [3 ,4 ]
Finazzi, M. [1 ]
Longhi, S. [1 ,2 ]
Duo, L. [1 ]
Cerullo, G. [1 ,2 ]
de Mongeot, F. Buatier [3 ,4 ]
机构
[1] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy
[2] CNR, Ist Foton & Nanotecnol, I-20133 Milan, Italy
[3] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy
[4] CNISM, I-16146 Genoa, Italy
关键词
ELECTRON THERMALIZATION; DYNAMICS; RELAXATION; ABSORPTION;
D O I
10.1103/PhysRevB.91.235440
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We experimentally demonstrate a self-organized metasurface with a polarization dependent transmittance that can be dynamically controlled by optical means. The configuration consists of tightly packed plasmonic nanowires with a large dispersion of width and height produced by the defocused ion-beam sputtering of a thin gold film supported on a silica glass. Our results are quantitatively interpreted according to a theoretical model based on the thermomodulational nonlinearity of gold and a finite-element numerical analysis of the absorption and scattering cross-sections of the nanowires. We found that the polarization sensitivity of the metasurface can be strongly enhanced by pumping with ultrashort laser pulses, leading to potential applications in ultrafast all-optical modulation and switching of light.
引用
收藏
页数:10
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