Ultrathin Nonlinear Metasurface for Optical Image Encoding

Walter, Felicitas1; Li, Guixin2; Meier, Cedrik1; Zhang, Shuang3; Zentgraf, Thomas1

2017-05

10.1021/acs.nanolett.7b00676

NANO LETTERS   影响因子和分区

1530-6984

1530-6992

Security of optical information is of great importance in modern society. Many cryptography techniques based on classical and quantum optics have been widely explored in the linear optical regime. Nonlinear optical encryption in which encoding and decoding involve nonlinear frequency conversions represents a new strategy for securing optical information. Here, we demonstrate that an ultrathin nonlinear photonic metasurface, consisting of meta-atoms with 3-fold rotational symmetry, can be used to hide optical images under illumination with a fundamental wave. However, the hidden image can be read out from second harmonic generation (SHG) waves. This is achieved by controlling the destructive and constructive interferences of SHG waves from two neighboring meta-atoms. In addition, we apply this concept to obtain gray scale SHG imaging. Nonlinear metasurfaces based on space variant optical interference open new avenues for multilevel image encryption, anticounterfeiting, and background free image reconstruction.

Metasurface plasmonics nonlinear second harmonic generation Pacharatman-Berry-phase

SCI ; EI

英语

NI期刊

通讯

DFG Research Center TRR142 "Tailored nonlinear photonics"[TRR142/A05]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000401307300063

AMER CHEMICAL SOC

20172003677543

Cryptography ; Encoding (symbols) ; Geometrical optics ; Harmonic generation ; Image reconstruction ; Metamaterials ; Plasmonics ; Quantum optics ; Signal encoding

Information Theory and Signal Processing:716.1 ; Data Processing and Image Processing:723.2 ; Light/Optics:741.1 ; Nonlinear Optics:741.1.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Univ Paderborn, Dept Phys, Warburger Str 100, D-33098 Paderborn, Germany
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, 1088 Xueyuan Ave, Shenzhen 518055, Peoples R China
3.Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

Walter, Felicitas,Li, Guixin,Meier, Cedrik,et al. Ultrathin Nonlinear Metasurface for Optical Image Encoding[J]. NANO LETTERS,2017,17(5):3171-3175.

Walter, Felicitas,Li, Guixin,Meier, Cedrik,Zhang, Shuang,&Zentgraf, Thomas.(2017).Ultrathin Nonlinear Metasurface for Optical Image Encoding.NANO LETTERS,17(5),3171-3175.

Walter, Felicitas,et al."Ultrathin Nonlinear Metasurface for Optical Image Encoding".NANO LETTERS 17.5(2017):3171-3175.