Fractal plasmonic metamaterials for subwavelength imaging

Optics Express

Volumn 18, Issue 10, 2010, Pages 10377-10387

  Huang, Xueqin ^a   Xiao, Shiyi ^a   Ye, Dexin ^b   Huangfu, Jiangtao ^b   Wang, Zhiyu ^b   Ran, Lixin ^b   Zhou, Lei ^a  

^a FUDAN UNIVERSITY   (China)

^b ZHEJIANG UNIVERSITY   (China)

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRONIC EQUIPMENT; LIGHT SOURCES; METAMATERIALS; OPTICAL DATA STORAGE; PLASMONS;

FIELD STRENGTHS; FINITE DIFFERENCE TIME-DOMAIN; FRACTAL GEOMETRY; FRACTAL PATTERNS; INFRARED FREQUENCIES; MAGNETIC SURFACES; METALLIC PLATE; MICROWAVE EXPERIMENTS; PLASMON FREQUENCY; PLASMONIC METAMATERIALS; SUB-WAVELENGTH; SUBWAVELENGTH IMAGING; SUBWAVELENGTH RESOLUTION; SYSTEM SUPPORTS;

FRACTALS;

ARTICLE; CHEMICAL MODEL; COMPUTER SIMULATION; LIGHT; MATERIALS; METHODOLOGY; RADIATION SCATTERING; SURFACE PLASMON RESONANCE;

COMPUTER SIMULATION; LIGHT; MANUFACTURED MATERIALS; MODELS, CHEMICAL; SCATTERING, RADIATION; SURFACE PLASMON RESONANCE;

EID: 77952711855     PISSN: None     EISSN: 10944087     Source Type: Journal    
DOI: 10.1364/OE.18.010377     Document Type: Article

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30. In the frequency domain of interest in this work (e.g., from microwave to infra-red), the SPP characteristics of the designed system are mainly determined by the geometry of the structure, rather than the dielectric properties of the constitutional material that we used. However, at higher frequencies (e.g. visible), material loss and dispersions play more important roles.
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34. A drawback of our tens is that it only works for sources with definite in-plane electric polarization. This problem can be remedied by replacing the fractal shape by some isotropic patterns.
35. In our experiments we only measured the one-dimensional field distributions along the line perpendicular to the antenna on the image planes.
36. CONCERTO 7.0, Vector Fields Limited, England, (2008). The basic mesh size was taken as 0.5*0.5*1 mm for microwave calculations, and 0.02*0.02*0.02 □m for infrared calculations, and finer meshes were adopted in the regions wherever necessary. Convergences of the calculations were carefully examined.
37. Here, the experimentally measured field enhancement is not obvious (about 2 times comparing with the air case). This is because the source dipole antenna adopted in experiment is too long so that the efficiency of coupling with SPP is relatively low. In addition, since the receiver antenna is also too long, the received signal actually represents an averaged field over the area covered by the antenna, and therefore, the strong local field enhancement is smeared.
38. FDTD simulations revealed that similar behaviors exist when we shift the source along y direction inside a unit cell, and the formed image consists of two peaks when the source is right at the y-direction boundary of two adjacent unit cells.
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40. The transmittance cannot reach 1 due to the material losses.