1. Optical-Null Transformation Medias: Realizations and Applications
Qiong He, Shiyi Xiao, Xin Li, Kun Ding, Lei Zhou*
State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE) and Physics Department, Fudan University, Shanghai , China *
Backgrounds and Motivations
Effective Media of Holey Metallic Plate
Metamaterials and Transformation optics offer new versatility to control EM wave.
Effective k and admittance based on mode expansion theory with single mode approximation:
Bottle-neck of Transformation optics:
Difficult to realize extreme parameters (anisotropic, inhomogenous, extreme value for e and m) .
Lack of real design and real device for transformation optics.
Geometry of holey metallic plate: digged slits (blue) on metallic plate (grey)
Goals of this work:
Design and realize Optical-Null Transformation Media (ONTM)
Demonstrate experimentally some real applications of ONTM
Numerical Verification: Superlensing Effect
Stretching Operation & Optical-Null Media
FEM simulation
FDTD simulation
Image with structure
ONTM
HMP
T.O.
Media
Material's Permittivity and Permeability
Thicnkness of lens=75mm=l/2, fcutoff=2GHz.
Resolution of image is about l/2 (5mm).
By taking
Optical-Null Media
Real applications: Hyperlensing Effect of ONTM
This Media
Seems
Not Exit for light
Inspiration and Solution for ONTM
L1=1.2cm, L2=1.3cm, L3=0.6cm
Px=1.8cm, Py=3.1cm
Thickness= 6cm=l/2
Field enhancement :7
Magnification factor of image: 1.25
Image resolution: l/10 (f=2.5GHz)
Hyperlensing effect is independent of phase relation between two point sources
Possible Solution for ONTM:
Fractal-shaped Holey Metallic Plate
Conclusions
Design of transformation optics media with holey metallic plate
Effective medium theories and mode expansion theory facilitated the design process.
FEM/FDTD simulation and microwave experiments verified functionality of HMP as Optical-Null Transformation Media.
Potential applications: subwavelength imaging, bending waveguide, absorbers…
References:
[1] U. Leonhardt, Science 312, 1777 (2006); J.B. Pendry, et al., Science 312,1780 (2006).
[2] D. Schurig, et al., Science 314, 977 (2006); M. Gharghi, et al., Nano Lett. 11, 2825 (2011).
[3] X.Q. Huang, et al., OE 18, (2010); S.Y. Xiao, et al., Phys. Rev. B 85, (2012).