方案 科研 演示 介绍 技术

1. Terahertz Invisible Cloaking MINGYU.SHENG

4. Three kinds of “invisible cloaking” Invisible cloaking based on Transform Optics Theory Invisible cloaking based on plasma theory Invisible cloaking applied in F117 jet

6. What is THZ and its applications Photons Electrons THz Gap

7. What is THZ and its applications Collision Avoidance Personnel insertion / extraction Composite imaging Biomedical imaging Space exploration Personnel screening

9. Terahertz Invisible Cloaking

11. Theory of Transformation Optics John Pendry Imperial College David Smith Duke University A Chiral Route to Negative Refraction Science 306 1353-5 (2004) JB Pendry Controlling Electromagnetic Fields Science 312 1780-2 (2006). JB Pendry , D Schurig , and DR Smith

15. Designing Space for Light with Transformation Optics Spatial profile of  &  tensors determines the distortion of coordinate Seeking for profile of  &  to make wave avoid particular region in space — invisible cloaking Straight field line in Cartesian coordinate Distorted field line in distorted coordinate

17. Form-invariance of Maxwell’s equations

20.  (x,y,z),  (x,y,z) Original medium in the (x, y, z) space Transformed medium again in the (x, y, z) space circle-plane cloaking Coordinate transformation

21. x y z Arbitrary Shape plane cloaking

22. x y z Transformed medium/field

23.   ,   approach infinity at r=a! a b Phys. Rev. Lett. 99, 113903, 2007 Material requirement is a problem for line transformed cloak: infinity Cylindrical Cloak Ideal cylindrical cloak material parameters

27. The material parameters are simplified as Principle: Simplified cylindrical cloak in microwave

28. Min Yan, Zhichao Ruan, and Min Qiu, “Scattering characteristics of simplified cylindrical invisibility cloaks,” Opt. Express. 15, 17772, 2007. Principle: Black: ideal Green : simplified Red : improved Improving simplified cylindrical cloak  r    z

29. Linear simplified-cloak 1 Improved linear simplified-cloak (current work) Quadratic simplified-cloak 2 [1] D. Schurig, J. J. Mock, B. J. Justice, S. A. Cummer, J. B. Pendry, A. F. Starr, and D. R. Smith, “Metamaterial Electromagnetic Cloak at Microwave Frequencies,” Science 314, 977–980 (2006). Simplified cloaks

30. Employ Metamaterial: Some typical microstructures

31. Coupled split-ring resonators magnetic-dipole moments are electric-dipole moments are 2R d

32. How to map  、  ?

33. To be considered: A set of microstructures

34. Thank you