Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light waves. In the past decade, metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional devices. Here, we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding elements. We propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding (with two phase states of 0 and 180°), 2-bit coding (with four phase states of 0, 90°, 180°, and 270°), and multi-bit coding elements in the terahertz…

• NS
  National Science Foundation

  Awards: 2011AA010202, 61138001, 2012AA030402, 61171024, BK2012019, 111-2-05, 61171026
• NN
  National Natural Science Foundation of China

  Awards: 2014CB339800, 61371035, 2011AA010202, 2012AA030402, 61171026, 111-2-05, 61171024, and 11227904, 61138001, BK2012019, 11227904
• GO
  Government of Jiangsu Province
• NS
  Natural Science Foundation of Jiangsu Province

  Awards: 2012AA030402, BK2012019, 61171026, 2011AA010202, 61138001
• HE
  Higher Education Discipline Innovation Project

  Awards: 111-2, 2011AA010202, 2012AA030402, 61138001, 111-2-05
• NK
  National Key Research and Development Program of China

  Awards: 2011AA010202, 2014CB339800, 111-2-05