Experimental Verification of Epsilon-Near-Zero Metamaterial Coupling and Energy Squeezing Using a Microwave Waveguide

Lensing system and Fourier transformation using epsilon-near-zero metamaterials

“…At lower frequencies, a simple yet effective approach is based on arrangements of hollow waveguides at cutoff frequencies. 4,8 Some of the exciting features of ENZ metamaterials include the phenomenon of supercoupling, optical lumped insulator elements, and substrates for the optical displacement-current wires in metatronics. [2][3][4]8 The ENZ metamaterials have played roles in tunneling, beam forming, energy squeezing, sensing, and cloaking.…”

“…4,8 Some of the exciting features of ENZ metamaterials include the phenomenon of supercoupling, optical lumped insulator elements, and substrates for the optical displacement-current wires in metatronics. [2][3][4]8 The ENZ metamaterials have played roles in tunneling, beam forming, energy squeezing, sensing, and cloaking. [4][5][6][8][9][10][11][12] Fourier transforms are ubiquitous in modern society due to its broad utility in many branches of science and engineering, such as signal processing, antennas, imaging (e.g., magnetic resonance imaging, x rays, tomography, radar, etc.…”

Tunable waveguide bends with graphene-based anisotropic metamaterials

“…5) Meanwhile, Han and coworkers successfully designed adaptive waveguide bends with homogeneous, isotropic materials; 6) Luo et al proposed a so-called perfect bending waveguide based on realizable anisotropic epsilon-near-zero metamaterials. 7) This waveguide was experimentally verified in the microwave region by Ma et al 8) Harnessing both zero-phase variation and uniform field-distribution properties, zero-index metamaterials with deliberately engineered defects are powerful for tunneling, 9,10) total reflection or total transmission. 11,12) Recently, anisotropic zero-index metamaterials were also shown to be capable of arbitrarily manipulating the energy flux.…”

[INVITED] Epsilon-near-zero metalenses operating in the visible

“…These properties give rise to exciting phenomena such as squeezing, supercoupling and tunneling, which were first reported and experimentally demonstrated at microwave frequencies, where metals can be treated as perfect electric conductors. [4][5][6][7] By using adequate metal models, the concept of ENZ metamaterials has been scaled down to near infrared and visible wavelengths. [8][9][10] The field has matured significantly over the last years and several applications of ENZ-media have been proposed such as dielectric sensing, 11 nanocircuits, 12 Fourier transformation 13 and beamshaping.…”