Remarkably, in this metasurface, dispersion control is successfully realized in the frequency range from 0.55 THz to 0.85 THz, that is, the focal point moves along a straight line. A monolayer of graphene is further introduced to achieve the dynamical control of the intensity of transmitted waves...
Here we introduce an active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz waves. Ultrafast modulation of polarization states and the beam splitting ratio are experimentally demonstrated on a time scale of 667 ps. This scheme of hybrid...
[23] ZHAO Y,HUANG Q,CAI H,et al.A broadband and switchable VO2-based perfect absorber at the THz frequency[J].Optics Communications,2018,426:443-449. [24] CAI H L, CHEN S,ZOU C,et al.Multifunctional hybrid metasurfaces for dynamic tuning of terahertz waves[J].Advanced Optical Material...
https://doi.org/10.1117/12.2648477Eilam Morag,Sandra Li,Anthony Kim,Sadhvikas J. Addamane, andBenjamin S. Williams "THz quantum-cascade VECSELs based upon disordered metasurfaces", Proc. SPIE 12404, V, 视频播放量 8、弹幕量 0、点赞数 0、投硬币枚数 0、收藏
New materials and mechanisms combined with THz metasurfaces are needed to achieve ultrasensitive, multidimensional (frequency, amplitude, phase) detection of biological macromolecules. Recently, graphene has attracted much interest because it presents several unique advantages: large specific surface area, ...
Using a lumped element model we can determine the dependence of the effective plasma frequency (the transition frequency) on the metasurface filling factor F. The change of the transition frequency vs. F spans over one order of magnitude and sets the threshold between the metamaterial (homogeneous...
Here we demonstrate a new kind of metasurface-based THz emitter, in which both the polarization and phase of THz waves can be finely controlled by using the concept of geometric Pancharatnam-Berry (P-B) phase, in the nonlinear optical regime. The building block of the proposed emitter is a...
Cascaded metasurfaces for dynamic control of THz wavefronts Electromagnetic (EM) waves in theterahertz(THz) regime contribute to important applications in communications, security imaging, and bio- and chemical sensing. Such wide applicability has resulted in significant technological progress. However, ...
(squared electric field, 200 GHz) of an Airy beam generated with a metasurface (see Methods). From the equation defining the free space propagation of Airy beams (see Supplementary Note5), one can extract the trajectory, a parabola expressed as\(g\left(z\right)=-{z}^{2}/(4{k}_{...