Designer Surface Plasmons Enable Terahertz Cherenkov Radiation (Invited)

Abstract

Cherenkov radiation (CR) is a promising method to generate high-power terahertz (THz) electromagnetic (EM) waves, which are highly desired in numerous practical applications. For the purpose of economy energy, naturally occurred materials with flat surface (e.g., graphene), which can support highly-confined surface-plasmon-polariton (SPP) modes, have been proposed to construct high-efficiency terahertz CR source; however, these emerging materials cannot be easily fabricated nor flexibly designed. Here, we propose a designer-SPP metamaterial scheme to pursue terahertz CR. The metamaterial is a structure-decorated metal surface, which is compatible with planar fabrication and can support SPP-like EM modes in terahertz frequencies, also named as designer SPP. Due to the structure dependence of designer SPP, its dispersions can be flexibly designed by changing the structure geometries as well as choosing proper dielectric medias. Numerical results clearly demonstrated this scheme. Our proposal may promise future high-efficiency and intense THz source with design flexibilities.

Photonic Topological Valley-Locked Waveguides

“…The proposed TVLW has found some unique applications, such as high-energy-capacity topological channel intersections, valley-locked energy concentrators, and topological cavities with tailorable mode confinement, which are enabled by the mode width DOF. Besides, in comparison to the previous domain wall structures, the TVLW is more flexible to interface with the existing photonic waveguides and devices. , Finally, it would be interesting to experimentally investigate the photonic TVLW at higher frequencies, such as terahertz, infrared, and optical frequencies, and study its practical use of topological lasing, field enhancement, on-chip communication, and high-capacity energy transport.…”

“…Besides, in comparison to the previous domain wall structures, the TVLW is more flexible to interface with the existing photonic waveguides and devices. 37,38 Finally, it would be interesting to experimentally investigate the photonic TVLW at higher frequencies, such as terahertz, infrared, and optical frequencies, and study its practical use of topological lasing, 39 field enhancement, on-chip communication, and high-capacity energy transport.…”

Micro-/Nano-Structures Fabricated by Laser Technologies for Optoelectronic Devices

“…As a result, the existence of micro-/nano-structures can improve the light absorption capacity of the optoelectronic device. Moreover, the efficiency of optoelectronic devices can be enhanced by surface plasmon-polariton ( Eaton et al, 2016 ; Li et al, 2020b ; Zhang et al, 2020b ).…”

Electromagnetic Response of Clustered Charged Particles

“…where c s β s /m s . Since K η s u τ , where η s is the density of charge, from (Eqs 6, 8), we have (Bohren and Hunt, 1977;Kocifaj, 2013;Klačka et al, 2015b;Holloway et al, 2019;zhang et al, 2020),…”