Enhanced magnetic Lorentz force second harmonic generation originating from a double-resonances plasmonic metasurface

Abstract

Artificial second harmonic generation (SHG) based on magnetic Lorentz force has attracted abundant attention from researchers because of the initial breakthrough in physics. It is still a challenging task to boost this type of SHG emission due to the relative lower efficiency and the specific polarization of artificial SHG. Here, we demonstrate an effective way to enhance the magnetic Lorentz force-based SHG in a double-resonances plasmonic metasurface. The design of our method is twofold: firstly, a dark resonance at fundamental frequency and a bright resonance at second harmonic frequency (SHF); secondly, polarization consistency between the bright resonance and the SHF signal. The results demonstrate that the SHF conversion efficiency of this mode-matching plasmonic metasurface can reach 1.4 × 10−9, which is enhanced by a factor of 5.17 compared to the case without the mode-matching mechanism. This high efficiency and free design of a plasmonic metasurface offer a promising way for the applications of nonlinear optics.

Numerical Simulation of the Effect of Feeding Mode on the Reduction of Ore Powder in Hydrogen‐Based Flash Ironmaking Process

“…[ 17–20 ] For another, Yang et al [ 21 ] also verified Sohn's reduction kinetic parameters for hematite concentrate powder by using a laboratory‐scale drop‐tube setup and a CFD model, confirmed the kinetic expressions accuracy again, and subsequently developed a CFD model of a new coal gasification‐flash ironmaking coupling multigeneration by drawing on both processes. [ 22 ] After that, Yang et al carried out a more comprehensive study on the new coupling process, which mainly included the coal gasification process, which matches the flash ironmaking [ 23 ] and optimization of the flash furnace type. [ 24 ] In addition, Yang et al combined experiments and CFD modeling to predict the possibility of ore powder adhering to the furnace wall [ 25 ] and improved the ore powder reduction by changing the injection angle of ore powder and using a counter‐current downer device.…”

“…Therefore, it is necessary to develop a feasible hydrogen‐based flash ironmaking process. Coal as the fuel and reductant of the flash ironmaking process has been studied, [ 22–24 ] and the construction of the coal gasification‐flash ironmaking process started in China, which will soon enter the industrialization test. However, the research on hydrogen‐based flash ironmaking has only a small amount of laboratory content and lacks the corresponding industrial‐scale research.…”

Polarization and Holography Recording in Real‐ and k‐Space Based on Dielectric Metasurface

“…Metasurfaces composed of plasmonic or dielectric nanoantennas have attracted enormous interest due to their ability to arbitrarily tailor the wavefront in ultrashort distance with subwavelength resolution and become a potential substitute for the traditional bulky optical elements. [ 1–4 ] The diverse design freedoms offered by meta‐atoms and different working mechanisms of metasurfaces motivate the manipulation of the amplitude, [ 5,6 ] phase, [ 7–9 ] polarization, [ 10–12 ] frequency, [ 13,14 ] or simultaneously multiple parameters [ 15–18 ] of output light, leading to various novel applications such as metalens, [ 19–21 ] nonlinear optics, [ 22–24 ] holography, [ 25–29 ] color printing, [ 30,31 ] as well as optical anticounterfeiting and encryption. [ 32,33 ]…”