Quasi-bound states in the continuum for efficient second harmonic generation and spatial phase tailoring in GaAs metasurfaces (B09*)

在这个项目中，我们的目标是在GaAs纳米谐振器的光学模式中开发连续介质中的高效准束缚态。这些模式的强场约束将被用于调整非线性光学过程产生的光的相位和发射模式，并提高新型非线性光电器件中光-物质相互作用的效率。通过使用砷化镓作为材料，我们将利用强大的二阶效应，即使在较低的功率水平下也能实现高效谐波产生和非线性全息。这种系统对于光学安全应用和非线性平面光束整形元件具有特别的意义。

In this project, we aim at exploiting highly efficient quasi-bound states in the continuum for optical modes in GaAs nanoresonators. The strong field confinement of these modes will be utilized to tailor the phase and emission patterns of light generated by nonlinear optical processes and to increase the efficiency of light-matter interaction in novel nonlinear optoelectronic devices. By using GaAs as material, we will make use of a strong second-order effect to target efficient harmonic generation and nonlinear holography even at lower power levels. Such a system would be of particular interest for optical security applications and nonlinear flat optical beam shaping elements.