Nonlinear optics and coherent intersubband physics of cubic GaN/Al(Ga)N heterostructures (B02)

项目B 02继续进行立方GaN/Al（Ga）N异质结构的制造及其超快和/或非线性光学特性的研究。在第二阶段，我们的目标是扩大和利用量子威尔斯阱中的近红外子带间跃迁的共振非线性。这将通过更强的掺杂和具有光谱更窄的共振的结构的生长来实现。此外，我们将研究非线性超颖表面形成的天线结构谐振子带间的过渡。这种结构大大增强了光学非线性，并使非线性光学频率混合与宽松的相位匹配条件。

Project B02 continues with the fabrication of cubic GaN/Al(Ga)N heterostructures and the investigation of their ultrafast and/or nonlinear optical properties. In the second period, we aim to enlarge and utilize the resonant nonlinearity associated with near-infrared intersubband transitions in quantum wells. This will be achieved by stronger doping and growth of structures with spectrally narrower resonances. In addition, we will investigate nonlinear metasurfaces formed by depositing antenna structures resonant to the intersubband transitions. Such structures massively enhance the optical nonlinearity and enable nonlinear optical frequency mixing with relaxed phase-matching conditions.