Gao Xinyu, Zhao Guanyue, Song Mengyuan, Ao Xianyu
Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Nano Lett. 2024 Sep 4;24(35):10943-10948. doi: 10.1021/acs.nanolett.4c02836. Epub 2024 Aug 21.
This paper reports a silicon-organic hybrid lattice that can lase with vortex emission and allow all-optical control. We combine an array of amorphous silicon nanodisks with gain from dye molecules in organic solvents to generate vortex lasing from bound states in the continuum under pulsed optical pumping. Irradiating the device with an additional continuous wave green laser beam can cause optical heating in silicon and lead to negative change in the refractive index of the organic solvents; meanwhile, the green laser beam can provide additional gain. Dynamic tuning of the lasing wavelength is achieved by varying the intensity of the controlling beam. Furthermore, the vortex beam lasing can be switched to single-lobed beam lasing by moving the controlling spot to break the in-plane symmetry within the pumping spot. Our findings could shed new light on active silicon topological devices.
本文报道了一种硅有机混合晶格，它可以产生涡旋发射激光并实现全光控制。我们将非晶硅纳米盘阵列与有机溶剂中染料分子的增益相结合，在脉冲光泵浦下从连续统中的束缚态产生涡旋激光。用额外的连续波绿色激光束照射该器件会导致硅中的光热效应，并使有机溶剂的折射率产生负变化；同时，绿色激光束可以提供额外的增益。通过改变控制光束的强度实现激光波长的动态调谐。此外，通过移动控制光斑以打破泵浦光斑内的面内对称性，涡旋光束激光可以切换为单瓣光束激光。我们的发现可能为有源硅拓扑器件带来新的启示。
