Wang Ling-Fang, Cheng Xiao-Tian, Zhang Xiao-Dong, Yu Jia-Wang, Yan Jun-Yong, Ni Zhi-Bo, Wang Tao, Xia Ming-Jun, Lin Xing, Liu Feng, Jin Chao-Yuan
Opt Express. 2022 Mar 28;30(7):10229-10238. doi: 10.1364/OE.447759.
Photonic crystal lasers with a high-Q factor and small mode volume are ideal light sources for on-chip nano-photonic integration. Due to the submicron size of their active region, it is usually difficult to achieve high output power and single-mode lasing at the same time. In this work, we demonstrate well-selected single-mode lasing in a line-defect photonic crystal cavity by coupling it to the high-Q modes of a short double-heterostructure photonic crystal cavity. One of the FP-like modes of the line-defect cavity can be selected to lase by thermo-optically tuning the high-Q mode of the short cavity into resonance. Six FP-like modes are successively tuned into lasing with side mode suppression ratios all exceeding 15 dB. Furthermore, we show a continuous wavelength tunability of about 10 nm from all the selected modes. The coupled cavity system provides a remarkable platform to explore the rich laser physics through the spatial modulation of vacuum electromagnetic field at submicron scale.
具有高品质因数和小模式体积的光子晶体激光器是片上纳米光子集成的理想光源。由于其有源区尺寸为亚微米级，通常很难同时实现高输出功率和单模激光发射。在这项工作中，我们通过将线缺陷光子晶体腔与短双异质结构光子晶体腔的高Q模式耦合，展示了在该腔中精心选择的单模激光发射。通过热光调谐短腔的高Q模式使其共振，可以选择线缺陷腔的一种类法布里-珀罗（FP）模式进行激光发射。六个类FP模式相继被调谐到激光发射状态，边模抑制比均超过15 dB。此外，我们展示了从所有选定模式获得约10 nm的连续波长可调谐性。耦合腔系统提供了一个卓越的平台，可通过亚微米尺度真空电磁场的空间调制来探索丰富的激光物理现象。
