Abstract：

Advances in nanotechnology have enabled the realization of semiconductor lasers with subwavelength resonant cavities. These nanoscale lasers feature not only extremely compact dimensions but also the potential for ultralow energy consumption, opening new possibilities for information technologies such as on-chip optical communication and optical computing. Such developments are increasingly important as the rapid rise of artificial intelligence continues to drive unprecedented demand for computing power and energy efficiency.

From a physical standpoint, as the characteristic dimensions of lasers shrink to the nanoscale, many assumptions that traditionally apply to macroscopic semiconductor lasers must be revisited. In this talk, I will present our recent progress in the study of semiconductor micro- and nanolasers, focusing on three key directions: ultralow-threshold photonic-crystal microcavity lasers, semiconductor lasers with deeply subwavelength optical confinement, and semiconductor Fano lasers.

Bio:

Yi Yu received his B.Sc. and M.Eng. degrees from Huazhong University of Science and Technology, Wuhan, China, in 2008 and 2011, respectively, and his Ph.D. from the Technical University of Denmark (DTU) in 2015. He has worked as a postdoctoral researcher at DTU Electro and at the Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland (2018–2020). Since 2020, he has been a Senior Researcher (Associate Professor) at DTU Electro. His research focuses on nanophotonics, lasers, and quantum optics, targeting applications in high-density on-chip optoelectronic communication and computing.