[Prof. Hong-Gyu Park's Group] Vortex nanolaser based on a photonic disclination cavity
Optical vector vortex beams provide additional degrees of freedom for spatially distinguishable channels in data transmission. Although several coherent light sources carrying a topological singularity have been reported, it remains challenging to develop a general strategy for designing ultra-small, high-quality photonic nanocavities that generate and support optical vortex modes. Here we demonstrate wavelength-scale, low-threshold, vortex and anti-vortex nanolasers in a C5 symmetric optical cavity formed by a topological disclination. Various photonic disclination cavities are designed and analysed using the similarities between tight-binding models and optical simulations. Unique resonant modes are strongly confined in these cavities, which exhibit wavelength-scale mode volumes and retain topological charges in the disclination geometries. In the experiment, the optical vortices of the lasing modes are clearly identified by measuring polarization-resolved images, Stokes parameters and self-interference patterns. Demonstration of vortex nanolasers using our facile design procedure will pave the way towards next-generation optical communication systems.
Min-Soo Hwang, Ha-Reem Kim, Jungkil Kim, Bohm-Jung Yang, Yuri Kivshar & Hong-Gyu Park
(Nature Photonics, https://www.nature.com/articles/s41566-023-01338-2)
https://www.yna.co.kr/view/AKR20231127044600017?input=1195m
https://www.dongascience.com/news.php?idx=62630