Symmetry-protected zero modes in arrays of coupled optical elements have attracted considerable attention because they are expected to be robust against coupling disorders. In the Hermitian limit, zero modes are dark ones, i.e. the intensity in one sublattice vanishes; yet, in a non-Hermitian counterpart, zero modes can be bright and feature π/2 phase difference between sublattices. In this work, we report on the direct observation of a lasing zero mode in a non-Hermitian three coupled nanocavity array. We show efficient excitation for nearly equal pump power in the two extreme cavities. Furthermore, its efficiency can be dynamically controlled by pumping the center cavity. The realization of zero mode lasing in large arrays of coupled nanolasers has potential applications in laser-mode engineering and it opens up promising avenues in optical computing.
Symmetry restoration through chaotic hysteresis in a non-Hermitian optical trimer
Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas（电子结构与激光研究所，希腊研究与技术基金会）；ITCP–Department of Physics, University of Crete（克里特大学物理系）
Observation of non-Hermitian point gap in photonic crystals
Institute of Science Tokyo（科学技術大学）；Department of Physics, Institute of Science Tokyo（科学技術大学物理学科）；Institute of Industrial Science, The University of Tokyo（东京大学工业科学研究所）；NTT Basic Research Laboratories, NTT Corporation（日本电信电话株式会社基础研究中心）；Nanophotonics Center, NTT Corporation（日本电信电话株式会社纳米光子学中心）
Non-Hermitian Interaction between Light and Photonic Time Crystal Beyond the Floquet Quasinormal Mode Approximation
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所凝聚态物理国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University（北京大学物理学院介观物理国家重点实验室及纳米光电子前沿科学中心）
Non-Hermitian reconstruction of hybridized hyperbolic shear polaritons
Macao Institute of Materials Science and Engineering (MIMSE), Sino-Luso Joint Laboratory for Optoelectronics, Macau University of Science and Technology（澳门大学科学技术学院澳门科技大学中葡联合光学电子学实验室）；Macau University of Science and Technology Zhuhai MUST Science and Technology Research Institute（澳门科技大学珠海研究院）
Dynamical control of non-hermitian coupling between sub-threshold nanolasers enables Q-switched pulse generation
Technical University of Denmark（丹麦技术大学）；NanoPhoton - Center for Nanophotonics（纳米光子学中心）；Institut de Physique de Nice, CNRS, Université Côte d’Azur（尼斯物理研究所，法国国家科学研究中心，蔚蓝海岸大学）
Quasinormal mode analysis of chiral power flow from linearly polarized dipole emitters coupled to index-modulated microring resonators close to an exceptional point
