Affiliation:
1. Nanjing University of Aeronautics and Astronautics
2. MIIT
3. Shandong Normal University
4. Nanjing University
Abstract
Effective integration of optical modes within chip-scale devices is critical to realize functional light emission, as it offers abundant physics and a versatile ability to control the mode evolution. Here, we present an efficient approach to achieve switchable emission by flexibly controlling supermode states in a doubly-coupled-ring system with four guided modes. The lasing conditions, which rely on the system’s Hamiltonian, are revealed to yield multiple supermode states, including an exceptional-point state, a (quasi-)dark state, and a bright state. By freely engineering the coupling rate via phase-change material, the proposed system allows the generation of any desired states, enabling switchable and multifunctional emissions in fixed on-chip structures. Beyond the manipulation of various supermode emission states, our work presents a promising path toward the development of multifunctional integrated photonic devices, which may have applications in light storage, optical isolation, sensing, and so on.
Funder
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Startup fund of NUAA
Subject
Atomic and Molecular Physics, and Optics