2015/05/15 by Zhiyuan Gu, Nan Zhang, Gu, Zhiyuan +9
Engineering · Physics and Astronomy · #FOS: Physical sciences #Optics (physics.optics) #Orbital Angular Momentum in Optics #Quantum Mechanics and Non-Hermitian Physics #Terahertz technology and applications #physics.optics
paper · pdf · doi:10.48550/arxiv.1505.03937
17 pages, 4 figures
arxiv created 2015/05/15 · openalex publication_date 2015/05/15 · arxiv updated 2015/05/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recently, the coexistence of parity-time (PT) symmetric laser and absorber has gained tremendous research attention. While the PT symmetric absorber has been observed in microwave metamaterials, the experimental demonstration of PT symmetric laser is still absent. Here we experimentally study PT-symmetric laser absorber in stripe waveguide. Using the concept of PT symmetry to exploit the light amplification and absorption, PT-symmetric laser absorbers have been successfully obtained. Different from the single-mode PT symmetric lasers, the PT-symmetric stripe lasers have been experimentally confirmed by comparing the relative wavelength positions and mode spacing under different pumping conditions. When the waveguide is half pumped, the mode spacing is doubled and the lasing wavelengths shift to the center of every two initial lasing modes. All these observations are consistent with the theoretical predictions and confirm the PT-symmetry breaking well.