Kovalchuk, Oleksiy Uddin, Siam Lee, Sungjae Song, Yong-Won 2024-01-19T16:01:11Z 2024-01-19T16:01:11Z 2022-01-10 2020-12-02 1944-8244 https://pubs.kist.re.kr/handle/201004/117695 Effective high-capacity data management necessitates the use of ultrafast fiber lasers with mode-locking-based femtosecond pulse generation. We suggest a simple but highly efficient structure of a graphene saturable absorber in the form of a graphene/poly(methyl methacrylate) (PMMA)/graphene capacitor and demonstrate the generation of ultrashort pulses by passive mode-locking in a fiber ring laser cavity, with simultaneous electrical switching (on/off) of the mode-locking operation. The voltage applied to the capacitor shifts the Fermi level of the graphene layers, thereby controlling their nonlinear light absorption, which is directly correlated with mode-locking. The flexible PMMA layer used for graphene transfer also acts as a dielectric layer to realize a very simple but effective capacitor structure. By employing the graphene capacitor on the polished surface of a D-shaped fiber, we demonstrate the switching reversibly from the femtosecond pulse regime to a continuous wave regime of the ring laser with of the mode-locking operation an extinction ratio of 70.4 dB. English American Chemical Society SATURABLE ABSORBER LAYER GRAPHENE ABSORPTION PULSES GROWTH Graphene Capacitor-Based Electrical Switching of Mode-Locking in All-Fiberized Femtosecond Lasers Article 10.1021/acsami.0c15479 1 ACS Applied Materials & Interfaces, v.12, no.48, pp.54005 - 54011 ACS Applied Materials & Interfaces 12 48 54005 54011 scie scopus 000596876400043 2-s2.0-85096471725 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article SATURABLE ABSORBER LAYER GRAPHENE ABSORPTION PULSES GROWTH graphene capacitor saturable absorber mode-locking electrical switching reversible pulse switching graphene Fermi level shift