Nanorods (NRS) Metasurfaces as An Example for Laser Mode Locking (IMAGE)
Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS
Caption
(a) SEM image of a NR array with a 50 nm gap in the long axis direction (Gy) and a 300 nm gap in the short axis direction (Gx). The horizontal scale bar represents 200 nm. The inset shows a single NR from this array, which has a length (L) of 445 nm and a width (W) of 120 nm. The vertical scale bar represents 100 nm. (b) The experimental transmission (red circles) of the NR array as a function of the input power with the excitation polarization of 18° with respect to the long axis of the NR. The modulation depth Md and typical transmission Tt are defined from the corresponding fittings (blue curve). The transmission is normalized to the value of the nearby blank glass slide. (c) Experimental excitation power and polarization dependent nonlinear transmission of a NRs array. (d) The scheme of home-built ultrafast fiber laser which integrates lithographical NRs as saturable absorber, where LD represents laser diode, WDM wavelength-division multiplexing, EDF erbium-doped fiber, ISO optical isolator, PC polarization controller, C1,2 collimators and O1,2 objectives. (e) Pulse train shown on the oscilloscope in short (300 ns, lower panel) and long (10 ms, upper panel) time ranges.
Credit
by Jiyong Wang, Aurelien Coillet, Olivier Demichel, Zhiqiang Wang, Davi Rego, Alexandre Bouhelier, Philippe Grelu and Benoit Cluzel
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