Saturable plasmonic metasurfaces for laser mode locking

摘要

SEM image of an 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. Optical setup for measuring the extinction spectra of NR arrays, where SCLS is a supercontinuum light source, C1 and C2 are collimators, LED is a light-emitting diode, L1, L2, and L3 are lenses, BS1 and BS2 are beam splitters, and O1 and O2 are microscope objectives. The pink and blue dashed lines represent the illumination and imaging optical paths, respectively. , Normalized experimental and simulated extinction spectra of the NR arrays with different values of L