A New Era for Ultrafast Photonics: Two-Dimensional Mercury-Acetylide Frameworks for Near-Infrared Nonlinear Optics (IMAGE)
Caption
(a) Schematic illustration of the Z-scan system equipped with a custom-built 1550 nm ultrafast fiber laser source. For OA operation, a focusing lens is used before the power sensor, whereas for CA operation, an aperture is employed. OA Z-scan measurement of Hg–H2TPP exhibiting (b) SA characteristics at lower intensity and (c) RSA characteristics at higher intensity. Experimental results are represented by dots, while fitting results are shown by solid lines of the same color. (d) Modulation of the β value with peak intensity, illustrating the transition from SA to RSA. (e) Variation of modulation depth and saturable intensity with respect to peak power for SA operation. Schematic illustrations of (f) saturable absorption (SA) and (g) reverse saturable absorption (RSA). VS: virtual state. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
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