Z-scan is a technique used in spectroscopy to investigate non-linear optical properties, particularly in mesoscopic systems. The discussion highlights the need for clarity in terminology, as initial questions about z-scan were vague. A comprehensive overview of z-scan, including its transmission curves, can be found in a referenced paper. The technique is currently an active area of research, prompting further exploration and questions. For those interested, reviewing the linked paper may provide valuable insights into z-scan.