Figure 9
From: Ultrafast lasers—reliable tools for advanced materials processing

Focal distance of a protein microlens as a function of pH. The inset SEM images show the protein microlens after change in the pH. Note: the initial radius and height of the lens (fabricated at pH 7.4) were 20 and 5 mm, respectively.86 Reproduced with permission from Wiley. ©2012 by John Wiley & Sons, Inc. SEM, scanning electron microscopy.