“…4,5,11 Furthermore, the measurement of the geometric shape of droplets is substantial in applications, such as the spreading of droplets, 4,5 the evaporation/condensation of sessile droplets, [12][13][14] microfluidics, 15 inkjet printing, 10 and microlens array. 16 There have been various methods for droplet profile measurement, such as the droplet height or thickness, and the contact angle, based on goniometry, 17 interferometry, 6,8,[18][19][20][21][22][23][24] total internal reflection microscopy (TIR), 25,26 atomic force microscopy (AFM), [27][28][29] ellipsometry, 30 and optical microscopy. 31,32 The interferometry, AFM, and ellipsometry can measure the droplet profile on a nanometer to sub-micrometer scale, enabling the profile determination in the intermediate region of the droplet.…”