Modulation transfer function measurements of microjetted microlenses.
We measured the modulation transfer function for microjetted microlenses with diameters ranging between 109 and 400 microm and with focal lengths ranging between 135 and 540 microm. We found that single-drop 109-microm-diameter microlenses perform close to their theoretical cutoff frequency. However, the larger lenses made with multiple droplets have a cutoff frequency that is 35% of the theoretical value. We interpret this as an illustration of the rapid increase in spherical aberration as the diameter of a lens increases.