<p>(a) Schematic model of the shadow imaging. (b) Simulated profile of light intensity received at the sensor surface below the microcavity array. The black line indicates a profile with no cells present in the closely aligned microcavities. The red line indicates a profile with a single cell trapped on one of the closely aligned microcavities. <i>I<sub>0</sub></i> was defined as 1.0. The light through the trapped cell was assumed to be attenuated by 100%.</p