Fig. 1: Light propagation in three-dimensional tumors.
From: Extreme transport of light in spheroids of tumor cells

a Sketch of multiple light scattering through a spheroid of tumor cells. The laser beam (λ = 532 nm) is phase-modulated by a spatial light modulator (SLM) and the optical intensity in the transmission plane (dashed area) is detected by a camera. b Bright-field microscopy image of a three-dimensional tumor model (3DTM) bioprinted from human pancreatic cells. The false-color image highlights high-density regions. Scale bar is 500 μm. Speckle patterns showing the spatial intensity transmitted through the millimetric volume sample c at 5 mW input power (normal waves, NWs) and d in the presence of a rogue wave (RW) at 20 mW. Scale bar is 50 μm.